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PRACTICAL ANATOMY. 



QUADRATUS LUMBORUM. 



Origin Ilio-lumbar ligament, posterior part of crest 

 of ilium, and upper border of transverse process 

 of third, fourth, and fifth lumbar vertebrae. 

 Insertion Into the last rib and by tendons into the 

 transverse processes of third, fourth, and fifth lumbar. 

 Nerves Ilio-hypogastric and lumbar. 



The lumbar fascia is made by the division of the 

 trans versalis fascia into the three leaflets which are at- 

 tached to the vertebrae. The anterior leaflet is attached 



FIG. 90. TRANSVERSE SECTION OF ABDOMEN, SHOWING THE ARRANGEMENT 

 OF THE LUMBAR FASCIA 



to the anterior surface and base of the transverse proc- 

 esses of the lumbar vertebrae, and to the lower border of 

 the last rib. The middle layer is attached to the apices 

 of the transverse processes, and the posterior leaflet is 

 attached to the apices of the spinous processes. Be- 

 tween the anterior and middle leaflets is the quadratus 

 lumborum muscle, and between the middle and posterior 

 leaflets is the erector spinse mass of muscles. The 

 sheath of the rectus muscle is formed by the separation 

 of the aponeurosis of the internal oblique into an ante- 



