| retinaculum |
pl. retina´cula [L. “a rope, cable”] 1. [TA] a structure that retains an organ or tissue in place. 2. an instrument or device for retracting tissues during surgery. See tenaculum.
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| retinal |
1. pertaining to the retina. 2. the aldehyde of retinol, derived from absorbed dietary carotenoids or esters of retinol, and having vitamin A activity. In the retina, retinal combines with opsins of rods (scotopsins) and cones (photopsins), functioning as the prosthetic group in the resulting visual pigments rhodopsin and the iodopsins.
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| retinal a. |
any of a group of degenerative diseases of the retina, such as retinitis pigmentosa and neuronal ceroid-lipofuscinosis.
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| retinal anlage t. |
melanotic neuroectodermal t.
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| retinal c. |
a visual cell that serves light and color vision and visual acuity. The synaptic terminal is a broad, flattened pedicle. Outside the fovea the dendritic segments are relatively short and squat with blunt, rounded tips; within the fovea the segments are elongated and narrow and thus resemble rods. There are 6 million to 7 million cones, of which some 10 per cent are concentrated in the fovea, the remainder being fairly uniformly distributed over the rest of the retina. Called also cone, cone cell, and visual c. See also visual cell , under cell, and retinal rod, under rod.
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