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The Erector Spinae muscle actually consists of three columns of muscles, the Iliocostalis, Longissimus, and Spinalis, each running parallel on either outer side of the Vertebra and extending from the lower back of the skull all the way down to the Pelvis.

The multifidus muscle is a series of small, triangular muscle bundles located on either side of the spinal column that make up the 2nd layer of the deep back muscles. Composed of 3 layers total, the deep back muscles are collectively called the intrinsic layer. Yet another name for this group is the transversospinal layer.

Above the transversospinal (deep) layer of back muscles is the superficial layer.The superficial layer is also known as the extrinsic muscles or the "erector spinae," or simply the paraspinal muscles.

The multifidus stabilizes the spine and helps the erector to move it.

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8y ago

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