Get it on Google Play
New! Download Unionpedia on your Android™ device!
Faster access than browser!

Photoreceptor cell

Index Photoreceptor cell

A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. [1]

107 relations: Absorbance, Action potential, Adenosine triphosphate, Amacrine cell, Axon, Bipolar neuron, Blind spot (vision), Brain, Calcium, Cell (biology), Cell membrane, Chemical synapse, Cilium, Circadian rhythm, Cofactor (biochemistry), Color, Color vision, Cone cell, Consciousness, Contrast (vision), Cyclic guanosine monophosphate, Depolarization, Diurnality, Edge detection, Electric current, Electrochemical gradient, Electromagnetic radiation, Enzyme, Eric Kandel, Fovea centralis, G protein, G protein–coupled receptor, Glutamic acid, Human, Hyperpolarization (biology), Insect, Intrinsically photosensitive retinal ganglion cells, Ion, Ion channel, Lateral geniculate nucleus, Ligand-gated ion channel, Light, Luminous intensity, Macular degeneration, Melanopsin, Membrane potential, Mesopic vision, Metabotropic receptor, Mitochondrion, Mollusca, ..., Na+/K+-ATPase, Neuroepithelial cell, Neuronal noise, Neuroscience Information Framework, Neurotransmitter, Nocturnality, Notch signaling pathway, Nyctalopia, Opponent process, Opsin, Optic nerve, Optical resolution, Organelle, Phosphodiesterase, Photon, Photopic vision, Photopsin, Photoreceptor protein, Photosensitivity, Pigment, Pituitary adenylate cyclase-activating peptide, Pretectal area, Principles of Neural Science, Pupillary light reflex, Pupillary reflex, Receptive field, Receptor (biochemistry), Resting potential, Retina, Retina bipolar cell, Retina horizontal cell, Retinal, Retinal ganglion cell, Retinal mosaic, Retinitis pigmentosa, Retinohypothalamic tract, Rhodopsin, Rod cell, Schiff base, Scotopic vision, Sensory nervous system, Signal transduction, Simple eye in invertebrates, Sodium, Sodium channel, Soma (biology), Stimulus (physiology), Suprachiasmatic nucleus, Tawny owl, Transducin, Trichromacy, Visual acuity, Visual impairment, Visual perception, Visual phototransduction, Visual system, Wavelength. Expand index (57 more) »


In chemistry, absorbance or decadic absorbance is the common logarithm of the ratio of incident to transmitted radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to transmitted spectral radiant power through a material.

New!!: Photoreceptor cell and Absorbance · See more »

Action potential

In physiology, an action potential occurs when the membrane potential of a specific axon location rapidly rises and falls: this depolarisation then causes adjacent locations to similarly depolarise.

New!!: Photoreceptor cell and Action potential · See more »

Adenosine triphosphate

Adenosine triphosphate (ATP) is a complex organic chemical that participates in many processes.

New!!: Photoreceptor cell and Adenosine triphosphate · See more »

Amacrine cell

Amacrine cells are interneurons in the retina.

New!!: Photoreceptor cell and Amacrine cell · See more »


An axon (from Greek ἄξων áxōn, axis) or nerve fiber, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses known as action potentials, away from the nerve cell body.

New!!: Photoreceptor cell and Axon · See more »

Bipolar neuron

A bipolar neuron or bipolar cell, is a type of neuron which has two extensions.

New!!: Photoreceptor cell and Bipolar neuron · See more »

Blind spot (vision)

A blind spot, scotoma, is an obscurity of the visual field.

New!!: Photoreceptor cell and Blind spot (vision) · See more »


The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.

New!!: Photoreceptor cell and Brain · See more »


Calcium is a chemical element with symbol Ca and atomic number 20.

New!!: Photoreceptor cell and Calcium · See more »

Cell (biology)

The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms.

New!!: Photoreceptor cell and Cell (biology) · See more »

Cell membrane

The cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space).

New!!: Photoreceptor cell and Cell membrane · See more »

Chemical synapse

Chemical synapses are biological junctions through which neurons' signals can be exchanged to each other and to non-neuronal cells such as those in muscles or glands.

New!!: Photoreceptor cell and Chemical synapse · See more »


A cilium (the plural is cilia) is an organelle found in eukaryotic cells.

New!!: Photoreceptor cell and Cilium · See more »

Circadian rhythm

A circadian rhythm is any biological process that displays an endogenous, entrainable oscillation of about 24 hours.

