Pec muscle

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
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
What muscle is responbile for breathing?

Diaphragm
True or false the diaphragm flattens on contraction increasing the volume of thoracic cavity.

True
What is the insertion for the diaphragm?

I- central tendo of diaphragm
What is the origin of the diaphragm?

O- costal carilages of lower 6 ribs, xkyphoid process, lateral and medial arcuate ligaments, L1, L2, L3

Author

lpp3355

44682

Card Set

Pec muscle

Description

Pec major

Updated

2010-10-25T02:34:50Z

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