Thoracolumbar Fascia

Question 1

Thoracolumbar fascia

Answer 1

1. Extends high up to neck back and below sacrum binding back muscles to vertebral column sides
2. In lumbar region, it is well formed, thickened (sometimes called lumbar fascia)
3. Composed of 3 layers: anterior, middle, and posterior

Question 2

Anterior layer

Answer 2

1. Covers quadratus lumborum anterior surface
2. Thickened above as lateral arcuate ligament

Question 3

Middle layer

Answer 3

1. Covers quadratus lumborum posterior surface
2. Fuses with anterior layer at muscle lateral margin
3. Medial, it reaches back of lumbar vertebrae tranverse processes
4. Separates quadratus lumborum from sacrospinalis

Question 4

Posterior layer

Answer 4

1. Covers sacrospinalis back
2. Medial, it gains attachment to vertebrae spines
3. Lateral, it fuses with back of lumbar fascia middle layer

Question 5

Lumbar fascia lateral border

Answer 5

Gives origin to internal oblique and transverse abdominis