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rod

 [rod]
1. a straight, slim mass of substance.
2. one of two types of visual cells, cylindrical segments that contain rhodopsin; together with the cones they form the light-sensitive elements of the retina. See also eye and vision. Called also retinal rod.
Corti's r's pillar cells.
Harrington rod a rigid contoured metal rod used in Harrington instrumentation.
olfactory rod the slender apical portion of an olfactory bipolar neuron, a modified dendrite extending to the surface of the epithelium.
retinal rod rod (def. 2).

rod

(rod),
1. A slender cylindric structure or device.
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina; many millions of such rods, together with the cones, form the photoreceptive layer of rods and cones. Synonym(s): rod cell of retina
[A.S. rōd]

rod

(rŏd)
n.
1. Anatomy Any of various rod-shaped cells in the retina that respond to dim light. Also called rod cell.
2. Microbiology An elongated bacterium; a bacillus.

rod

Orthopedics A metal fixation device used to stabilize fractures. See Harrington rod.

rod

(rod)
1. A straight, slender, cylindric structure or device. For surgical rods, see nail;pin
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina; many millions of such rods, together with the cones, form the photoreceptive layer of rods and cones.
Synonym(s): rod cell.
[A.S. rōd]

rod

or

rod cell

a rod-shaped, light-sensitive cell lying in the more peripheral parts of the RETINA in the vertebrate eye. Rods are particularly associated with vision under conditions of low illumination and they occur in large numbers in nocturnal animals. They are not capable of colour discrimination and their visual acuity is poor (compare CONE CELL). RHODOPSIN (visual purple) is found in rods. There are some 240 million rods in the retinas of a primate.see RETINAL CONVERGENCE.

Rod

Photoreceptor that is highly sensitive to low levels of light and transmits images in shades of gray.
Mentioned in: Color Blindness

rod

(rod)
1. A straight, slender, cylindric structure or device.
2. The photosensitive, outward-directed process of a rhodopsin-containing rod cell in the external granular layer of the retina.
[A.S. rōd]
References in periodicals archive ?
Fetters, Rodlike behavior of poly(n-butyl) isocyanate from dielectric measurements, J.
5) nearly cylindrical, apex slightly curved to the right, opening dorsal, cephalic margin of opening slightly sclerotized, right margin of opening with a medial lobelike prolongation, preapical area of right margin elevated, with an acute process or rounded, near the base with lateral paired flaplike processes, heavily sclerotized vertical rodlike area (e.g., Fig.
An autohelm is a rodlike device that attaches to the tiller - the wooden handle that controls the rudder - and the side of the boat.
microtubules: Tiny rodlike structures made of the protein tublin and important in the synthesis of certain membranes.
Hydrodynamic properties of rodlike and disklike particles in dilute solution.
(1,2) The vaginal lactobacilli are gram-positive, nonmotile rodlike bacteria that grow in acid media and can tolerate acid conditions with pH <4.5.
(11) They found that rhabdomyomas are characterized by the presence of a sarcolemma sheath, rodlike cytoplasmic bodies, and cross-striations on light microscopy.
A rodlike skeleton holds up the tongue tissue (see diagram, p.
Type-1 mucus cell contains rodlike or spindle-shaped secretion while type-2 mucus cell contains granular secretion (Crofts 1929, Bevelander 1988).
The tail-end half of a spermatozeugma forms a stiffened, rodlike region consisting of the adhering portions of the midpiece and tail regions.
It is made from two types of building blocks--a diamine and a diacid--that are joined together to form long, rodlike chains.