Longissimus Thoracis Muscle
Attachments of Multifidus: Origin & Insertion
Origin: Posterior sacrum (next to foramina); superior iliac spine, mammillary processes of lumbar vertebrae, transverse processes of thoracis vertebrae, and articular processes of C4-C7.
Insertion: Spinous processes of vertebrae (except C1), 2-4 bones above origin.
Actions of the Multifidus Muscle:
- Bilateral action: extends vertebrae (except C1), 2-4 bones above origin.
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Nerve Supply to Multifidus:
- dorsal rami of spinal nerves.