Also found in: Dictionary, Encyclopedia.
Related to multifidus: Quadratus lumborum


Divided into many clefts or segments.
Synonym(s): multifidus (1)
[L. multifidus, fr. multus, much, + findo, to cleave]

mul·tif·i·dus (mus·cle)

intermediate layer of deepest (transversospinales) muscles of back; origin, from the sacrum, sacroiliac ligament, mammillary processes of the lumbar vertebrae (multifidus lumborum [TA], SYN musculus multifidus lumborum [TA]), transverse processes of thoracic vertebrae (multifidus thoracis [TA], SYN musculus multifidus thoracis [TA], and articular processes of last four cervical vertebrae (multifidus cervicis [TA], SYN musculus multifidus cervicis/colli [TA]); insertion, into the spinous processes of all the vertebrae up to and including the axis; action, rotates vertebral column; nerve supply, posterior rami of spinal nerves.
Synonym(s): musculus multifidus (cervicis/colli, lumborum et thoracis) [TA], musculus multifidus spinae


a group of transversospinales muscles that span the length of the vertebral column. They are best developed in the lumbar region.
References in periodicals archive ?
2001) Effects of three different training modalities on the cross sectional area of the lumbar multifidus muscle in patients with chronic low back pain.
Lumbar flexion has less of an effect on the fascicles of multifidus because of the relatively vertical orientation of the fibres (Macintosh et al 1993).
However, the medial branches of the dorsal rami are mixed nerves that also independently and segmentally innervate the lumbar multifidus muscles [30].
Similarly, another study examining lumbar multifidus (Hides et al 1995) found very small differences (0.
To measure the electrical activity of the internal oblique (IO), RA, multifidus (MF), and erector spinae (ES) muscles during the bridging exercises on the 3 surfaces, a surface electromyography (sEMG) system (Telemyo 2400T-G2 Telemetry EMG system; Noraxon, USA) with disposable bipolar sEMG electrodes was used.
Drawing the navel toward the spine while exhaling helps initiate a pelvic floor contraction and deepening of the TVA corset, while also engaging the multifidus.
Fourth, although the stabilising treatment aims to alter motor control of the transversus abdominis and multifidus muscles, neither motor control changes nor their association with outcome were assessed.
After eight weeks, damage was seen to the lumbar multifidus muscles which hold vertebrae in place.
Boyd-Clark LC, Briggs CA and Galea MP (2002): Muscle spindle distribution, morphology, and density in longus colli and multifidus muscles of the cervical spine.