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A MANUAL OF ANATOMY. 



versalis pass horizontally, of the internal oblique upward 

 and forward, of the external oblique downward and 

 forward. 



This arrangement insures protection against ventral her- 



Diag. 29. THE ARRANGEMENT OF THE ABDOMINAL MUSCLES AND LUMBAR 

 FASCIA. (From Holden.) i, Iliopsoas fascia. 2, Anterior layer of lumbar fascia. 

 3, Middle layer of lumbar fascia. 4, Posterior layer of lumbar fascia. 5, Aponeurosis 

 of external oblique. 6, Aponeurosis of internal oblique. 7, Aponeurosis of trans- 

 versalis. 8, Anterior portion of sheath of rectus. 9, Posterior portion of sheath 

 of rectus. a, Rectus abdominis. b, Transversalis. c, Internal oblique, d, Ex- 

 ternal oblique, e, Psoas magnus. f, Quadratus lumborum. g, Erector spinae mass. 

 h, Latissimus dorsi. 



nia, and is made use of in some operations upon the 

 abdominal viscera where the incision has to be carried 

 through the fleshy part of the muscles, as for removal 



