| PVR | peripheral vascular resistance; perspective volume rendering; poliovirus receptor; postvoiding resid... |
|---|---|
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| RLC | residual lung capacity |
| RLO | residual lymphatic output |
| RN | radionuclide; red nucleus; Registered Nurse; registry number; residual nitrogen; reticular nucleus |
| nuclear spindle | See: spindle and mitosis. (18 Nov 1997) |
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| Krukenberg's spindle | A vertical fusiform area of melanin pigmentation on the posterior surface of the central cornea. (05 Mar 2000) |
| Kuhne's spindle | A fusiform end organ in skeletal muscle in which afferent and a few efferent nerve fibres terminate; it contains from 3 to 10 striated muscle fibres (intrafusal fibres) that are much smaller than the ordinary muscle fibres, are separated from them by a capsule that encloses the organ, and are innervated by the thin axon of a gamma motoneuron (gamma motor fibre); the sensory endings that occur on the intrafusal fibres are either annulospiral or flower spray endings; this sensory end organ is particularly sensitive to passive stretch of the muscle in which it is enclosed. Synonym: Kuhne's spindle, muscle spindle. (05 Mar 2000) |