New!!: Photoreceptor cell and Circadian rhythm · See more »

Cofactor (biochemistry)

A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity.

New!!: Photoreceptor cell and Cofactor (biochemistry) · See more »


Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.

New!!: Photoreceptor cell and Color · See more »

Color vision

Color vision is the ability of an organism or machine to distinguish objects based on the wavelengths (or frequencies) of the light they reflect, emit, or transmit.

New!!: Photoreceptor cell and Color vision · See more »

Cone cell

Cone cells, or cones, are one of three types of photoreceptor cells in the retina of mammalian eyes (e.g. the human eye).

New!!: Photoreceptor cell and Cone cell · See more »


Consciousness is the state or quality of awareness, or, of being aware of an external object or something within oneself.

New!!: Photoreceptor cell and Consciousness · See more »

Contrast (vision)

Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable.

New!!: Photoreceptor cell and Contrast (vision) · See more »

Cyclic guanosine monophosphate

Cyclic guanosine monophosphate (cGMP) is a cyclic nucleotide derived from guanosine triphosphate (GTP).

New!!: Photoreceptor cell and Cyclic guanosine monophosphate · See more »


In biology, depolarization is a change within a cell, during which the cell undergoes a shift in electric charge distribution, resulting in less negative charge inside the cell.

New!!: Photoreceptor cell and Depolarization · See more »


Diurnality is a form of plant or animal behavior characterized by activity during the day, with a period of sleeping, or other inactivity, at night.

New!!: Photoreceptor cell and Diurnality · See more »

Edge detection

Edge detection includes a variety of mathematical methods that aim at identifying points in a digital image at which the image brightness changes sharply or, more formally, has discontinuities.

New!!: Photoreceptor cell and Edge detection · See more »

Electric current

An electric current is a flow of electric charge.

New!!: Photoreceptor cell and Electric current · See more »

Electrochemical gradient

An electrochemical gradient is a gradient of electrochemical potential, usually for an ion that can move across a membrane.

New!!: Photoreceptor cell and Electrochemical gradient · See more »

Electromagnetic radiation

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.

New!!: Photoreceptor cell and Electromagnetic radiation · See more »


Enzymes are macromolecular biological catalysts.

New!!: Photoreceptor cell and Enzyme · See more »

Eric Kandel

Eric Richard Kandel (born November 7, 1929) is an Austrian-American neuroscientist and a University Professor of biochemistry and biophysics at the College of Physicians and Surgeons at Columbia University.

New!!: Photoreceptor cell and Eric Kandel · See more »

Fovea centralis

The fovea centralis is a small, central pit composed of closely packed cones in the eye.

New!!: Photoreceptor cell and Fovea centralis · See more »

G protein

G proteins, also known as guanine nucleotide-binding proteins, are a family of proteins that act as molecular switches inside cells, and are involved in transmitting signals from a variety of stimuli outside a cell to its interior.

New!!: Photoreceptor cell and G protein · See more »

G protein–coupled receptor

G protein–coupled receptors (GPCRs), also known as seven-(pass)-transmembrane domain receptors, 7TM receptors, heptahelical receptors, serpentine receptor, and G protein–linked receptors (GPLR), constitute a large protein family of receptors that detect molecules outside the cell and activate internal signal transduction pathways and, ultimately, cellular responses.

New!!: Photoreceptor cell and G protein–coupled receptor · See more »

Glutamic acid

Glutamic acid (symbol Glu or E) is an α-amino acid with formula.

New!!: Photoreceptor cell and Glutamic acid · See more »


Humans (taxonomically Homo sapiens) are the only extant members of the subtribe Hominina.

New!!: Photoreceptor cell and Human · See more »

Hyperpolarization (biology)

Hyperpolarization is a change in a cell's membrane potential that makes it more negative.

New!!: Photoreceptor cell and Hyperpolarization (biology) · See more »


Insects or Insecta (from Latin insectum) are hexapod invertebrates and the largest group within the arthropod phylum.

New!!: Photoreceptor cell and Insect · See more »

Intrinsically photosensitive retinal ganglion cells

Intrinsically photosensitive retinal ganglion cells (ipRGCs), also called photosensitive retinal ganglion cells (pRGC), or melanopsin-containing retinal ganglion cells (mRGCs), are a type of neuron in the retina of the mammalian eye.

New!!: Photoreceptor cell and Intrinsically photosensitive retinal ganglion cells · See more »


An ion is an atom or molecule that has a non-zero net electrical charge (its total number of electrons is not equal to its total number of protons).

