| subcostal line | A transverse line transecting the inferiormost border of the thoracic cage, indicating the subcostal plane. See: subcostal plane. Synonym: linea subcostalis. (05 Mar 2000) |
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| subcostal | <anatomy> Situated below the costas, or ribs; as, the subcostal muscles. The subcostal muscles are distinct from, and within, the intercostal. 1. <anatomy> A subcostal muscle. 2. <zoology> One of the principal nervures of the wings of an insect. It is situated next beneath or behind the costal. See Nervure. Source: Websters Dictionary (01 Mar 1998) |
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| subcostal artery | <anatomy, artery> Origin, thoracic aorta; distribution, inferior to twelfth rib in a manner similar to posterior intercostal arteries. Synonym: arteria subcostalis. (05 Mar 2000) |
| subcostal groove | A groove in the lower inner border of the rib, lodging the intercostal vessels and nerve. Synonym: sulcus costae, subcostal groove. (05 Mar 2000) |
| subcostal muscle | <anatomy> One of a number of inconstant muscles of the posterolateral thoracic wall having the same direction as the internal intercostal muscles but extending across (deep to) one or more ribs. Synonym: musculus subcostalis, musculus infracostalis. (05 Mar 2000) |
| subcostal nerve | <anatomy, nerve> The ventral ramus of the twelfth thoracic nerve; it courses below the last rib, supplies parts of the abdominal muscles and gives off cutaneous branches to the skin of the lower-most ventrolateral abdominal wall and to the superolateral gluteal region. Synonym: nervus subcostalis. (05 Mar 2000) |
| subcostal plane | A horizontal plane passing through the inferior limits of the costal margin, i.e., the tenth costal cartilages; it marks the boundary between the hypochondriac and epigastric regions superiorly and the lateral and umbilical regions inferiorly. Synonym: planum subcostale, infracostal line. (05 Mar 2000) |
| dorsal branch of the subcostal artery | <anatomy, artery> Terminal branch (with ventral branch) of subcostal artery, distributed to posterior vertebral column, spinal cord and environs, and back at the T12-L1 vertebral level. Synonym: rami dorsales arteriae subcostalis. (05 Mar 2000) |
| alveolonasal line | A line connecting the alveolar point and the nasion. (05 Mar 2000) |
| Amberg's lateral sinus line | A line dividing the angle formed by the anterior edge of the mastoid process and the temporal line. (05 Mar 2000) |
| anocutaneous line | The line between the simple columnar epithelium of the rectum and the stratified epithelium of the anal canal. Synonym: linea anocutanea, anocutaneous line, dentate line. (05 Mar 2000) |
| anterior axillary line | A vertical line extending inferiorly from the anterior axillary fold. Synonym: linea axillaris anterior, linea preaxillaris, preaxillary line. (05 Mar 2000) |
| anterior junction line | Radiographic projection of the mediastinal tissue septum between the upper lobes behind the sternum. (05 Mar 2000) |
| anterior median line | The line of intersection of the midsagittal plane with the anterior surface of the body. Synonym: linea mediana anterior. (05 Mar 2000) |
| arcuate line | An arching or bow-shaped line. See: arcuate line of ilium, arcuate line of rectus sheath. Synonym: linea arcuata. (05 Mar 2000) |
| arcuate line of ilium | The iliac portion of the linea terminalis of the bony pelvis. Synonym: linea arcuata ossis ilii. (05 Mar 2000) |