Pec muscle

Card Set Information

Author:
lpp3355
ID:
44682
Filename:
Pec muscle
Updated:
2010-10-24 22:34:50
Tags:
Pectoralis Major
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Description:
Pec major
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  1. What is the origin and insertion points of Pectoralis major?
    • O- Clavicular head- medial half of clavical
    • Sternal head- Sternum anterior surface , carilages of first 6 ribs and aponeurosis of the external oblique muscles

    I- Crest of greater tubercle of humerus- along lateral lip of bicipital groove
  2. What are the actions of Pectoralis Major?
    Both Heads: Adduction, medial rotation and horizontal adduction of humerus at shoulder joint.

    Clavicular head: Flexion and medial rotation of humerus at shoulder

    Sternal Head: Extension of humerus from a flexed position at shoulder
  3. What muscle is responbile for breathing?
    Diaphragm
  4. True or false the diaphragm flattens on contraction increasing the volume of thoracic cavity.
    True
  5. What is the insertion for the diaphragm?
    I- central tendo of diaphragm
  6. What is the origin of the diaphragm?
    O- costal carilages of lower 6 ribs, xkyphoid process, lateral and medial arcuate ligaments, L1, L2, L3

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