Anatomy
One of the intrinsic muscles of the back.
Origin:
Fasiculi of sacrum, origin of erector spine, posterior superior iliac spine, mamillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae and articular processes of lower four cervical vertebrae.
Insertion:
Whole length of spinous processes of one of the vertebrae above.
Key Relations:
Deep to semispinalis and superficial to rotatores. Spans length of vertebral column. Best developed in the lumbar region.
Functions
-Stabilises individual vertebrae in movements of all or segments of the vertebral column.
-Assists in flexion (unilateral) and extension (bilateral).
Supply
Nerve Supply:
Dorsal rami of spinal nerves.
Clinical
Multifidus is important in the rehabilitation of lower back pain and groin strain.
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