optic nerve
(Science: anatomy, nerve) The optic nerve. The nerve carrying impulses for the sense of sight.
The Optic Nerve
(N. Opticus; Second Nerve)
The optic nerve (Fig. 773), or nerve of sight, consists mainly of fibers derived from the ganglionic cells of the retina.
[edit] Optic nerve
Main article: Optic nerve
Information flow from the eyes (top), crossing at the optic chiasma, joining left and right eye information in the optic tract, ...
Optic nerve (sensory nerve fibres) leave the eyeball
Humour
Maintains shape of the eyeball ...
Thus the optic nerve is not telling the brain simply that light has been detected but that contrast between light and dark (i.e., shape) has been detected.
As you read the exam the photoreceptors in your retina will be stimulating the sensory neurons of your optic nerve (a cranial nerve which is part of your PNS).
Optic Chiasma the place where the optic nerves cross to the other side of the brain
(opti = the eye; chiasm = cross)
Organelle the "body parts" within a cell
(organum = an instrument‚ implement‚ engine; -elle = small) ...
Light reaching a photoreceptor causes the breakdown of the chemical rhodopsin, which in turn causes a membrane potential that is transmitted to an action potential. The action potential transfers to synapsed neurons that connect to the optic nerve.
Genetics seem to specify (in unknown ways) some of the gross features of connectivity--for example in mammals the axons of ganglion cells in the eye mostly grow through the optic nerve to a particular group of cells in the thalamus.
pecten Any of several types of comblike structures on various organisms, for example, a pigmented, vascular, and comblike process that projects into the vitreous humor from the retina at a point of entrance of the optic nerve in the eyes of all birds ...
(reh-tin-uh) [L. dim. of rete, net]
The innermost layer of the vertebrate eye, containing photoreceptor cells (rods and cones) and neurons; transmits images formed by the lens to the brain via the optic nerve.
retinal ...
 See also: Human, Trans, Cells, Brain, Eye
  
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