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Laboratory 1. Muscles of the Back
Step 12. Intrinsic Back Muscles, Deepest Layer

Rembrandt

On one side of the body cut the spinalis and longissimus muscles near their attachments to the spinous and transverse processes of the vertebrae and reflect them laterally to expose the deepest layer of intrinsic muscles of the back. Their names indicate the processes to which they are attached, or their function. These muscles include the transversospinalis, semispinalis, rotator longus and brevis, levator costalis, and multifidus muscles. See a textbook or atlas for a description of these muscles.

Links and References:
Grant's: 4.51-4.55
Netter: 162
Rohen/Yokochi: 211