| AION | anterior ischemic optic neuropathy |
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| AIVV | anterior informal vertebral vein |
| AL | absolute latency; acinar lumen; acute leukemia; adaptation level; albumin; alcoholism [and other dru... |
| ALAO | angiographic area of left anterior oblique projection |
| ALD | adrenoleukodystrophy; alcoholic liver disease; aldolase; anterior latissimus dorsi; Appraisal of Lan... |
| anterior region of neck | The area of the neck bounded by the mandible, the anterior border of the sternocleidomastoid muscle, and the anterior midline of the neck; it is subdivided into carotid, muscular, submandibular, and submental triangles. Synonym: anterior region of neck, regio cervicalis anterior, trigonum cervicale anterius. (05 Mar 2000) |
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| 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) |
| 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 saemicircular canals | The three bony tubes in the labyrinth of the ear within which the membranous saemicircular ducts are located; they lie in planes at right angles to each other and are known as anterior saemicircular canal, posterior saemicircular canal, and lateral saemicircular canal. Synonym: canales saemicirculares ossei. (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 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) |