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Encyclopedia > Blind spot (anatomy)

In anatomy, one's blind spot is the region of the retina where the optic nerve and blood vessels pass through to connect to the back of the eye. Since there are no light receptors there, a part of the field of vision is not perceived. The brain fills in with surrounding detail and with information from the other eye, so the blind spot is not normally perceived. Major body systems: Integumentary system Muscular system Nervous system Reproductive system Respiratory system Excretory system Circulatory system Lymphatic system Skeletal system (Human skeleton) Endocrine system Digestive system Immune system Organs: Anus Appendix Brain Breast Colon or large intestine Diaphragm Ear Eye Heart Kidney Labia Larynx Liver Lung Nose Ovary Pharynx... Human eye cross-sectional view. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... The blood vessels are part of the circulatory system and function to transport blood throughout the body. ... An eye is an organ that detects light. ... Photoreceptors are light-sensitive proteins involved in the function of photoreceptor cells. ... In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ...


You can demonstrate its effect by drawing a small X on a piece of paper, then drawing a small circle about 12-15 centimetres to the right of the X:


            X                                                                                                                                                                                O


With your left eye covered, concentrate on the X. Move the paper closer and further until you find the point at which the circle disappears (this should happen about 30 cm away from the paper). Because the image is inverted by the lens of the eye, this shows that the blind spot is located to the left of (i.e. closer to the nose than) the macula (the most sensitive area, focusing on the X) of your right eye. A centimetre (American spelling: centimeter, symbol: cm) is an SI unit of length. ... The lens or crystalline lens is a component of the eye. ... Human eye cross-sectional view. ...


The blind spot is also called a scotoma, the general term for any obscuration of the visual field. The word scotoma is derived from the Greek word for darkness. ...


All vertebrates have a blind spot, but no cephalopods do. Cephalopod eyes, although superficially similar, have a different structure than vertebrate eyes. See retina for a discussion of this difference. Typical classes Petromyzontidae (lampreys) Placodermi - extinct Chondrichthyes (cartilaginous fish) Acanthodii - extinct Actinopterygii (ray-finned fish) Actinistia (coelacanths) Dipnoi (lungfish) Amphibia (amphibians) Reptilia (reptiles) Aves (birds) Mammalia (mammals) Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... Orders Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Nautilida The Cephalopods (head-foot) are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusc foot into the form of arms or tentacles. ... Human eye cross-sectional view. ...



Sensory system - Visual system - Eye  (http://en.wikipedia.org/w/wiki.phtml?title=Template:Eye&action=edit)
Optic disc - Retina - Cornea - Iris - Pupil - Lens - Macula - Sclera - Optic fovea - Blind spot - Vitreous humour - Aqueous humour - Choroid - Ciliary body - Conjunctiva - Angle structure - Tapetum lucidum


(See also sense) A sensory system is a part of the nervous system that consists of sensory receptors, neural pathways, and those parts of the brain responsible for processing the information. ... The visual system is what allows us to see. ... An eye is an organ that detects light. ... The optic disc is the point in the eye where the optic nerve enters the retina; it is not sensitive to light. ... Human eye cross-sectional view. ... The cornea is the curved, transparent layer that covers the front part of the eye and protects its inner structures. ... The human iris The iris is the grey-brown area. ... The term pupil can also mean student. ... The lens or crystalline lens is a component of the eye. ... Human eye cross-sectional view. ... The sclera is the white outer coating of the eye. ... The fovea, a part of the eye, is a spot located in the center of the macula. ... Vitreous humour is the clear gel that fills the eyeball, lying between the lens and the retina in the eye. ... The aqueous humour is the clear, watery fluid that fills the complex space in the front of the eye which is bounded at the front by the cornea and at the rear by the front surface or face of the vitreous humour. ... The choroid is a collection of blood vessels in the rear of the eye that oxygenate the retina; it is located beneath the sclera. ... There are two sets of ciliary muscles in the eye. ... The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids. ... This cats tapeta lucida make its eyes flash green in a photograph The tapetum lucidum (Latin: bright carpet) or tapetum is a reflecting layer behind the retina of the eye; it serves to reflect light back to the retina, increasing the quantity of light caught by the retina. ...

Sensory system - Visual system

Eye - Optic nerve - Optic chiasm - Optic tract - Lateral geniculate nucleus - Optic radiations - Visual cortex (See also sense) A sensory system is a part of the nervous system that consists of sensory receptors, neural pathways, and those parts of the brain responsible for processing the information. ... The visual system is what allows us to see. ... An eye is an organ that detects light. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... The optic chiasm is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the left side of the brain, and vice versa. ... The optic tract is a part of the visual system in the brain. ... The lateral geniculate nucleus (LGN) of the thalamus is a part of the brain, which is the primary processor of visual information, received from the retina, in the CNS. Schematic diagram of the primate lateral geniculate nucleus. ... Right superior quadrantanopia. ... The visual cortex is the part of the cerebral cortex that is responsible for processing visual stimuli. ...


  Results from FactBites:
 
Blind spots (601 words)
Because of this, you should have a "blind spot" (actually two, one for each eye), a place pretty much in the middle of what you can see where you can't see.
Maybe the blind spot for one eye is at a different place than the blind spot for the other (this is actually true), so you don't notice it because each eye sees what the other doesn't.
The spot disappears because it falls on the optic nerve head, the hole in the photoreceptor sheet.
Blind spot (anatomy) - Wikipedia, the free encyclopedia (274 words)
In anatomy, the blind spot is the region of the retina where the optic nerve and blood vessels pass through to connect to the back of the eye.
Because the image is inverted by the lens of the eye, this shows that the blind spot is located to the left of (i.e.
The blind spot is also called a scotoma, the general term for any obscuration of the visual field.
  More results at FactBites »

 
 

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