| 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) |
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| middle scalene muscle | <anatomy, muscle> Origin, costotransverse lamellae of transverse processes of second to sixth cervical vertebrae; insertion, first rib posterior to subclavian artery; action, raises first rib; nerve supply, cervical plexus. Synonym: musculus scalenus medius, middle scalene muscle. (05 Mar 2000) |
| posterior scalene muscle | <anatomy, muscle> Origin, posterior tubercles of transverse processes of fourth to sixth cervical vertebrae; insertion, lateral surface of second rib; action, elevates second rib; nerve supply, cervical and brachial plexuses. Synonym: musculus scalenus posterior, musculus scalenus posticus, posterior scalene muscle. (05 Mar 2000) |
| scalene | 1. <geometry> Having the sides and angles unequal; said of a triangle. Having the axis inclined to the base, as a cone. 2. <anatomy> Designating several triangular muscles called scalene muscles. Of or pertaining to the scalene muscles. <anatomy> Scalene muscles, a group of muscles, usually three on each side in man, extending from the cervical vertebrae to the first and second ribs. Origin: L. Scalenus, Gr., cf. F. Scalene. <geometry> A triangle having its sides and angles unequal. Source: Websters Dictionary (01 Mar 1998) |
| scalene hiatus | Triangular gap bounded by the scalenus anterior and scalenus medius muscles and the first rib to which the muscles attach; the hiatus provides passage for the subclavian artery and the roots of the brachial plexus. Compression of the structures passing through the hiatus by any means is manifest as "thoracic outlet syndrome." Synonym: interscalene triangle. (05 Mar 2000) |
| scalene tubercle | A small spine on the inner edge of the first rib, giving attachment to the scalenus anterior muscle. Synonym: tuberculum musculi scaleni anterioris, Lisfranc's tubercle, scalene tubercle of Lisfranc, tubercle of anterior scalene muscle. (05 Mar 2000) |
| scalene tubercle of Lisfranc | A small spine on the inner edge of the first rib, giving attachment to the scalenus anterior muscle. Synonym: tuberculum musculi scaleni anterioris, Lisfranc's tubercle, scalene tubercle of Lisfranc, tubercle of anterior scalene muscle. (05 Mar 2000) |
| smallest scalene muscle | <anatomy> An occasional independent muscular fasciculus between the scalenus anterior and medius, and having the same action and innervation. Synonym: musculus scalenus minimus, Albinus' muscle, Sibson's muscle, smallest scalene muscle. (05 Mar 2000) |
| tubercle of anterior scalene muscle | <anatomy> Anterior thalamic tubercle, a prominence at the anterior extremity of the thalamus which corresponds to the nuclei anteriores. Synonym: tuberculum anterius thalami, anterior tubercle of thalamus, scalene tubercle. (05 Mar 2000) |
| angiofollicular mediastinal lymph node hyperplasia | Solitary masses of lymphoid tissue containing concentric perivascular aggregates of lymphocytes, occurring usually in the mediastinum or hilar region of young adults; similar changes have been reported outside the mediastinum and, if associated with interfollicular sheets of plasma cells, may progress to lymphoma or plasmacytoma. Synonym: angiofollicular mediastinal lymph node hyperplasia, Castleman's disease. (05 Mar 2000) |
| anterior tibial lymph node | A small inconstant lymph node in front of the interosseous membrane along the upper part of the anterior tibial vessels. Synonym: nodus tibialis anterior, anterior tibial node. (05 Mar 2000) |
| anterior tibial node | A small inconstant lymph node in front of the interosseous membrane along the upper part of the anterior tibial vessels. Synonym: nodus tibialis anterior, anterior tibial node. (05 Mar 2000) |
| artery to atrioventricular node | The atrioventricular branches or the nodal branches, the small arteries supplying the atrioventricular node; they usually arise from the right coronary artery where it starts to descend the posterior interventricular sulcus. Synonym: ramus nodi atrioventricularis, atrioventricular nodal branch, branch to atrioventricular node. (05 Mar 2000) |
| artery to the sinuatrial node | Ascending atrial branch, usually (55%) arising from the anterior stem of the right coronary artery (but 35-45% arising from the circumflex branch of the left coronary artery), which runs around the base of the superior vena cava to reach the sinuatrial node. Synonym: ramus nodi sinuatrialis arteriae coronaria dextra, branch to sinuatrial node, sinuatrial nodal branch of right coronary artery, sinuatrial node artery. (05 Mar 2000) |
| atrioventricular node | <cardiology> The location in the heart's conduction system, between the atria and the ventricles, which conducts the normal electrical impulse from the atria to the ventricles. (27 Sep 1997) |