| REA | radiation emergency area; radioenzymatic assay; renal anastomosis; right ear advantage |
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| RJA | regurgitant jet area |
| RMA | rapid membrane assay; refuses medical advice; Registered Medical Assistant; relative medullary area;... |
| SA | salicylic acid; saline [solution]; salt added; sarcoidosis; sarcoma; scalenus anticus; secondary ame... |
| SMA | sequential multiple analysis or analyzer; sequential multichannel autoanalyzer; simultaneous multich... |
| posterior alveolar artery | <anatomy, artery> Origin, 3rd part of maxillary artery within pterygopalatine fossa; distribution, molar and premolar teeth, gingiva and mucous membrane of maxillary sinus. Synonym: arteria alveolaris superior posterior, posterior alveolar artery, posterior dental artery. (05 Mar 2000) |
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| posterior ampullar nerve | <anatomy, nerve> A branch of the vestibular part of the eighth nerve that supplies the crista ampullaris of the posterior saemicircular duct. Synonym: nervus ampullaris posterior. (05 Mar 2000) |
| posterior antebrachial cutaneous nerve | <anatomy, nerve> A branch of the radial nerve supplying the skin of the dorsal surface of the forearm. Synonym: nervus cutaneus antebrachii posterior, posterior cutaneous nerve of forearm. (05 Mar 2000) |
| posterior antebrachial nerve | <anatomy, nerve> The deep terminal branch of the radial nerve, arises in the cubital region, penetrating and supplying the supinator and continuing with the posterior interosseous artery to supply all the extensor muscles in the forearm. Synonym: nervus interosseus posterior, nervus antebrachii posterior, deep branch of the radial nerve, dorsal interosseous nerve, nervus interosseus dorsalis, posterior antebrachial nerve. (05 Mar 2000) |
| posterior antebrachial region | The area between the radial and ulnar borders of the forearm posteriorly. Synonym: regio antebrachialis posterior, facies antebrachialis posterior, posterior antebrachial region, posterior surface of forearm. (05 Mar 2000) |
| posterior anterior jugular vein | <anatomy, vein> A variable tributary of the external jugular vein arising in the upper posterior part of the neck. (05 Mar 2000) |
| posterior aphasia | Aphasia in which there is impairment in the comprehension of spoken and written words, associated with effortless, articulated, but paraphrasic, speech and writing; malformed words, substitute words, and enologisms are charcteristic. When severe, and speech is incomprehensible, it is called jargon aphasia. The patient often appears unaware of his deficit. Synonym: fluent aphasia, impressive aphasia, posterior aphasia, psychosensory aphasia, receptive aphasia, Wernicke's aphasia. (05 Mar 2000) |
| posterior arch of atlas | The posterior arch of the atlas that connects the lateral masses of the atlas posteriorly, forming the posterior wall of the vertebral canal at this level. Synonym: arcus posterior atlantis. (05 Mar 2000) |
| posterior articular surface of dens | The facet on the posterior surface of the dens of the axis that articulates with the transverse ligament of the atlas. Synonym: facies articularis posterior dentis. (05 Mar 2000) |
| posterior asynclitism | Inclination of the foetal head so that the biparietal diameter is oblique in relation to the plane of the pelvic brim, the posterior parietal bone presenting to the parturient canal. Synonym: posterior asynclitism. (05 Mar 2000) |
| posterior atlanto-occipital membrane | The fibrous membrane that attaches between the posterior arch of the atlas and the posterior margin of the foramen magnum. Synonym: membrana atlanto-occipitalis posterior. (05 Mar 2000) |
| posterior auricular artery | <anatomy, artery> Origin: posterior aspect of external carotid just above the digastric muscle; course: ascends first between parotid gland and styloid process then between cartilage of auricle and the mastoid process; branches: muscular (digastric, stylohyoid and sternocleidomastoid), glandular (parotid), stylomastoid artery, occipital and auricular; anastomoses: anterior tympanic artery (via the stylomastoid artery) and occipital artery. Synonym: arteria auricularis posterior. (05 Mar 2000) |
| posterior auricular groove | The sulcus between the antitragus and cauda helicis overlying the antitragicohelicine fissure. Synonym: sulcus auriculae posterior. (05 Mar 2000) |
| posterior auricular muscle | <anatomy, muscle> Origin, mastoid process; insertion, posterior portion of root of auricle; action, draws back the pinna; nerve supply, facial. Synonym: musculus auricularis posterior, musculus retrahens aurem, musculus retrahens auriculam. (05 Mar 2000) |
| posterior auricular nerve | <anatomy, nerve> The first extracranial branch of the facial nerve, it passes behind the ear, supplying the posterior auricular muscle and intrinsic muscles of the auricle and, through its occipital branch, innervating the occipital belly of the occipitofrontalis muscle. Synonym: nervus auricularis posterior. (05 Mar 2000) |