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Learn about the anatomy, function, and variations of the latissimus dorsi, a large, flat muscle on the back that stretches to the sides and behind the arm. The latissimus dorsi is involved in extension, adduction, internal rotation, and trunk movement of the shoulder joint.
Muscles which flex the elbow joint such as the biceps brachii muscle, brachialis muscles and brachioradialis muscle are active to improve leverage. [1] As the biceps originate on the scapula unlike the other two which originate on the humerus, the biceps are inclined to serve a role as a dynamic stabilizer, much as the hamstrings would during a ...
Learn about the types, actions, and anatomy of skeletal, smooth, and cardiac muscle. Find out how agonists, antagonists, synergists, and other terms describe muscle function and motion.
This is a table of skeletal muscles of the human anatomy, with muscle counts and other information. It shows the location, origin, insertion, artery, nerve, action, antagonist and innervation of each muscle.
Learn about the anatomy, function, and training of the erector spinae muscle group, which straightens and rotates the back. The erector spinae is composed of three columns (iliocostalis, longissimus, and spinalis) that originate from the sacrum, vertebrae, and iliac crest and insert on the ribs and skull.
Teres major is a muscle of the upper limb that attaches to the scapula and the humerus. It is supplied by the lower subscapular nerve and the thoracodorsal nerve, and it helps adduct, rotate and extend the humerus.
The thoracodorsal nerve is a nerve that innervates the latissimus dorsi muscle in humans and other animals. It arises from the posterior cord of the brachial plexus and passes through the axilla to the muscle.
Learn about the shoulder joint, the main joint of the shoulder, and its surrounding structures, such as the rotator cuff, the clavicle, and the scapula. The shoulder joint is a ball and socket joint that allows the arm to rotate and hinge, but also has a high risk of dislocation.