168 relations: Abdomen, Abdominal aorta, Abdominal internal oblique muscle, Abdominal wall, Activin and inhibin, Agnatha, Air sac, Amniote, Amphibian, Anabolic steroid, Androgen, Animal, Anorchia, Anterior pituitary, Antigen, Aristotle, Armadillo, Artery to the ductus deferens, Autoimmunity, Blood–testis barrier, Blue balls, Bollocks, Boreoeutheria, Castration, Cell (biology), Cetacea, Chemical castration, Chimpanzee, Cilium, Cremaster muscle, Cremasteric artery, Cremasteric reflex, Cryptorchidism, Deer, DNA damage (naturally occurring), DNA polymerase beta, Efferent ducts, Ejaculation, Elephant, Ellipsoid, Endocrine disease, Epididymis, Epididymitis, Epithelium, Erection, Estrogen, Estrous cycle, Eunuch, External iliac artery, Extracellular fluid, ..., Fallopian tube, Female promiscuity, Flagellum, Follicle-stimulating hormone, Gamete, Gelding, Gender dysphoria, Gene expression, Germ cell, Germline mutation, Gland, Golden jackal, Gonad, Gonadotropin, Gorilla, Hamster, Hominidae, Homology (biology), Hormone therapy, Horse, Human genome, Human sexual activity, Hydrocele testis, Inferior epigastric artery, Inferior vesical artery, Infertility, Inguinal canal, Inguinal lymph nodes, Intermediate mesoderm, Internal iliac artery, Internal pudendal artery, Jockstrap, Kangaroo, Latin, Levator ani, Leydig cell, Libido, List of related male and female reproductive organs, Luteinizing hormone, Lymphatic system, Macrophage, Male, Marsupial, Mating system, Mediastinum testis, Mesonephric duct, Monotreme, Neoplasm, Neutering, Orchidometer, Orchiopexy, Orchitis, Ovary, Pampiniform venous plexus, Paraaortic lymph nodes, Paramesonephric duct, Penis, Perineum, Peritubular myoid cell, Polygamy, Polyorchidism, Preterm birth, Prostate, Protamine, Puberty, Recombinase, Reproduction, Rete testis, Right whale, Rocky Mountain oysters, Roman law, Scrotum, Seasonal breeder, Secondary sex characteristic, Seminiferous tubule, Sensitivity and specificity, Sertoli cell, Sex cords, Sexual arousal, Shark, Skeletal muscle, Sloth, Sperm, Sperm competition, Spermatic cord, Spermatic plexus, Spermatid, Spermatocele, Spermatocyte, Spermatogenesis, Spermatogonium, Spermatozoon, Sterilization (medicine), Steroid, Teleost, Temperature, Testicle, Testicles as food, Testicondy, Testicular artery, Testicular cancer, Testicular prostheses, Testicular rupture, Testicular self-examination, Testicular torsion, Testicular vein, Testis-determining factor, Testosterone, The American Heritage Dictionary of the English Language, Tight junction, Tunica albuginea of testis, Ultrasound, Urethra, Urinary meatus, Varicocele, Vas deferens, Vasectomy, Wiktionary. Expand index (118 more) » « Shrink index
The abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates.
The abdominal aorta is the largest artery in the abdominal cavity.
The internal oblique muscle is a muscle in the abdominal wall that lies below the external oblique and just above the transverse abdominal muscles.
In anatomy, the abdominal wall represents the boundaries of the abdominal cavity.
Activin and inhibin are two closely related protein complexes that have almost directly opposite biological effects.
Agnatha (Greek, "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species.
Air sacs are spaces within an organism where there is the constant presence of air.
Amniotes (from Greek ἀμνίον amnion, "membrane surrounding the fetus", earlier "bowl in which the blood of sacrificed animals was caught", from ἀμνός amnos, "lamb") are a clade of tetrapod vertebrates comprising the reptiles, birds, and mammals.
Amphibians are ectothermic, tetrapod vertebrates of the class Amphibia.
Anabolic steroids, also known more properly as anabolic–androgenic steroids (AAS), are steroidal androgens that include natural androgens like testosterone as well as synthetic androgens that are structurally related and have similar effects to testosterone.
An androgen (from Greek andr-, the stem of the word meaning "man") is any natural or synthetic steroid hormone which regulates the development and maintenance of male characteristics in vertebrates by binding to androgen receptors.
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia.
