Pectoral Muscle Anatomy
The pectoralis major muscle is a large muscle in the upper chest fanning across the chest from the shoulder to the breastbone. It is large and fan shaped and is composed of a sternal head and a clavicular head.
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The innervation is carried by the medial and lateral pectoral nerves c5 t1 direct branches of the brachial plexus.
Pectoral muscle anatomy. It originates at your collar bone and sternum as well as the cartilage of your upper ribs and inserts high up into your upper arm meaning it crosses your shoulder joint. Medial and lateral pectoral nerves pectoral branch of the thoracoacromial trunk. Adducts and medially rotates the upper limb and draws the scapula anteroinferiorly.
It decisively shapes the surface anatomy of the breast. The pectoralis major muscle is a strong fan shaped muscle of the shoulder joint. Furthermore it participates in forming the anterior wall of the axilla.
Explore and learn about the pectoral muscles with our 3d interactive anatomy atlas. There are two such muscles on each side of the sternum breastbone in the human body. Pectoralis major and pectoralis minor.
Explore and learn about the pectoral muscles with our 3d interactive anatomy atlas. Pectoralis muscle any of the muscles that connect the front walls of the chest with the bones of the upper arm and shoulder. The two pectoralis major muscles commonly referred to as the pecs.
The distal attachment of both heads is into the intertubercular sulcus of the humerus. Its fan shaped fibers and attachments sites allow four specific actions. Pectoral major the larger of the two muscles is the pectoral major.
Anatomyzone 1 free online anatomy resource. The pectoralis major the larger and more superficial.
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