| musculus 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) |
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| 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) |
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| musculus iliocostalis | <anatomy> The lateral division of the erector spinae, having three subdivisions: iliocostalis lumborum musculus, iliocostalis thoracis musculus, and iliocostalis cervicis musculus. Synonym: musculus iliocostalis, iliocostal muscle. (05 Mar 2000) |
| musculus iliocostalis cervicis | <anatomy, muscle> Origin, angles of upper six ribs; insertion, transverse processes of middle cervical vertebrae; action, extends, abducts, and rotates cervical vertebrae; nerve supply, dorsal branches of upper thoracic nerves. Synonym: musculus iliocostalis cervicis, cervical iliocostal muscle, cervicalis ascendens, musculus cervicalis ascendens. (05 Mar 2000) |
| musculus iliocostalis dorsi | <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) |
| musculus iliocostalis lumborum | <anatomy, muscle> Origin, with erector spinae; insertion, the angles of lower six ribs; action, extends, abducts, and rotates lumbar vertebrae; nerve supply, dorsal branches of thoracic and lumbar nerves. Synonym: musculus iliocostalis lumborum, lumbar iliocostal muscle, musculus sacrolumbalis. (05 Mar 2000) |
| musculus interspinalis thoracis | Often poorly developed or absent muscles between spinous process of thoracic vertebrae; action, extends thoracic vertebrae; nerve supply, dorsal primary rami of thoracic nerves. Synonym: musculus interspinalis thoracis, thoracic interspinal muscle. (05 Mar 2000) |
| musculus longissimus thoracis | <anatomy, muscle> Origin, with iliocostalis and from transverse processes of lower thoracic vertebrae; insertion, by lateral slips into most or all of the ribs between angles and tubercles and into tips of transverse processes of upper lumbar vertebrae, and by medial slips into accessory processes of upper lumbar and transverse processes of thoracic vertebrae; action, extends vertebral column; nerve supply, dorsal primary rami of thoracic and lumbar spinal nerves. Synonym: musculus longissimus thoracis, musculus longissimus dorsi, thoracic longissimus muscle. (05 Mar 2000) |
| musculus rectus thoracis | <anatomy> An inconstant muscle, running parallel to the sternum across the costosternal origin of the pectoralis major, and usually connected with the sternocleidomastoid and rectus abdominis muscles due to their common development source. Synonym: musculus sternalis, musculus rectus thoracis, sternal muscle. (05 Mar 2000) |
| musculus 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) |
| musculus 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) |
| musculus transversus thoracis | transversus thoracis muscle |
| iliocostalis | See: iliocostalis muscle. (05 Mar 2000) |
| iliocostalis cervicis | <anatomy, muscle> Origin, angles of upper six ribs; insertion, transverse processes of middle cervical vertebrae; action, extends, abducts, and rotates cervical vertebrae; nerve supply, dorsal branches of upper thoracic nerves. Synonym: musculus iliocostalis cervicis, cervical iliocostal muscle, cervicalis ascendens, musculus cervicalis ascendens. (05 Mar 2000) |
| iliocostalis lumborum | <anatomy, muscle> Origin, with erector spinae; insertion, the angles of lower six ribs; action, extends, abducts, and rotates lumbar vertebrae; nerve supply, dorsal branches of thoracic and lumbar nerves. Synonym: musculus iliocostalis lumborum, lumbar iliocostal muscle, musculus sacrolumbalis. (05 Mar 2000) |
| iliocostalis muscle | <anatomy> The lateral division of the erector spinae, having three subdivisions: iliocostalis lumborum musculus, iliocostalis thoracis musculus, and iliocostalis cervicis musculus. Synonym: musculus iliocostalis, iliocostal muscle. (05 Mar 2000) |
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