Anorchia (also called anorchidism or anorchism) is a disorder of sex development in which a person with XY karyotype, which usually corresponds to male sex, is born without testes.
A major organ of the endocrine system, the anterior pituitary (also called the adenohypophysis or pars anterior), is the glandular, anterior lobe that together with the posterior lobe (posterior pituitary, or the neurohypophysis) makes up the pituitary gland (hypophysis).
In immunology, an antigen is a molecule capable of inducing an immune response (to produce an antibody) in the host organism.
Aristotle (Ἀριστοτέλης Aristotélēs,; 384–322 BC) was an ancient Greek philosopher and scientist born in the city of Stagira, Chalkidiki, in the north of Classical Greece.
Armadillos are New World placental mammals in the order Cingulata with a leathery armour shell.
The artery to the ductus deferens (deferential artery) is an artery in males that provides blood to the ductus deferens.
Autoimmunity is the system of immune responses of an organism against its own healthy cells and tissues.
The blood–testis barrier is a physical barrier between the blood vessels and the seminiferous tubules of the animal testes.
Blue balls is a slang term for the condition of temporary fluid congestion (vasocongestion) in the testicles accompanied by testicular pain, caused by prolonged sexual arousal in the human male without ejaculation.
"Bollocks" is a word of Middle English origin, meaning "testicles".
Boreoeutheria (synonymous with Boreotheria) (Greek: βόρειο "north" + ευ "good" + θεριό "beast") is a clade (magnorder) of placental mammals that is composed of the sister taxa Laurasiatheria (most hoofed mammals, most pawed carnivores, and several other groups) and Euarchontoglires (Supraprimates).
Castration (also known as gonadectomy) is any action, surgical, chemical, or otherwise, by which an individual loses use of the testicles.
The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms.
Cetacea are a widely distributed and diverse clade of aquatic mammals that today consists of the whales, dolphins, and porpoises.
Chemical castration is castration via anaphrodisiac drugs, whether to reduce libido and sexual activity, to treat cancer, or otherwise.
The taxonomical genus Pan (often referred to as chimpanzees or chimps) consists of two extant species: the common chimpanzee and the bonobo.
A cilium (the plural is cilia) is an organelle found in eukaryotic cells.
The cremaster muscle is a muscle that covers the testis and the spermatic cord.
The cremasteric artery (external spermatic artery) is a branch of the inferior epigastric artery which accompanies the spermatic cord, and supplies the Cremaster and other coverings of the cord, anastomosing with the testicular artery (internal spermatic artery in older texts).
The cremasteric reflex is a superficial (i.e., close to the skin's surface) reflex observed in human males.
Cryptorchidism is the absence of one or both testes from the scrotum.
Deer (singular and plural) are the ruminant mammals forming the family Cervidae.
DNA damage is distinctly different from mutation, although both are types of error in DNA.
DNA polymerase, beta, also known as POLB, is an enzyme present in eukaryotes.
The efferent ducts (or efferent ductules or ductuli efferentes or ductus efferentes or vasa efferentia) connect the rete testis with the initial section of the epididymis.
Ejaculation is the discharge of semen (normally containing sperm) from the male reproductory tract, usually accompanied by orgasm.
Elephants are large mammals of the family Elephantidae and the order Proboscidea.
An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation.
Endocrine diseases are disorders of the endocrine system.
The epididymis (plural: epididymides or) is a tube that connects a testicle to a vas deferens in the male reproductive system.
Epididymitis is a medical condition characterized by inflammation of the epididymis, a curved structure at the back of the testicle.
Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue.
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged.
Estrogen, or oestrogen, is the primary female sex hormone.
The estrous cycle or oestrus cycle (derived from Latin oestrus 'frenzy', originally from Greek οἶστρος oîstros 'gadfly') is the recurring physiological changes that are induced by reproductive hormones in most mammalian therian females.
The term eunuch (εὐνοῦχος) generally refers to a man who has been castrated, typically early enough in his life for this change to have major hormonal consequences.
The external iliac arteries are two major arteries which bifurcate off the common iliac arteries anterior to the sacroiliac joint of the pelvis.
Extracellular fluid (ECF) denotes all body fluid outside the cells.
The Fallopian tubes, also known as uterine tubes or salpinges (singular salpinx), are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus, via the uterotubal junction.
Promiscuity tends to be frowned upon by many societies, expecting most members to have committed, long-term relationships with single partners.
