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| | I (Site not responding. Last check: 2007-10-10) |
 | | Three primary extensors are the trapezius, the splenius capitis, and the semispinalis capitis. |
 | | The lungs are ventilated primarily by the diaphragm, which forms the floor of the thoracic cavity; 11 pairs of external intercostal muscles between the ribs; and 11 pairs of internal intercostal muscles between the ribs deep to the external intercostals. |
 | | The anterior and lateral walls of the abdomen have four pairs of sheetlike muscles that support the viscera, stabilize the vertebral column, and aid in respiration, urination, defecation, vomiting, and childbirth: the rectus abdominis, the external and internal obliques, and the transversus abdominis. |
| www.accd.edu /sac/biology/ratorres/torrescourses/printouts/PTR20.htm (1568 words) |
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