New!!: Photoreceptor cell and Ion · See more »

Ion channel

Ion channels are pore-forming membrane proteins that allow ions to pass through the channel pore.

New!!: Photoreceptor cell and Ion channel · See more »

Lateral geniculate nucleus

The lateral geniculate nucleus (LGN; also called the lateral geniculate body or lateral geniculate complex) is a relay center in the thalamus for the visual pathway.

New!!: Photoreceptor cell and Lateral geniculate nucleus · See more »

Ligand-gated ion channel

Ligand-gated ion channels (LICs, LGIC), also commonly referred as ionotropic receptors, are a group of transmembrane ion-channel proteins which open to allow ions such as Na+, K+, Ca2+, and/or Cl− to pass through the membrane in response to the binding of a chemical messenger (i.e. a ligand), such as a neurotransmitter.

New!!: Photoreceptor cell and Ligand-gated ion channel · See more »


Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

New!!: Photoreceptor cell and Light · See more »

Luminous intensity

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.

New!!: Photoreceptor cell and Luminous intensity · See more »

Macular degeneration

Macular degeneration, also known as age-related macular degeneration (AMD or ARMD), is a medical condition which may result in blurred or no vision in the center of the visual field.

New!!: Photoreceptor cell and Macular degeneration · See more »


Melanopsin is a type of photopigment belonging to a larger family of light-sensitive retinal proteins called opsins and encoded by the gene Opn4.

New!!: Photoreceptor cell and Melanopsin · See more »

Membrane potential

The term "membrane potential" may refer to one of three kinds of membrane potential.

New!!: Photoreceptor cell and Membrane potential · See more »

Mesopic vision

Mesopic vision is a combination of photopic vision and scotopic vision in low but not quite dark lighting situations.

New!!: Photoreceptor cell and Mesopic vision · See more »

Metabotropic receptor

A metabotropic receptor is a type of membrane receptor of eukaryotic cells that acts through a second messenger.

New!!: Photoreceptor cell and Metabotropic receptor · See more »


The mitochondrion (plural mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms.

New!!: Photoreceptor cell and Mitochondrion · See more »


Mollusca is a large phylum of invertebrate animals whose members are known as molluscs or mollusksThe formerly dominant spelling mollusk is still used in the U.S. — see the reasons given in Gary Rosenberg's.

New!!: Photoreceptor cell and Mollusca · See more »


-ATPase (sodium-potassium adenosine triphosphatase, also known as the pump or sodium–potassium pump) is an enzyme (an electrogenic transmembrane ATPase) found in the plasma membrane of all animal cells.

New!!: Photoreceptor cell and Na+/K+-ATPase · See more »

Neuroepithelial cell

Neuroepithelial cells are the "stem cells" of the nervous system, deriving from actual stem cells in several different stages of neural development.

New!!: Photoreceptor cell and Neuroepithelial cell · See more »

Neuronal noise

Neuronal noise or neural noise refers to the random intrinsic electrical fluctuations within neuronal networks.

New!!: Photoreceptor cell and Neuronal noise · See more »

Neuroscience Information Framework

The Neuroscience Information Framework is a repository of global neuroscience web resources, including experimental, clinical, and translational neuroscience databases, knowledge bases, atlases, and genetic/genomic resources and provides many authoritative links throughout the neuroscience portal of Wikipedia.

New!!: Photoreceptor cell and Neuroscience Information Framework · See more »


Neurotransmitters are endogenous chemicals that enable neurotransmission.

New!!: Photoreceptor cell and Neurotransmitter · See more »


Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day.

New!!: Photoreceptor cell and Nocturnality · See more »

Notch signaling pathway

The Notch signaling pathway is a highly conserved cell signaling system present in most multicellular organisms.

New!!: Photoreceptor cell and Notch signaling pathway · See more »


Nyctalopia, also called night-blindness, is a condition making it difficult or impossible to see in relatively low light.

New!!: Photoreceptor cell and Nyctalopia · See more »

Opponent process

The color opponent process is a color theory that states that the human visual system interprets information about color by processing signals from cones and rods in an antagonistic manner.

New!!: Photoreceptor cell and Opponent process · See more »


Opsins are a group of proteins, made light-sensitive, via the chromophore retinal found in photoreceptor cells of the retina.

New!!: Photoreceptor cell and Opsin · See more »

Optic nerve

The optic nerve, also known as cranial nerve II, is a paired nerve that transmits visual information from the retina to the brain.

