| Title | Infrahyoid and Suprahyoid Muscles 4 |
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| Comment | Comment: The thyrohyoid muscle is supplied by fibers of the 1st cervical nerve that happen to travel with the last, or hypoglossal, nerve (CN XII). The thyrohyoid muscle is also one of the infrahyoid or "strap"; muscles. |
| Origin | Origin: Arises from the oblique line of the lamina of the thyroid cartilage. |
| Insertion | Insertion: Attaches to the inferior border of the body and the greater horn of the hyoid bone. |
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| Innervation | Innervation: C1 via the hypoglossal nerve (CN XII). |
| Actions | Action: Depresses the hyoid bone and raises larynx during swallowing |
| Plate | Atlas Plate 28 |
| 1a | Thyrohyoid;Musculus thyrohyoideus |
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| Tags | Dope::Anatomy::Head_and_Neck |
| Title | Posterior Abdominal Wall: Internal View 1 |
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| Clinical | Clinical:The lumbocostal triangle (located just lateral and superior to the lateral arcuate ligament) is a non-muscular area between the costal and lumbar potions of the diaphragm. During trauma or with increased abdominal pressure, this portion of the diaphragm can become weakened and viscera can herniate into the thorax superiorly. |
| Comment | Comment: Superiorly, the diaphragm forms the lateral arcuate ligament (lumbocostal arch) where it passes over the quadratus lumborum. |
| Origin | Origin: Arises from the transverse processes of L3-5, the iliolumbar ligament, and the iliac crest. |
| Insertion | Insertion: Attaches to the lower border of the last rib and the transverse processes of L1-3 vertebrae. |
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| Innervation | Innervation: Subcostal nerve (T12) and L1-4 nerves |
| Actions | Action: With the pelvis fixed, this muscle laterally flexes the lumbar vertebral column (trunk). It also fixes the 12th rib during inspiration. When both quadratus lumborum muscles act together, they can help extend the lumbar vertebral column. |
| Plate | Atlas Plate 256 |
| 1a | Quadratus lumborum; M. quadratus lumborum |
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| Tags | Dope::Anatomy::Thorax |
