The pectoralis major muscle originates from the clavicle, sternum, and upper six costal cartilages and inserts on the lateral lip of the bicepital groove of the humerus. It adducts the arm, medially rotates it, and the clavicular fibers also flex the arm. The pectoralis minor originates from the third, fourth, and fifth ribs and inserts on the coracoid process of the scapula. It depresses the point of the shoulder and if the scapula is fixed, it elevates the ribs of origin. The subclavius originates from the first costal cartilage and inserts on the clavicle, depressing

2. ANATOMY
PECTORAL REGION
Muscles Origin and
Insertion:

3. PECTORALIS MAJOR
ORIGIN:
Clavivle,Sternum and Upper
six(6) costal cartilages.
INSERTION:
Lateral lip of biceptial groove of
humerous.
ACTION:
Adducts the arm and rotates it
medially,clavicular fibers also flex
arm.

4. ACTION:
Adduction of arm

5. ACTION:
Shoulder HORIZONTAL adduction

6. ACTION:
Medial rotation

7. PECTORALIS MINOR:
ORIGIN:
Third,Forth,and Fifth rib.
INSERTION:
Carocoid process of scapula.
ACTION:
Depresses point of shoulder;ifscapula is
fixed,it elevates the ribs of origin.

8. Muscle attachment
view:

9. ACTION:

10. ACTION:
Depresses point of shoulder. If scapula is fixed,elevates ribs origin.

11. SUBCLAVIUS:
ORIGIN:
First costal cartilage.
INSERTION:
Clavicle.
ACTION:
Depresses clavicle and steadies this bone
during the movement of shoulder girdle.

12. Muscle attachment
view:

13. SERATUS ANTERIOR:
ORIGIN:
Upper eight ribs.
INSERTION:
Medial border amd inferior angle of
scapula.
ACTION:
Depresses the forward anterior around
the thoracic wall;rotates scapula.

14. Muscle attachment
view:

15. ACTION:

16. THANKS FOR ATTENTION…