A flagellum (plural: flagella) is a lash-like appendage that protrudes from the cell body of certain bacterial and eukaryotic cells.
Follicle-stimulating hormone (FSH) is a gonadotropin, a glycoprotein polypeptide hormone.
A gamete (from Ancient Greek γαμετή gamete from gamein "to marry") is a haploid cell that fuses with another haploid cell during fertilization (conception) in organisms that sexually reproduce.
A gelding is a castrated horse or other equine, such as a donkey or a mule.
Gender dysphoria (GD), or gender identity disorder (GID), is the distress a person experiences as a result of the sex and gender they were assigned at birth.
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product.
A germ cell is any biological cell that gives rise to the gametes of an organism that reproduces sexually.
A germline mutation, or germinal mutation, is any detectable variation within germ cells (cells that, when fully developed, become sperm and ovum).
A gland is a group of cells in an animal's body that synthesizes substances (such as hormones) for release into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).
The golden jackal (Canis aureus) is a wolf-like canid that is native to Southeast Europe, Southwest Asia, South Asia, and regions of Southeast Asia.
A gonad or sex gland or reproductive gland is a mixed gland that produces the gametes (sex cells) and sex hormones of an organism.
Gonadotropins are glycoprotein polypeptide hormones secreted by gonadotrope cells of the anterior pituitary of vertebrates.
Gorillas are ground-dwelling, predominantly herbivorous apes that inhabit the forests of central Sub-Saharan Africa.
Hamsters are rodents (order Rodentia) belonging to the subfamily Cricetinae, which contains about 25 species classified in six or seven genera.
The Hominidae, whose members are known as great apes or hominids, are a taxonomic family of primates that includes eight extant species in four genera: Pongo, the Bornean, Sumatran and Tapanuli orangutan; Gorilla, the eastern and western gorilla; Pan, the common chimpanzee and the bonobo; and Homo, which includes modern humans and its extinct relatives (e.g., the Neanderthal), and ancestors, such as Homo erectus.
In biology, homology is the existence of shared ancestry between a pair of structures, or genes, in different taxa.
Hormone therapy or hormonal therapy is the use of hormones in medical treatment.
The horse (Equus ferus caballus) is one of two extant subspecies of ''Equus ferus''.
The human genome is the complete set of nucleic acid sequences for humans, encoded as DNA within the 23 chromosome pairs in cell nuclei and in a small DNA molecule found within individual mitochondria.
Human sexual activity, human sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality.
A hydrocele testis is an accumulation of clear fluid in the tunica vaginalis, the most internal of membranes containing a testicle.
In human anatomy, inferior epigastric artery refers to the artery that arises from the external iliac artery and anastomoses with the superior epigastric artery.
The inferior vesical artery is an artery in the pelvis that supplies the lower part of the bladder.
Infertility is the inability of a person, animal or plant to reproduce by natural means.
The inguinal canals are the two passages in the anterior abdominal wall which in males convey the spermatic cords and in females the round ligament of uterus.
Inguinal lymph nodes are the lymph nodes in the inguinal region (groin).
Intermediate mesenchyme or intermediate mesoderm is a type of mesoderm (an embryological tissue) that is located between the paraxial mesoderm and the lateral plate.
The internal iliac artery (formerly known as the hypogastric artery) is the main artery of the pelvis.
The internal pudendal artery is one of the three pudendal arteries that branches off the internal iliac artery, providing blood to the external genitalia.
A jockstrap (also known as a jock, strap, supporter, or athletic supporter) is an undergarment for supporting the male genitalia during cycling, contact sports or other vigorous physical activity.
The kangaroo is a marsupial from the family Macropodidae (macropods, meaning "large foot").
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
The levator ani is a broad, thin muscle, situated on either side of the pelvis.
Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle.
Libido, colloquially known as sex drive, is a person's overall sexual drive or desire for sexual activity.
This list of related male and female reproductive organs shows how the male and female reproductive organs of the human reproductive system are related, sharing a common developmental path.
Luteinizing hormone (LH, also known as lutropin and sometimes lutrophin) is a hormone produced by gonadotropic cells in the anterior pituitary gland.
The lymphatic system is part of the vascular system and an important part of the immune system, comprising a network of lymphatic vessels that carry a clear fluid called lymph (from Latin, lympha meaning "water") directionally towards the heart.
Macrophages (big eaters, from Greek μακρός (makrós).
A male (♂) organism is the physiological sex that produces sperm.