New!!: Photoreceptor cell and Optic nerve · See more »

Optical resolution

Optical resolution describes the ability of an imaging system to resolve detail in the object that is being imaged.

New!!: Photoreceptor cell and Optical resolution · See more »


In cell biology, an organelle is a specialized subunit within a cell that has a specific function, in which their function is vital for the cell to live.

New!!: Photoreceptor cell and Organelle · See more »


A phosphodiesterase (PDE) is an enzyme that breaks a phosphodiester bond.

New!!: Photoreceptor cell and Phosphodiesterase · See more »


The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force (even when static via virtual particles).

New!!: Photoreceptor cell and Photon · See more »

Photopic vision

Photopic vision is the vision of the eye under well-lit conditions (luminance level 10 to 108 cd/m2).

New!!: Photoreceptor cell and Photopic vision · See more »


Photopsins (also known as Cone opsins) are the photoreceptor proteins found in the cone cells of the retina that are the basis of color vision.

New!!: Photoreceptor cell and Photopsin · See more »

Photoreceptor protein

Photoreceptor proteins are light-sensitive proteins involved in the sensing and response to light in a variety of organisms.

New!!: Photoreceptor cell and Photoreceptor protein · See more »


Photosensitivity is the amount to which an object reacts upon receiving photons, especially visible light.

New!!: Photoreceptor cell and Photosensitivity · See more »


A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption.

New!!: Photoreceptor cell and Pigment · See more »

Pituitary adenylate cyclase-activating peptide

Pituitary adenylate cyclase-activating polypeptide also known as PACAP is a protein that in humans is encoded by the ADCYAP1 gene.

New!!: Photoreceptor cell and Pituitary adenylate cyclase-activating peptide · See more »

Pretectal area

The pretectal area, or pretectum, is a midbrain structure composed of seven nuclei and comprises part of the subcortical visual system.

New!!: Photoreceptor cell and Pretectal area · See more »

Principles of Neural Science

First published in 1981 by Elsevier, Principles of Neural Science is an influential neuroscience textbook edited by Eric R. Kandel, James H. Schwartz, and Thomas M. Jessell.

New!!: Photoreceptor cell and Principles of Neural Science · See more »

Pupillary light reflex

The pupillary light reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retinal ganglion cells of the retina in the back of the eye, thereby assisting in adaptation to various levels of lightness/darkness.

New!!: Photoreceptor cell and Pupillary light reflex · See more »

Pupillary reflex

Pupillary reflex refers to one of the reflexes associated with pupillary function.

New!!: Photoreceptor cell and Pupillary reflex · See more »

Receptive field

The receptive field of an individual sensory neuron is the particular region of the sensory space (e.g., the body surface, or the visual field) in which a stimulus will modify the firing of that neuron.

New!!: Photoreceptor cell and Receptive field · See more »

Receptor (biochemistry)

In biochemistry and pharmacology, a receptor is a protein molecule that receives chemical signals from outside a cell.

New!!: Photoreceptor cell and Receptor (biochemistry) · See more »

Resting potential

The relatively static membrane potential of quiescent cells is called the resting membrane potential (or resting voltage), as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential.

New!!: Photoreceptor cell and Resting potential · See more »


The retina is the innermost, light-sensitive "coat", or layer, of shell tissue of the eye of most vertebrates and some molluscs.

New!!: Photoreceptor cell and Retina · See more »

Retina bipolar cell

As a part of the retina, bipolar cells exist between photoreceptors (rod cells and cone cells) and ganglion cells.

New!!: Photoreceptor cell and Retina bipolar cell · See more »

Retina horizontal cell

Horizontal cells are the laterally interconnecting neurons having cell bodies in the inner nuclear layer of the retina of vertebrate eyes.

New!!: Photoreceptor cell and Retina horizontal cell · See more »


Retinal is also known as retinaldehyde.

New!!: Photoreceptor cell and Retinal · See more »

Retinal ganglion cell

A retinal ganglion cell (RGC) is a type of neuron located near the inner surface (the ganglion cell layer) of the retina of the eye.

New!!: Photoreceptor cell and Retinal ganglion cell · See more »

Retinal mosaic

Retinal mosaic is the name given to the distribution of any particular type of neuron across any particular layer in the retina.

New!!: Photoreceptor cell and Retinal mosaic · See more »

Retinitis pigmentosa

Retinitis pigmentosa (RP) is a genetic disorder of the eyes that causes loss of vision.

