Anatomy study note · Back

Thoracolumbar fascia

The lumbar part of the deep fascia of the back, between the iliac crest and the 12th rib: a strong aponeurosis with septa that enclose the erector spinae.

Key points

• Iliac crest to 12th rib; encloses erector spinae.
• Posterior (spines), middle (tips of transverse processes), anterior (front of transverse processes) lamellae.
• Quadratus lumborum between middle and anterior lamellae.
• Origin of transversus, internal oblique and latissimus dorsi.
• Connective tissue: from leftover mesenchyme.
• Dense CT: irregular (capsules) or regular (tendons, ligaments).

The full note in the atlas also covers

Features · Histology · Development

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 2, PDF pp. 159–160
• Inderbir Singh’s Human Embryology, ch. 7, PDF pp. 94–95
• BRS Cell Biology & Histology, 7th ed., ch. 6, PDF p. 110

More from the back

• Vertebral column
• Atlas (C1)
• Axis (C2)
• Cervical vertebrae
• Deep muscles of the back
• Intervertebral discs
• Ligaments of the vertebral column
• Lumbar vertebrae
• Spinal cord
• Spinal nerves
• Suboccipital muscles
• Thoracic vertebrae

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