Optic Cup: From 1 Different Sources
either of the paired cup-shaped outgrowths of the embryonic brain that form the retina and iris of the eyes.
A deterioration in the ?bres of the optic nerve (see EYE) resulting in partial or complete loss of vision. It may be caused by damage to the nerve from in?ammation or injury, or the atrophy may be secondary to disease in the eye.... optic atrophy
Otherwise known as the blind spot of the EYE, the disc is the beginning of the optic nerve – the point where nerve ?bres from the retina’s rods and cones (the light- and colour-sensitive cells) leave the eyeball.... optic disc
In?ammation of the optic nerve (see EYE) which may result in sudden loss of part of a person’s vision. It is usually accompanied by pain and tenderness on touch. The cause is uncertain, although in some cases it may be a prcursor of MULTIPLE SCLEROSIS (MS): CORTICOSTEROIDS may help by improving the loss of visual acuity, but seems not to check the long-term in?ammatory activity.... optic neuritis
Concerned with the EYE or vision.... optic
(American) A romantic woman Cupide, Cupyd, Cupyde... cupid
This is formed by a crossing-over of the two optic nerves (see EYE) which run from the back of the eyeballs to meet in the mid line beneath the brain. Nerve ?bres from the nasal part of the retina cross to link up with ?bres from the outer part of the retina of the opposite eye. The linked nerves form two separate optic tracts which travel back to the occipital lobes of the brain.... optic chiasma
n. 1. the small dome at the end of the cochlea. 2. any of several dome-shaped anatomical structures.... cupola
n. a small dome-shaped structure consisting of sensory hairs embedded in gelatinous material, forming part of a *crista in the ampullae of the semicircular canals of the ear.... cupula
n. a particle derived from *otoliths in the *utricle of the inner ear, displaced from its normal site and attached to the *cupula within the ampullary portion of one of the semicircular canals. Cupuloliths are implicated in *benign paroxysmal positional vertigo.... cupulolith
an abnormal enlargement of the central depression of the *optic disc due to loss of nerve fibres, as occurs in glaucoma.... disc cupping
a rare hereditary disorder, usually affecting young males, that is characterized by loss of central vision due to neuroretinal degeneration. Visual loss in one eye is rapid and usually followed by loss in the second eye. [T. Leber]... leber’s optic atrophy
(optic commissure) the X-shaped structure formed by the two optic nerves, which pass backwards from the eyeballs to meet in the midline beneath the brain, near the pituitary gland (see illustration). Nerve fibres from the nasal side of the retina of each eye cross over to join fibres from the lateral side of the retina of the opposite eye. The optic tracts resulting from the junction pass backwards to the occipital lobes.... optic chiasm
the groove in the top of the *orbit that contains the optic nerve and the ophthalmic artery.... optic foramen
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