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Extrinsic Muscles of Back (Left)
Muscular System

Extrinsic Muscles of Back (Left)

Musculi externi dorsi

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Description

The extrinsic muscles are one of two subgroups of muscles of the back, the other being the intrinsic muscles. These muscles lie superficial to the thoracolumbar fascia and the intrinsic muscles of back. Overall, the extrinsic muscles of back are involved in movements of the pectoral (shoulder) girdle, arm, and ribs.

The extrinsic muscles of back consist of the:

- trapezius;

- latissimus dorsi;

- rhomboid major;

- rhomboid minor;

- levator scapulae;

- serratus posterior superior;

- serratus posterior inferior.

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Back Muscle

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What happens to the back muscles is that, as one shoulder is pulled forward by the muscles on one half of the back, the same muscles on the opposite side must relax (this is a physiological law).

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