Latissimus Dorsi Muscle

Latissimus Dorsi Muscle

DEFINITION – What does Latissimus Dorsi mean?

Known as ‘lats’ to body-builders everywhere, the latissimus dorsi is one of the biggest back muscles, lying posterior to the arm, just under the median dorsal region of the trapezius. Originating from the latin word ‘latus’ meaning ‘broad’, this large, fan-shaped superficial muscle is connected directly to the spine, attaching to at least four dorsal vertebrae.

FUNCTION – Latissimus Dorsi Muscle

Integral to the shoulder’s range of movement, the latissimus dorsi handles adduction (bringing the arms down towards the body’s midsection), extension (straightening actions), horizontal abduction (movement away from the midsection), flexion (bending), and internal rotation of the shoulder joint. Control (innervation) is provided by the thoracodorsal nerve, of the posterior cord of the brachial plexus.

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