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multifidus muscle : ウィキペディア英語版
multifidus muscle

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. While very thin, the multifidus muscle plays an important role in stabilizing the joints within the spine.
Located just superficially to the spine itself, the multifidus muscle spans three joint segments and works to stabilize these joints at each level.
The stiffness and stability makes each vertebra work more effectively, and reduces the degeneration of the joint structures caused by friction from normal physical activity.
These fasciculi arise:
* ''in the sacral region:'' from the back of the sacrum, as low as the fourth sacral foramen, from the aponeurosis of origin of the Sacrospinalis, from the medial surface of the posterior superior iliac spine, and from the posterior sacroiliac ligaments.
* ''in the lumbar region:'' from all the mamillary processes.
* ''in the thoracic region:'' from all the transverse processes.
* ''in the cervical region:'' from the articular processes of the lower four vertebrae.
Each fasciculus, passing obliquely upward and medially, 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.
The multifidus lies deep relative to the Spinal Erectors, Transverse Abdominus, Abdominal internal oblique muscle and Abdominal external oblique muscle.
== Multifidus muscle atrophy and association with low back pain ==
Dysfunction in the lumbar multifidus muscles is strongly associated with low back pain. The dysfunction may be a result of pain inhibition from the spine, often following injury, and tends to continue after the pain has resolved, likely contributing to the high recurrence rate of low back pain. Persistent lumbar multifidus dysfunction is identified by atrophic replacement of the multifidus with fat, which can be visualized utilizing magnetic resonance imaging.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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