optic cup

cup (kup) a depression or hollow.

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glaucomatous cup  a form of optic disk depression peculiar to glaucoma.

optic cup 

1. a depression in the center of the optic disk.

2. an indentation of the distal wall of the optic vesicle, brought about by rapid marginal growth and producing a double-layered cup.

physiologic cup  optic c. (1)

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optic cup

n.

A two-walled cuplike depression, formed by invagination of the optic vesicle, that develops into the pigmented and sensory layers of the retina. Also called eyecup.

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optic cup,

a two-layered embryonic cavity that develops in early pregnancy. The optic cup is completed by the seventh week with the closing of the choroidal fissure. The cup initially develops from the infolding of the optic vesicle after the vesicle separates from the embryonic ectoderm. The cells of the optic cup differentiate to form the retina that first develops its layers of rods and cones in the central part of the cup, growing as the layer gradually spreads toward the cup margin. The outer layer of the cup persists as the pigmented layer of the retina; the inner layer develops the nervous elements and the supporting fibers of the retina. Compare optic stalk.

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cup

a depression or hollow.

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glaucomatous cup

a depression of the optic disk due to persistently increased intraocular pressure, broader and deeper than a physiological cup, and occurring first at the temporal side of the disk.

optic cup

an evagination of the optic vesicle, an outgrowth from the neural tube, which forms a cup, the forerunner of the eyeball.

physiological cup

a slight depression sometimes observed in the optic disk.

tooth cup

central depression on the occlusal surface of the horse's incisor teeth at the time of eruption; as the horse ages and the occlusal surface is eroded, the cup becomes smaller and eventually disappears; the reducing size is used in aging of horses by their teeth.

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cup, optic 

1. A double layered cup-shaped structure attached to the forebrain of the embryo by means of a hollow stalk. It develops into the retina and inner layers of the ciliary body and iris. It is formed by the invagination of the outer wall of the optic vesicle. Subsequently, nerve cells develop in its invaginated layer and some of these send their axons back along the hollow stalk (optic stalk or lens stalk) to form the optic nerve. Syn. ocular cup; ophthalmic cup; secondary optic vesicle.

2. Synonym for physiological cup. See anophthalmia; ectoderm; optic fissure; optic vesicle.