| RID | radial immunodiffusion; remission-inducing drug; ruptured intervertebral disc |
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| RK | rabbit kidney; radial keratotomy; reductase kinase; rhodopsin kinase; right kidney |
| RL | radial line; radiation laboratory; reduction level; renal dysplasia-limb defects [syndrome]; resisti... |
| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |
| RPA | radial photon apsorptiometry; replication protein A; resultant physiologic acceleration; reverse pas... |
| articular surface of head of rib | An articular surface on the head of a rib that articulates with the body of a vertebra. Synonym: facies articularis capitis costae. (05 Mar 2000) |
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| big-head | 1. In horses, usually denotes osteodystrophia fibrosa. 2. Gas gangrene infection of tissues of the head, caused by Clostridium novyi in sheep, usually young rams with head wounds. 3. Photosensitization in sheep. 4. An acute disease of young rams caused by the Clostridium novyi, C. Sordellii or, rarely, C. Chauvoei and characterised by a nongaseous, nonhemorrhagic, edematous swelling of the head and neck. (05 Mar 2000) |
| bulldog head | The broad head with high vault occurring in achondroplasia. (05 Mar 2000) |
| radiate ligament of head of rib | The radiate, stellate, or anterior costovertebral ligament connecting the head of each rib to the bodies of the two vertebrae with which it articulates. Synonym: ligamentum capitis costae radiatum, ligamentum radiatum, radiate ligament, stellate ligament. (05 Mar 2000) |
| regions of head | The topographical division of the cranium in relation to the bones of the cranial vault; the regions include frontal, parietal, occipital, and temporal. Synonym: regiones capitis. (05 Mar 2000) |
| medial head | The head of origin closest to the midline. Nomina Anatomica lists medial head of the following: 1) triceps brachii muscle (... Musculi tricipitis brachii ); 2) gastrocnemius muscle (... Musculi gastrocnemii ). Synonym: caput mediale. (05 Mar 2000) |
| Medusa head | Varicose veins radiating from the umbilicus, seen in the Cruveilhier-Baumgarten syndrome, dilated ciliary arteries girdling the corneoscleral limbus in rubeosis iridis. Synonym: Medusa head. Origin: Medusa, G. Myth. Char. (05 Mar 2000) |
| greater posterior rectus muscle of head | <anatomy, muscle> Origin, spinous process of axis; insertion, middle of inferior nuchal line of occipital bone; action, rotates and draws head backward; nerve supply, dorsal branch of first cervical (suboccipital). See: suboccipital muscles. Synonym: musculus rectus capitis posterior major, greater posterior rectus muscle of head, musculus rectus capitis posticus major. (05 Mar 2000) |
| closed head injury | A head injury in which continuity of the scalp and mucous membranes is maintained. (05 Mar 2000) |
| cold in the head | An acute catarrhal inflammation of the mucous membrane of the nose, marked by sneezing, lacrimation, and a profuse secretion of watery mucus; usually associated with infection by one of the common cold viruses. Synonym: cold in the head, coryza. (05 Mar 2000) |
| pit of head of femur | A depression on the extremity of the head of the femur giving attachment to the ligamentum teres femoris. Synonym: fovea capitis ossis femoris, pit of head of femur. (05 Mar 2000) |
| muscles of head | The muscles of expression, of mastication, and the suboccipital muscles in general. Synonym: musculi capitis. (05 Mar 2000) |
| crest of head of rib | The ridge that separates the superior and inferior articular surfaces of the head of a rib. Synonym: crista capitis costae. (05 Mar 2000) |
| posterior ligament of head of fibula | A ligament uniting the posterior part of the head of the fibula to the tibia. Synonym: ligamentum capitis fibulae posterius. (05 Mar 2000) |
| crown of head | The topmost part of the head. Synonym: crown of head. (05 Mar 2000) |