Multifidus muscle

Multifidus muscle
Multifidus muscle
Multifidi.png
Deep muscles of the back. (Multifidus shaded in red.)
Gray96.png
Sacrum, dorsal surface. (Multifidus attachment outlined in red.)
Latin musculus multifidus
Gray's subject #115 400
Origin Sacrum, Erector spinae Aponeurosis, PSIS, and Iliac crest
Insertion    spinous process
Artery
Nerve Posterior branches
Actions Stabilizes vertebrae in local movements of vertebral column

The multifidus (multifidus spinae : pl. multifidi ) muscle consists of a number of fleshy and tendinous fasciculi, which fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum to the axis. The multifidus is a very thin muscle.

Deep in the spine, it spans three joint segments, and works to stabilize the joints at each segmental level.

The stiffness and stability makes each vertebra work more effectively, and reduces the degeneration of the joint structures.

These fasciculi arise:

Each fasciculus, passing obliquely upward and medialward, is inserted into the whole length of the spinous process of one of the vertebræ above.

These fasciculi vary in length: the most superficial, the longest, pass from one vertebra to the third or fourth above; those next in order run from one vertebra to the second or third above; while the deepest connect two contiguous vertebrae.

Multifidus lies deep to the Spinal Erectors, Transverse Abdominus, and Abdominal external oblique muscle/Abdominal external oblique muscle.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.


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