NYC Trainer - Personal Fitness Training New York City, New York - Pectoralis Muscles

Muscles that can cause imbalances and poor posture
Pectoralis Major		Pectoralis Minor
	Pectoralis Major Origin: Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle. Insertion: Lateral lip of intertubercular groove of humerus. Action: Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly; Acting alone: clavicular head flexes humerus and sternocostal head extends it.		Pectoralis Minor Origin: 3rd to 5th ribs near their costal cartilages. Insertion: Medial border and superior surface of coracoid process of scapula. Action: Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall.
A tight Pectoralis Major will pull the arm forward causing the shoulders to turn and roll forward.		A tight Pectoralis Major will pull the arm forward causing the shoulders to turn and roll forward.