These muscles lie on either side of the spinous processes of the vertebrae and extend throughout the lumbar, thoracic, and cervical regions.

The muscular fibers form a large fleshy mass that splits, in the upper lumbar region, into three columns, viz., a lateral (iliocostalis), an intermediate (longissimus), and a medial (spinalis).

Each of these consists of three parts, inferior to superior, as follows: The iliocostalis originates from the sacrum, erector spinae aponeurosis, and iliac crest.

It has three parts: From lateral to medial, the erector spinae muscles can be remembered using the mnemonic, I Love Spine.

Exercises include, but are not limited to: This article incorporates text in the public domain from page 397 of the 20th edition of Gray's Anatomy (1918)