| RC | an electronic circuit containing a resistor and capacitor in series; radiocarpal; reaction center; r... |
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| RRC | residency review committee; risk reduction component; routine respiratory care; Royal Red Cross; rur... |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| TLX | trophoblast-lymphocyte cross-reactivity |
| Xfb | cross-linked Gibrin |
| snake's-head | <botany> The Guinea-hen flower; so called in England because its spotted petals resemble the scales of a snake's head. <botany> Snake's-head iris, an iridaceous plant (Hermodactylus tuberosus) of the Mediterranean region. The flowers slightly resemble a serpent's open mouth. Source: Websters Dictionary (01 Mar 1998) |
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| sperm head | The anterior, usually ovoid, nucleus-containing part of spermatozoa. (12 Dec 1998) |
| spinal muscle of head | <anatomy> An inconstant extension of spinalis cervicis to the occipital bone, sometimes fusing with semispinalis capitis. Synonym: musculus spinalis capitis, biventer cervicis, spinal muscle of head. (05 Mar 2000) |
| splenius muscle of head | <anatomy, muscle> Origin, from ligamentum nuchae of last four cervical vertebrae and supraspinous ligament of first and second thoracic vertebrae; insertion, lateral half of superior nuchal line and mastoid process; action, rotates head and extends neck; nerve supply, dorsal primary rami of second to sixth cervical spinal nerves. Synonym: musculus splenius capitis, splenius muscle of head. (05 Mar 2000) |
| superficial head of flexor pollicis brevis muscle | <anatomy> The head of the short flexor of the thumb that arises from the transverse carpal ligament and the trapezium. It is innervated by the recurrent branch of the median nerve. Synonym: caput superficiale musculi flexoris pollicis brevis. (05 Mar 2000) |
| death's-head | A naked human skull as the emblem of death; the head of the conventional personification of death. "I had rather be married to a death's-head with a bone in his mouth. <zoology> " (Shak) Death's-head moth, a very large European moth (Acherontia atropos), so called from a figure resembling a human skull on the back of the thorax. Synonym: death's-head sphinx. Source: Websters Dictionary (01 Mar 1998) |
| superior oblique muscle of head | <anatomy, muscle> Origin, transverse process of atlas; insertion, lateral third of inferior nuchal line; action, rotates head; nerve supply, suboccipital. See: suboccipital muscles. Synonym: musculus obliquus capitis superior, superior oblique muscle of head. (05 Mar 2000) |
| deep head of flexor pollicis brevis | The head of short flexor of the thumb that arises from the trapezoid and capitate bones and transverse carpal ligaments. It is innervated by the deep ulner nerve, and considered by many to be the first palmar interosseous muscle. Synonym: caput profundum musculi flexoris pollicis brevis. (05 Mar 2000) |
| swollen head syndrome | <syndrome> A disease of chickens caused by the turkey rhinotracheitis virus. (05 Mar 2000) |
| drusen of the optic nerve head | Basophilic, laminated, calcareous acellular masses that resemble crystals within the nerve head, anterior to the lamina cribrosa, that may simulate papilledema and/or cause visual field defects. Synonym: intrapapillary drusen. (05 Mar 2000) |
| inferior oblique muscle of head | <anatomy, muscle> Origin, spinous process of axis; insertion, transverse process of the atlas; action, rotates head; origin, spinous process of axis; insertion, transverse process of the atlas; nerve supply, suboccipital. See: suboccipital muscles. Synonym: musculus obliquus capitis inferior, inferior oblique muscle of head. (05 Mar 2000) |
| intra-articular ligament of costal head | Transverse fibres extending within the capsule from the ridge between the two facets on the head of the rib to the intervertebral disk. Synonym: ligamentum capitis costae intra-articulare. (05 Mar 2000) |
| oblique head | Head of origin which is diagonally situated. Nomina Anatomica lists oblique heads (caput obliquum...) of the following: 1) adductor hallucis muscle (... Musculi adductoris hallucis ); 2) adductor pollicis muscle (... Musculi adductoris pollicis ). Synonym: caput obliquum. (05 Mar 2000) |
| occipital region of head | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
| open head injury | A head injury in which there is a loss of continuity of scalp or mucous membranes; the term is sometimes used to indicate a communication between the exterior and the intracranial cavity. See: penetrating wound. (05 Mar 2000) |