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Ribs and Sternum - Anatomy & Physiology (view source)
Revision as of 15:30, 25 July 2008
, 15:30, 25 July 2008→Thoracic Musculature
=Thoracic Musculature=
=Thoracic Musculature=
*Primarily concerned with respiration
**Inspiratory muscles enlarge the thoracic cavity
**Expiratory muscles diminish the cavity and force air out
*The most important thoracic muscle is the '''''Diaphragm''''', which separates the thoracic and abdominal cavities
**Dome-shaped, convex on its cranial surface
**Central tendon forms the vertex
***Neutral position (between full inspiration and full expiration): 6th rib behind the '''olecranon'''
**Attaches via muscular periphery to the costal arch
*''Intercostal muscles''
**External fibers run caudoventrally and internal fibers run cranioventrally
**Each is confined to a single intercostal space
*''Transversus thoracis'' arises from and covers the dorsal sternum and inserts on sternal ribs close to the costochondral junctions
*''Rectus thoracis'' covers the ends of the first four ribs in continuation of the ''rectus abdominus''
*''Serratus dorsalis'' overlies the dorsal aspect of the ribs
=Abdominal Musculature=
=Abdominal Musculature=