PT Master Guide

Longissimus Thoracis Muscle

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In this article we will discuss about the Longissimus Thoracis Muscle. So, let’s get started.

Longissimus Thoracis Muscle

It originates with the common tendon of iliocostalis lumborum from the transverse and mammillary processes of the lumbar vertebrae and anterior layer of lumbodorsal fascia and gets inserted into the transverse processes of all thoracic vertebrae and between the tubercles and angles of lower 9-10 ribs. It is innervated by the thoracic and lumbar spinal nerves (T7-L5) and artery supply is through the lateral sacral arteries. It’s chief action is if acting unilaterally extension of vertebral column and flexion of the head and neck to the same side and if acting bilaterally extension and hyperextension of vertebral column.

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