Marsupials are any members of the mammalian infraclass Marsupialia.
A mating system is a way in which a group is structured in relation to sexual behaviour.
The mediastinum testis is a network of fibrous connective tissue that extends from the top to near the bottom of each testis.
The mesonephric duct (also known as the Wolffian duct, archinephric duct, Leydig's duct or nephric duct) is a paired organ found in mammals including humans during embryogenesis.
Monotremes are one of the three main groups of living mammals, along with placentals (Eutheria) and marsupials (Metatheria).
Neoplasia is a type of abnormal and excessive growth of tissue.
Neutering, from the Latin neuter ('of neither sex'), is the removal of an animal's reproductive organ, either all of it or a considerably large part.
An orchidometer (or orchiometer) is a medical instrument used to measure the volume of the testicles.
Orchiopexy (or orchidopexy) is a surgery to move an undescended (cryptorchid) testicle into the scrotum and permanently fix it there.
Orchitis or orchiditis (from the Ancient Greek ὄρχις meaning "testicle"; same root as orchid) is inflammation of the testes.
The ovary is an organ found in the female reproductive system that produces an ovum.
The pampiniform plexus (from Latin pampinus, a tendril, + forma, form) is a network of many small veins found in the human male spermatic cord and to a lesser extent the suspensory ligament of the ovary.
The paraaortic lymph nodes (also known as periaortic, and lumbar) are a group of lymph nodes that lie in front of the lumbar vertebrae near the aorta.
Paramesonephric ducts (or Müllerian ducts) are paired ducts of the embryo that run down the lateral sides of the urogenital ridge and terminate at the sinus tubercle in the primitive urogenital sinus.
A penis (plural penises or penes) is the primary sexual organ that male animals use to inseminate sexually receptive mates (usually females and hermaphrodites) during copulation.
The perineum is the space between the anus and scrotum in the male and between the anus and the vulva in the female.
A peritubular myoid (PTM) cell is one of the smooth muscle cells which surround the seminiferous tubules in the testis.
Polygamy (from Late Greek πολυγαμία, polygamía, "state of marriage to many spouses") is the practice of marrying multiple spouses.
Polyorchidism is the incidence of more than two testicles.
Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age.
The prostate (from Ancient Greek προστάτης, prostates, literally "one who stands before", "protector", "guardian") is a compound tubuloalveolar exocrine gland of the male reproductive system in most mammals.
Protamines are small, arginine-rich, nuclear proteins that replace histones late in the haploid phase of spermatogenesis and are believed essential for sperm head condensation and DNA stabilization.
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction.
Recombinases are genetic recombination enzymes.
Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents".
The rete testis is an anastomosing network of delicate tubules located in the hilum of the testicle (mediastinum testis) that carries sperm from the seminiferous tubules to the efferent ducts.
Right whales or black whales are three species of large baleen whales of the genus Eubalaena: the North Atlantic right whale (E. glacialis), the North Pacific right whale (E. japonica) and the Southern right whale (E. australis).
Rocky Mountain oysters, also known as prairie oysters in Canada, also calf fries, is a dish made of cattle testicles.
Roman law is the legal system of ancient Rome, including the legal developments spanning over a thousand years of jurisprudence, from the Twelve Tables (c. 449 BC), to the Corpus Juris Civilis (AD 529) ordered by Eastern Roman Emperor Justinian I. Roman law forms the basic framework for civil law, the most widely used legal system today, and the terms are sometimes used synonymously.
The scrotum is an anatomical male reproductive structure that consists of a suspended dual-chambered sack of skin and smooth muscle that is present in most terrestrial male mammals and located under the penis.
Seasonal breeders are animal species that successfully mate only during certain times of the year.
Secondary sex characteristics are features that appear during puberty in humans, and at sexual maturity in other animals.
Seminiferous tubules are located within the testes, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa.
Sensitivity and specificity are statistical measures of the performance of a binary classification test, also known in statistics as a classification function.
A Sertoli cell (a kind of sustentacular cell) is a "nurse" cell of the testicles that is part of a seminiferous tubule and helps in the process of spermatogenesis, the production of sperm.
In embryogenesis, the sex cords, (primitive sex cords or gonadal cords) are structures that develop from the gonadal ridges.
Sexual arousal (also sexual excitement) is the arousal of sexual desire, during or in anticipation of sexual activity.
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.
Skeletal muscle is one of three major muscle types, the others being cardiac muscle and smooth muscle.
