rod

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]