| APR | abdominoperineal resection; absolute proximal reabsorption; acute phase reaction or reactant; amebic... |
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| AR | absolute risk; accounts receivable; achievement ratio; actinic reticuloid [syndrome]; active resista... |
| ARAO | angiographic area of right anterior oblique projection |
| ARV | acquired immunodeficiency syndrome-related virus; anterior right ventricle; avian reovirus |
| ASA | acetylsalicylic acid; active systemic anaphylaxis; Adams-Stokes attack; American Society of Anesthes... |
| anterior region of thigh | The front of the thigh, including the femoral triangle. Synonym: facies femoralis anterior, anterior surface of thigh, regio femoralis anterior. (05 Mar 2000) |
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| anterior rhinoscopy | Inspection of the anterior portion of the nasal cavity with or without the aid of a nasal speculum. (05 Mar 2000) |
| anterior rhizotomy | Section of anterior spinal root. (05 Mar 2000) |
| anterior root | The motor root of a spinal nerve. Synonym: radix anterior, radix motoria, anterior root, motor root, radix ventralis. (05 Mar 2000) |
| anterior sacrococcygeal ligament | <anatomy> The continuation of the anterior longitudinal ligament uniting the sacrum and coccyx. Synonym: ligamentum sacrococcygeum anterius, anterior sacrococcygeal ligament. (05 Mar 2000) |
| anterior sacroiliac ligaments | The strong fibrous bands that reinforce the sacroiliac joint anteriorly. Synonym: ligamenta sacroiliaca anteriora, ventral sacroiliac ligaments. (05 Mar 2000) |
| anterior sacrosciatic ligament | <anatomy> The fibrous band that passes from the ischial spine to the sacrum and coccyx. Synonym: ligamentum sacrospinale, anterior sacrosciatic ligament, ligamentum sacrospinosum. (05 Mar 2000) |
| anterior scalene muscle | <anatomy, muscle> Origin, anterior tubercles of transverse processes of third to sixth cervical vertebrae; insertion, scalene tubercle of first rib; action, raises first rib; nerve supply, cervical plexus. Synonym: musculus scalenus anterior, anterior scalene muscle, musculus scalenus anticus. (05 Mar 2000) |
| anterior scleritis | Inflammation of the sclera adjacent to the cornea. (05 Mar 2000) |
| anterior sclerotomy | Incision into the anterior chamber of the eye. (05 Mar 2000) |
| anterior scrotal branch of external pudendal artery | <anatomy, artery> Distribution, skin of anterior scrotum; anastomoses, posterior scrotal branches from internal pudendal artery. Synonym: rami scrotales anteriores arteriae pudendae externae. (05 Mar 2000) |
| anterior scrotal nerves | The branches of the ilioinguinal nerve, distributed to the skin of the root of the penis, mons pubis, adjacent thigh and the anterior surface of the scrotum. Synonym: nervi scrotales anteriores. (05 Mar 2000) |
| anterior scrotal veins | Tributaries of the femoral or exteranl pudendal veins drainign the anterior aspect of the scrotum and the skin and dartos fascia of the shaft and base of the penis. Synonym: venae scrotales anteriores. (05 Mar 2000) |
| anterior segment | A delimited part or section of an organ or other structure which lies in front of or ventral to the other similar parts or sections. 1) segmentum anterius (hepar); the anterior segment of the right lobe of the liver. 2) segmentum anterius (pulmo dexter et sinister); [S 3]; the anterior segment of the superior lobe of the right and left lungs. 3) anterior segment of the eye; the intraocular segment of the eyeball occupied by the aqueous which lies in front of, and is separated from the vitreous-filled posterior segment by, the lens and zonule; it is subdivided by the iris into anterior and posterior chambers. Synonym: segmentum anterius. (05 Mar 2000) |
| anterior serratus muscle | <anatomy, muscle> Origin, from centre of lateral aspect of first eight to nine ribs; insertion, superior and inferior angles and intervening medial margin of scapula; action, rotates scapula and pulls it forward, elevates ribs; nerve supply, long thoracic from brachial plexus. Synonym: musculus serratus anterior, anterior serratus muscle, costoscapularis, musculus serratus magnus. (05 Mar 2000) |