Sloths are arboreal mammals noted for slowness of movement and for spending most of their lives hanging upside down in the trees of the tropical rainforests of South America and Central America.
Sperm is the male reproductive cell and is derived from the Greek word (σπέρμα) sperma (meaning "seed").
Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction.
The spermatic cord is the cord-like structure in males formed by the vas deferens (ductus deferens) and surrounding tissue that runs from the deep inguinal ring down to each testicle.
The spermatic plexus (or testicular plexus) is derived from the renal plexus, receiving branches from the aortic plexus.
The spermatid is the haploid male gametid that results from division of secondary spermatocytes.
Spermatocele is a retention cyst of a tubule of the rete testis or the head of the epididymis distended with barely watery fluid that contains spermatozoa.
Spermatocytes are a type of male gametocyte in animals.
Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis.
A spermatogonium (plural: spermatogonia) is an undifferentiated male germ cell.
A spermatozoon (pronounced, alternate spelling spermatozoön; plural spermatozoa; from σπέρμα "seed" and ζῷον "living being") is a motile sperm cell, or moving form of the haploid cell that is the male gamete.
Sterilization (also spelled sterilisation) is any of a number of medical techniques that intentionally leaves a person unable to reproduce.
A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration.
The teleosts or Teleostei (Greek: teleios, "complete" + osteon, "bone") are by far the largest infraclass in the class Actinopterygii, the ray-finned fishes, and make up 96% of all extant species of fish.
Temperature is a physical quantity expressing hot and cold.
The testicle or testis is the male reproductive gland in all animals, including humans.
The testicles of calves, lambs, roosters, turkeys, and other animals are eaten in many parts of the world, often under euphemistic culinary names.
In biology, testicondy in a species is the condition of having testicles situated within the abdomen as the normal anatomy of that species.
The testicular artery (the male gonadal artery, also called the internal spermatic arteries in older texts) is a branch of the abdominal aorta that supplies blood to the testis.
Testicular cancer is cancer that develops in the testicles, a part of the male reproductive system.
Testicular prostheses are plastic ovoids implanted in the scrotum.
Testicular rupture is a rip or tear in the tunica albuginea resulting in extrusion of the testicular contents, including the seminiferous tubules.
Testicular self-examination is a medical practice by which external feeling of the testicles can act as a first-warning for testicular cancer.
Testicular torsion occurs when the spermatic cord (from which the testicle is suspended) twists, cutting off the testicle's blood supply.
The testicular vein (or spermatic vein), the male gonadal vein, carries deoxygenated blood from its corresponding testis to the inferior vena cava or one of its tributaries.
Testis-determining factor (TDF), also known as sex-determining region Y (SRY) protein, is a DNA-binding protein (also known as gene-regulatory protein/transcription factor) encoded by the SRY gene that is responsible for the initiation of male sex determination in humans.
Testosterone is the primary male sex hormone and an anabolic steroid.
The American Heritage Dictionary of the English Language (AHD) is an American dictionary of English published by Boston publisher Houghton Mifflin, the first edition of which appeared in 1969.
Tight junctions, also known as occluding junctions or zonulae occludentes (singular, zonula occludens) are multiprotein junctional complex whose general function is to prevent leakage of transported solutes and water and seals the paracellular pathway.
The tunica albuginea is the fibrous covering of the testis.
Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing.
In anatomy, the urethra (from Greek οὐρήθρα – ourḗthrā) is a tube that connects the urinary bladder to the urinary meatus for the removal of urine from the body.
The urinary meatus, also known as the external urethral orifice, is the opening or meatus of the urethra.
A varicocele is an abnormal enlargement of the pampiniform venous plexus in the scrotum.
The vas deferens (Latin: "carrying-away vessel"; plural: vasa deferentia), also called ductus deferens (Latin: "carrying-away duct"; plural: ductus deferentes), is part of the male reproductive system of many vertebrates; these vasa transport sperm from the epididymis to the ejaculatory ducts in anticipation of ejaculation.
Vasectomy is a surgical procedure for male sterilization or permanent contraception.
Wiktionary is a multilingual, web-based project to create a free content dictionary of all words in all languages.
Balls (slang), Low hangers, Orchitic, Teste, Testes, Testical, Testical cyst, Testicals, Testicle size, Testicles, Testicular, Testicular disease, Testicular diseases, Testicular disorder, Testicular hormones, Testicular size, Testiculus, Testis.