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Encyclopedia > Optic chiasm
Visual pathway with optic chiasm circled
Visual pathway with optic chiasm circled

The optic chiasm (from the Greek χλαζειν 'to mark with an X', after the letter 'Χ' chi) 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. Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Comparative brain sizes In the anatomy of animals, the brain, or encephalon (Greek for in the head), is the higher, supervisory center of the nervous system. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... This article needs to be cleaned up to conform to a higher standard of quality. ...

In Siamese cats with certain genotypes of the albino gene, this wiring is disrupted, with less of the nerve crossing than is normal. To compensate lack of crossing in their brains, they cross their eyes. This is also seen in albino tigers. The Siamese is one of the first distinctly recognised breeds of Oriental cat. ... The genotype is the specific genetic makeup (the specific genome) of an individual, usually in the form of DNA. It codes for the phenotype of that individual. ... Albinism is a genetic condition resulting in a lack of pigmentation in the eyes, skin and hair. ... Tigers (Panthera tigris) are mammals of the Felidae family and one of four big cats in the Panthera genus. ...

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. ... This article needs to be cleaned up to conform to a higher standard of quality. ... The optic nerve is the nerve that transmits visual information from the retina to the brain. ... 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 general term applied to both the primary visual cortex (also known as V1) and the visual association area (V2, V3, V4, V5). ...

  Results from FactBites:
optic nerve: Definition and Much More from Answers.com (1199 words)
The optic nerve is the second of twelve paired cranial nerves but is considered to be part of the central nervous system as it is derived from an outpouching of the diencephalon during embryonic development.
It leaves the orbit (eye) via the optic canal, running postero-medially towards the optic chiasm where there is a partial decussation (crossing) of fibers from the temporal visual fields of both eyes.
The optic nerve component lengths are 1 mm in the globe, 25 mm in the orbit, 9 mm in the optic canal and 16 mm in the cranial space before joining the optic chiasm.
Optic Nerve (1104 words)
Optic nerve hypoplasia is one of the leading causes of vision loss and blindness in infants and children.
Recent evidence suggests that ganglion cell axons, that make-up the optic nerve, are not able to grow through the optic nerve head because certain chemical messengers are not present for directional growth from the eye to the brain.
Drusen of the optic nerve are little whitish or translucent bodies of various size that are in the nonmyelinated part of the optic nerve head.
  More results at FactBites »



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