Updated: 5/17/2022

Pectoralis Major

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                        Summary
                    
                        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
                    
                        Innervation
                    
                        Lateral and medial pectoral nerves (C5-T1)
                    
                        Arterial Supply
                    
                        Pectoral branch of the thoracoacromial trunk

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Flashcards (6)

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Action	Numeric Key	Letter Key	Function Key
Show Bullets		S	Enter (frontside only)
20%	1	N
40%	2	H
60%	3	F	Enter (backside only)
80%	4	E
100%	5	M
Toss	0	T

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Anatomy⎪Pectoralis Major

Anatomy
- Pectoralis Major

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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
Innervation	Lateral and medial pectoral nerves (C5-T1)
Arterial Supply	Pectoral branch of the thoracoacromial trunk