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
As described by Bogduk (1997), the lumbar back muscles are those muscles that lie behind the plane of the transverse processes and which exert an action on the lumbar spine.
