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| =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 |
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| =Abdominal Musculature= | | =Abdominal Musculature= |