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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).
Etymology: Paul R. Harrington, American orthopedic surgeon, b. 1911
one of the rigid, contoured metal rods inserted surgically, along with metal hooks, in the posterior elements of the spine to provide distraction and compression in treatment of scoliosis and other deformities.
a threaded metal rod used to connect distraction hooks in the stabilization of cervical vertebral instability.