| longissimus muscle | <anatomy> The intermediate division of the erector spinae muscle having three subdivisions: longissimus capitis muscle, longissimus cervicis muscle, and longissimus thoracis muscle. Synonym: musculus longissimus. (05 Mar 2000) |
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| apertura thoracis inferior | The inferior boundary of the bony thorax composed of the twelfth thoracic vertebra and the lower margins of the rib cage and sternum. Synonym: apertura thoracis inferior. (05 Mar 2000) |
| apertura thoracis superior | The upper boundary of the bony thorax composed of the first thoracic vertebra and the upper margins of the first ribs and manubrium of the sternum. Synonym: apertura thoracis superior. (05 Mar 2000) |
| cavitas thoracis | The space within the thoracic walls, bounded below by the diaphragm and above by the neck. Synonym: cavitas thoracis, cavum thoracis. (05 Mar 2000) |
| cavum thoracis | The space within the thoracic walls, bounded below by the diaphragm and above by the neck. Synonym: cavitas thoracis, cavum thoracis. (05 Mar 2000) |
| rotatores thoracis muscles | The rotators of the thoracic vertebrae. Synonym: musculi rotatores thoracis, thoracic rotator muscles. (05 Mar 2000) |
| compages thoracis | The skeleton of the thorax consisting of the thoracic vertebrae, ribs, costal cartilages, and sternum. Synonym: compages thoracis, skeleton thoracicus. (05 Mar 2000) |
| musculi intertransversarii thoracis | Origin, transverse processes of thoracic vertebrae; insertion, next superior transverse process; action, abducts thoracic vertebrae; nerve supply, dorsal primary rami of thoracic nerves. Synonym: musculi intertransversarii thoracis, thoracic intertransverse muscles. (05 Mar 2000) |
| musculi rotatores thoracis | The rotators of the thoracic vertebrae. Synonym: musculi rotatores thoracis, thoracic rotator muscles. (05 Mar 2000) |
| musculi thoracis | The muscles attaching to the rib cage including the pectoral muscles, serratus anterior, subclavius, levator muscles, intercostal muscles, transverse thoracic muscle, subcostal muscles, and diaphragm. Synonym: musculi thoracis. (05 Mar 2000) |
| semispinalis thoracis | <anatomy, muscle> Origin, transverse processes of fifth to eleventh thoracic vertebrae; insertion, spinous processes of first four thoracic and fifth and seventh cervical vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of cervical and thoracic spinal nerves. Synonym: musculus semispinalis thoracis, musculus semispinalis dorsi, semispinal muscle of thorax. (05 Mar 2000) |
| spinalis thoracis | <anatomy, muscle> Origin, spinous processes of upper lumbar and two lower thoracic vertebrae; insertion, spinous processes of middle and upper thoracic vertebrae; action, supports and extends vertebral column; nerve supply, dorsal primary rami of thoracic and upper lumbar. Synonym: musculus spinalis thoracis, musculus spinalis dorsi, spinal muscle of thorax. (05 Mar 2000) |
| iliocostalis thoracis | <anatomy, muscle> Origin, medial side of angles of lower six ribs; insertion, angles of upper six ribs; action, extends, abducts, and rotates thoracic vertebrae; nerve supply, dorsal branches of thoracic nerves. Synonym: musculus iliocostalis thoracis, musculus iliocostalis dorsi. (05 Mar 2000) |
| transversus thoracis | <anatomy, muscle> Origin, dorsal surface of xiphoid cartilage and lower portion of dorsal surface of body of sternum; insertion, second to sixth costal cartilages; action, contributes to depression of ribs, narrowing chest; nerve supply, intercostal. Synonym: musculus transversus thoracis, musculus triangularis sterni, sternocostalis muscle, transverse muscle of thorax. (05 Mar 2000) |
| musculus | <anatomy> A muscle. For histologic description, see muscle. Synonym: muscle. Origin: L. A little mouse, a muscle, fr. Mus (mur-), a mouse (05 Mar 2000) |