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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.
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 types, actions, and anatomy of skeletal, smooth, and cardiac muscle. Find out how agonists, antagonists, synergists, and other terms describe muscle function and motion.
Bicipital groove (also called intertubercular groove or sulcus intertubercularis) is a deep groove on the humerus that allows for the long tendon of the biceps brachii muscle to pass. It is the lateral wall of the axilla and has a morphometry of 8 cm long and 1 cm wide in adults.
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.
The axillary arch is an arch-shaped anatomical variant of the latissimus dorsi muscle of the human back. [6] [7] Its shape varies, but its defining characteristics are its origin from the latissimus dorsi muscle, its insertion close to or on the upper anterior part of the humerus, and that it crosses the neurovascular bundle associated with the axillary nerve from dorsomedial to ventrolateral. [6]
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 ...
The lumbar fascia is the lumbar portion of the thoracolumbar fascia, which extends from the neck to the sacrum. It consists of three layers that enclose two muscular compartments and attach to the vertebrae, ribs, and ligaments.