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pectoralis muscle
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proteins
The Human Body avian pectoral girdle Illustration of the human neck showing labeled muscles, arteries, veins, and bones, including the sternocleidomastoid, digastric, mylohyoid, trapezius, carotid artery, jugular vein, clavicle, and thyroid cartilage. An anatomical illustration of the human upper limb and chest from the front, showing labeled muscles such as the deltoid, pectoralis major, biceps, triceps, and serratus anterior, along with the cephalic vein and thoracoacromial artery. Detailed anatomical illustration of the human upper arm from the front, showing the superficial muscles, major nerves, and tendons. Key structures like the deltoid, biceps brachii, brachialis, and associated nerves are labeled.
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pectoralis muscle: Media

anatomy
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Videos

proteins
How proteins build muscle.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

avian pectoral girdle
Pectoral girdle of a generalized bird.
Encyclopædia Britannica, Inc.
muscles of the neck; human muscle system
Muscles of the neck.
Encyclopædia Britannica, Inc.
muscles of the shoulder; human muscle system
Muscles of the shoulder.
Encyclopædia Britannica, Inc.
Human muscle system
Muscles of the upper arm.
Encyclopædia Britannica, Inc.

Interactives

The Human Body
Experience the major systems of the human body.
Encyclopædia Britannica, Inc.
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