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(See the image listed below.) Lumbar spine muscles. Extensors The extensor muscles are set up in 3 layers. The largest group of intrinsic back muscles and primary extensor is the erector spinae (or sacrospinalis). In the lower L-spine, the erector spinae looks like a single muscle. At the upper lumbar location, it divides into 3 vertical columns of muscles (iliocostalis, longissimus, spinalis).

The iliocostalis is the most lateral, and the spinalis (tiniest muscle) is the most median. The longissimus (biggest muscle) inserts on to the skull base, whereas the iliocostalis inserts onto the angles of the ribs and transverse procedures of the lower cervical vertebrae. As these muscles ascend up the vertebral column, they divide regionally depending on where the muscle attaches par excellence.

In the sacrum, it originates from the laminar area simply medial to the posterior sacral foramina, from the tendinous origins on the erector spinae, and the median surface area of the posterior exceptional iliac spine (PSIS). Each fascicle is directed superomedially towards the inferior and medial margin of the lamina and adjacent spinous procedure.

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The transversospinal muscle group acts both as an L-spine extensor and a rotator. A plethora of little, segmental muscles are the deepest layer of the back extensors. They can be divided into 2 groups, both innervated by the dorsal rami of back nerves. The levatores costarum are not usually present in the lumbar spine.

The interspinales includes short fasciculi attached in between the spinous processes of adjoining vertebrae. The intertransversarii consist of 2-3 slips of muscles, which pass in between nearby transverse procedures. They are postural stabilizers and increase the effectiveness of larger muscle group action. Forward flexors Flexors of the L-spine are divided into an iliothoracic (extrinsic) group and a femorospinal (intrinsic) group.

The femorospinal group is made up of the psoas significant and iliacus muscles.  Need More Info?  from several areas: the anterior surface and lower border of transverse procedures of L1-L5, from the bodies and discs of T12-L5. It inserts on to the lesser trochanter of the thigh and is innervated by direct fibers of the lumbar plexus (L1-L3).