New!!: Photoreceptor cell and Retinitis pigmentosa · See more »

Retinohypothalamic tract

The retinohypothalamic tract (RHT) is a photic neural input pathway involved in the circadian rhythms of mammals.

New!!: Photoreceptor cell and Retinohypothalamic tract · See more »


Rhodopsin (also known as visual purple) is a light-sensitive receptor protein involved in visual phototransduction.

New!!: Photoreceptor cell and Rhodopsin · See more »

Rod cell

Rod cells are photoreceptor cells in the retina of the eye that can function in less intense light than the other type of visual photoreceptor, cone cells.

New!!: Photoreceptor cell and Rod cell · See more »

Schiff base

A Schiff base (named after Hugo Schiff) is a compound with the general structure R2C.

New!!: Photoreceptor cell and Schiff base · See more »

Scotopic vision

Scotopic vision is the vision of the eye under low-light levels.

New!!: Photoreceptor cell and Scotopic vision · See more »

Sensory nervous system

The sensory nervous system is a part of the nervous system responsible for processing sensory information.

New!!: Photoreceptor cell and Sensory nervous system · See more »

Signal transduction

Signal transduction is the process by which a chemical or physical signal is transmitted through a cell as a series of molecular events, most commonly protein phosphorylation catalyzed by protein kinases, which ultimately results in a cellular response.

New!!: Photoreceptor cell and Signal transduction · See more »

Simple eye in invertebrates

A simple eye (sometimes called a pigment pit) refers to a type of eye form or optical arrangement that contains a single lens.

New!!: Photoreceptor cell and Simple eye in invertebrates · See more »


Sodium is a chemical element with symbol Na (from Latin natrium) and atomic number 11.

New!!: Photoreceptor cell and Sodium · See more »

Sodium channel

Sodium channels are integral membrane proteins that form ion channels, conducting sodium ions (Na+) through a cell's plasma membrane.

New!!: Photoreceptor cell and Sodium channel · See more »

Soma (biology)

The soma (pl. somata or somas), perikaryon (pl. perikarya), neurocyton, or cell body is the bulbous, non-process portion of a neuron or other brain cell type, containing the cell nucleus.

New!!: Photoreceptor cell and Soma (biology) · See more »

Stimulus (physiology)

In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment.

New!!: Photoreceptor cell and Stimulus (physiology) · See more »

Suprachiasmatic nucleus

The suprachiasmatic nucleus or nuclei (SCN) is a tiny region of the brain in the hypothalamus, situated directly above the optic chiasm.

New!!: Photoreceptor cell and Suprachiasmatic nucleus · See more »

Tawny owl

The tawny owl or brown owl (Strix aluco) is a stocky, medium-sized owl commonly found in woodlands across much of Eurasia.

New!!: Photoreceptor cell and Tawny owl · See more »


Transducin (Gt) is a protein naturally expressed in vertebrate retina rods and cones and it is very important in vertebrate phototransduction.

New!!: Photoreceptor cell and Transducin · See more »


Trichromacy or trichromatism is the possessing of three independent channels for conveying color information, derived from the three different types of cone cells in the eye.

New!!: Photoreceptor cell and Trichromacy · See more »

Visual acuity

Visual acuity (VA) commonly refers to the clarity of vision.

New!!: Photoreceptor cell and Visual acuity · See more »

Visual impairment

Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses.

New!!: Photoreceptor cell and Visual impairment · See more »

Visual perception

Visual perception is the ability to interpret the surrounding environment using light in the visible spectrum reflected by the objects in the environment.

New!!: Photoreceptor cell and Visual perception · See more »

Visual phototransduction

Visual phototransduction is the sensory transduction of the visual system.

New!!: Photoreceptor cell and Visual phototransduction · See more »

Visual system

The visual system is the part of the central nervous system which gives organisms the ability to process visual detail, as well as enabling the formation of several non-image photo response functions.

New!!: Photoreceptor cell and Visual system · See more »


In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

New!!: Photoreceptor cell and Wavelength · See more »

Redirects here:

Cones and rods, Dark current (biochemistry), Light sensitive cell, Light sensitive cells, Photoreception, Photoreceptor cells, Receptor layer of retina, Retinal elements, Retinal visual cell, Retinal visual cells, Rods and cones, Vertebrate photoreceptor.


[1] https://en.wikipedia.org/wiki/Photoreceptor_cell

Hey! We are on Facebook now! »