@bradleyblair83: Multifidus is a group of short, triangular muscles that along with the semispinalis and rotatores comprises the transversospinal group of deep back muscles. They are the thickest muscles in the transversospinal group, and are shorter than semispinalis, but longer than rotatores. Multifidus is found on either side of vertebral column, extending from the cervical all the way to the lumbar spine. The group is regionally divided into cervical multifidus, thoracic multifidus and lumbar multifidus. Origin: Multifidus cervicis: Superior articular processes of vertebrae C4-C7 Multifidus thoracis: Transverse process of thoracic vertebra Multifidus lumborum: Mammillary processes of lumbar vertebrae, posterior aspect of sacrum, posterior superior iliac spine (PSIS) of ilium and posterior sacroiliac ligament Insertion: Lateral aspect and tips of the spinous processes of vertebrae 2-5 levels above origin Action: Bilateral contraction: Extension of spine Unilateral contraction: Lateral flexion of spine (ipsilateral), rotation of spine (contralateral) Innervation: Medial branches of posterior rami of spinal nerves As part of the transversospinal muscle group, multifidus is located in the third or deep layer of deep muscles of the back. It lies deep to erector spinae, semispinalis cervicis and thoracis, while it is located superficial to rotatores muscles. Running through the groove between the spinous and transverse processes of vertebrae, multifidus overlies the laminae of cervical and thoracic vertebrae and the posterior surface of sacrum.

Bradley Blair

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Tuesday 09 December 2025 02:10:31 GMT