Pectoralis major muscle

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Pectoralis major
Superficial muscles o the chest an front o the airm.
Sobo 1909 245.png
The trunk viewed frae the front, shawin the pectoralis major tae the richt. (Tae the left it is remuived shawin unnerlyin structures, amang ither the pectoralis minor.)
Origin Clavicular heid: anterior surface o the medial hauf o the clavicle.
Sternocostal head: anterior surface o the sternum, the superior sax costal cartilages, an the aponeurosis o the freemit oblique muscle
Insertion Lateral lip o the bicipital groove o the humerus
(anteromedial proximal humerus)
Artery pectoral branch o the thoracoacromial trunk
Nerve lateral pectoral nerve an medial pectoral nerve
Clavicular head: C5 an C6
Sternocostal heid: C7, C8 an T1
Actions Clavicular heud: flexes the humerus
Sternocostal head: Adducts the humerus
As a hale, adducts an medially rotates the humerus. It an aa draws the scapula anteriorly an inferiorly.
Antagonist Deltoid
Laitin Musculus pectoralis major
TA A04.4.01.002
FMA 9627
Anatomical terms o muscle

The pectoralis major (frae Laitin: pectus, breast) is a thick, fan-shaped muscle, situatoy at the chest (anterior) o the human bouk.