Anterior layer of thoracolumbar fascia
Lamina anterior fasciae thoracolumbaris
- Latin synonym: Lamina profunda; Fascia musculi quadrati lumborum
- Synonym: Deep layer of thoracolumbar fascia; Quadratus lumborum fascia
- Related terms: Anterior layer; Quadratus lumborum fascia; Thoracolumbar fascia - Anterior layer; Quadratus lumborum fascia; Thoracolumbar fascia: Anterior layer; Quadratus lumborum fascia
Definition
The anterior layer of the thoracolumbar fascia (Deep layer of thoracolumbar fascia; Quadratus lumborum fascia) is one of the three layers of the of thoracolumbar fascia in the lumbar region.
The anterior layer of the thoracolumbar fascia is the fascia covering the anterior surface of Quadratus Lumborum. It is a thin layer attached, medially, to the bases of the transverse processes of the lumbar vertebrae; below, to the iliolumbar ligament; above, to the apex and lower border of the last rib. The upper margin of this fascia, which extends from the transverse process of the first lumbar vertebra to the apex and lower border of the last rib, constitutes the lateral lumbocostal arch. Laterally, it blends with the lumbodorsal fascia, the anterior layer of which intervenes between the Quadratus lumborum and the Sacrospinalis.
Laterally, the anterior layer of the thoracolumbar fascia unites with the two other layers the thoracolumbar fascia at the lateral margin of the Sacrospinalis, to form the tendon of origin of the Transversus abdominis. The aponeurosis of origin of the Serratus posterior inferior and the Latissimus dorsi are intimately blended with the lumbodorsal fascia.
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