Optic Foramen: From 1 Different Sources
the groove in the top of the *orbit that contains the optic nerve and the ophthalmic artery.
The Latin term for a hole. It is especially applied to natural openings in bones, such as the foramen magnum, the large opening in the base of the skull through which the brain and spinal cord are continuous.... foramen
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
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
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
a large opening in the *hip bone, below and slightly in front of the acetabulum. See also pelvis.... obturator foramen
(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
either of the paired cup-shaped outgrowths of the embryonic brain that form the retina and iris of the eyes.... optic cup
failure of the *foramen ovale to close shortly after birth resulting in an *atrial septal defect. A patent foramen ovale is present in everyone before birth but closes off in about 80% of people. It usually causes no symptoms; an isolated patent foramen ovale without any other structural heart defect is usually of no haemodynamic significance.... patent foramen ovale
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