Muscles and Fasciae of the Lumbar Region: 1. Thoracolumbar Fascia

 1. Thoracolumbar Fascia

The thoracolumbar fascia, which is made up of the lumbar and thoracic portions of the deep fascia encasing the intrinsic back muscles, is a sizable, approximately diamond-shaped region of connective tissue.




The thoracolumbar fascia, which consists of two layers, is exceptionally well developed in the lumbar region. The latissimus dorsi and serratus posterior inferior muscles' tendons make up the posterior layer. It begins at the supraspinous ligament and the spinous processes of the lumbar spine. The iliac crest, lateral sacral crest, and medial sacral crest are all covered by this posterior fascia layer. The transverse processes of the lumbar spine are where the anterior layer is derived from. This layer's inferior edge descends to the iliac crest, while its superior edge inserts into the 12th rib. The sacrospinalis and perivertebral muscle groups' myofascial sheath is made up of these two layers, posterior and anterior. The transverse abdominis aponeurosis is made up of the two fascia layers that meet at the lateral edge of these muscle groups.



 


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