Optic System
Optic System

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Optic System : sensation of light a nd color - both the retina and the optic nerve are an embryonic outgrowth of diencephalon - embryologically, the optic nerve is an axonal tract of diencephalon - like all CNS tracts, the optic nerve has astrocytes and oligodend rocytes, and is within the blood - brain barrier - embryologically, the retina derives from specialized cortex of diencephalon, including photoreceptor cells and primary image processing association n eurons - optic nerve and optic centers of brain are discussed in section on Cranial Nerve II - in the embryo, optic stalks of diencephalon grow out bilaterally to ectoderm, inducing invagination of overlying ectoderm, which then separ ates from the surface ectoderm and becomes the lens vesicle, also called the optic vesicle - lens vesicle then reciprocally induces optic stalk to invaginate, and become the optic cup, with (inner) neural retina and (outer) retinal pigme nted epithelium - lens vesicle expands as ectodermal lens cells elongate in expanding arcs of increasing radius, and fill their cytoplasm with clear ‘crystallin’ proteins ©