Updated: 12/25/2021

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