cone defined in 1951 yearcone - cone;
cone - (Bot.). (Strobilus). Reproductive structure consisting of a number of sporophylls more or less compactly grouped on a central axis, e.g. cone of pine tree. (Zool.) Kind of light-sensitive nerve-cell present in retina of most vertebrates (though usually not in those which live in dim light). The cone-shaped outer segment of the cell, which is the light-sensitive part, consists largely of a stack of flat and parallel unit membranes at right angles to the cell length; it develops embryologically from a cilium and retains its characteristic 9+2 pattern of fibrils (See also: Flagellum). There are about 6 million cones in the retina of a primate. Concerned in colour discrimination, and in the most acute discrimination of detail. See also: Fovea, Rod.
near cone in Knolik
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