| ARAO | angiographic area of right anterior oblique projection |
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| ARV | acquired immunodeficiency syndrome-related virus; anterior right ventricle; avian reovirus |
| ASA | acetylsalicylic acid; active systemic anaphylaxis; Adams-Stokes attack; American Society of Anesthes... |
| asc | ascending; anterior subcapsular |
| ASIS | anterior superior iliac spine |
| anterior region of arm | Area between deltoid region superiorly and anterior region of elbow inferiorly. Synonym: facies brachialis anterior, regio brachialis anterior, anterior surface of arm, facies anterior brachii. (05 Mar 2000) |
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| anterior region of elbow | The area in front of the elbow, including the cubital fossa. Synonym: facies cubitalis anterior, regio cubitalis anterior, anterior cubital region, anterior surface of elbow. (05 Mar 2000) |
| anterior region of forearm | The area between the radial and ulnar borders of the forearm anteriorly. Synonym: facies antebrachialis anterior, regio antebrachialis anterior, anterior antebrachial region, anterior surface of forearm, facies anterior antebrachii. (05 Mar 2000) |
| anterior region of leg | The anterior surface of the inferior limb between the knee and the ankle. Synonym: facies cruralis anterior, regio cruralis anterior, anterior crural region, anterior surface of leg, facies anterior cruris. (05 Mar 2000) |
| 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) |
| 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) |