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intrinsic Back Muscles

Erector Spinae – 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. The anatomy is often simplified. That’s understandable as it is both complex and variable. All 9 sections of the erector spinae are gathered into a fascial compartment that extends along the …

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Serratus Posterior Superior – Functional Anatomy

Here, you will find a functional overview of the anatomy of the serratus posterior superior. I also explore its role as a respiratory muscle. Afterward, I have links to related posts. Anatomy Overview Overview This muscle is the most superficial of the intrinsic back muscles and straps across the erectors, levator costae, and intrinsic spine muscles. Origin …

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Serratus Posterior Inferior – Functional Anatomy

Serratus Posterior Inferior Origin The spinous processes of T11-L2 Insertion the inferior border of the last four ribs, just lateral to the angle of the rib Function Its position indicates that it should extend and rotate the trunk, as well as assist in breathing, especially when breathing is forceful, or the trunk is contorted. It is, …

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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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