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intrinsic Back Muscles

Iliocostalis – Functional anatomy

Overview of anatomy Iliocostalis is part of the erector spinae group, which also includes longissimus and spinalis. Iliocostalis, like the others, has 3 sections. All 9 sections of the erector spinae are gathered into a fascial compartment that extends along the spine. It is confusing to look at realistic illustrations of these muscles. Some Illustrations …

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Serratus Posterior Superior – Functional Anatomy

Serratus posterior superior is a thin, flat muscle in the upper back. It anchors on the spine and assists in the breathing process by lifting the ribs. It is deep to the extrinsic back muscles but straps over the erectors and other intrinsic back muscles. Anatomy Overview This muscle is the most superficial of the intrinsic …

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Serratus Posterior Inferior – Functional Anatomy

Serratus Posterior Inferior Serratus posterior inferior originates on T11-L2 and inserts on ribs 9-12, trapping the 9th and 10th thoracic vertebrae. There is a thin sheet of connective tissue that continues from the short bellies of the muscle on the rib to the supraspinous ligament over the spinous process. The width of this aponeurosis varies …

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Semispinalis Cervicis – Functional Anatomy

Semispinalis Cervicis Anatomy of the semispinalis cervicis tends to be variable. Attachments Semispinalis cervicis is a thin muscle that connects the transverse processes of the upper thoracic vertebrae with the mid-cervical vertebrae. This traps and compresses the lower cervical vertebrae. It is innervated by the posterior rami of the cervical vertebrae on which it attaches. …

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Quadratus Lumborum – Functional Anatomy

Quadratus lumborum, means “the square muscle in the low back.” It connects the lumbar vertebrae to the ribs and iliac crest trapping T12 and the sacrum its attachments. Quadratus Lumborum has 3 sections; iliolumbar, lumbocostal and lateral. They perform different functions, have different trigger point patterns and are best addressed as different muscles. Quadratus lumborum varies …

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Rotatores and Multifidi – Functional Anatomy

Multifidi and Rotatores Multifidi and rotatores form a thick band of muscles that fill the lamina groove. They connect the proximal transverse process of a vertebra to the spinous process of the vertebrae above it. The shortest strand is the deepest. As the strands lengthen to span more vertebrae, they become more superficial. This forms a thick web …

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