Definition of Rod cell
1. Noun. A visual receptor cell that is sensitive to dim light.
Definition of Rod cell
1. Noun. (anatomy) Any of the cylindrical photoreceptor cells in the retina that function in dim light levels. ¹
¹ Source: wiktionary.com
Medical Definition of Rod cell
1.
Major photoreceptor cell of vertebrate retina (about 125 million in a human eye).
Columnar cells (about 40m long, 1m diameter) having three distinct regions: a region adjacent to and synapsed with, the neural layer of the retina contains the nucleus and other cytoplasmic organelles, below this is the inner segment, rich in mitochondria, that is connected through a thin neck (in which is located a ciliary body) to the outer segment.
The outer segment largely consists of a stack of discs membrane infoldings that are incompletely separated in cones) that are continually replenished near the inner segment and that are shed from the distal end and phagocytosed by the pigmented epithelium. The membranes of the discs are rich in rhodopsin, the pigment that absorbs light.
(03 Jul 1999)
Lexicographical Neighbors of Rod Cell
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