OF THE ABDOMEN 



435 



The Rectus is enclosed in a sheath, the rectus sheath (vagina m. recti abdominis) 

 (Figs. 327 and 328), formed by the aponeurosis of the Oblique and Transversalis 



FIG. 327. A transverse section of the abdomen in the lumbar region. 



muscles, which are arranged in the following manner. When the aponeurosis of 

 the Internal oblique arrives at the outer margin of the Rectus it divides into two 



SHEATH OF 

 RECTUS ABDOMINIS 



(anterior leaf) 



Posterior leaf Anterior leaf 



SHEATH OF RECTUS ABDOMINIS 



Fio 328. Transition of the tendon of the right internal oblique into the sheath of the rectus. (Spalteholz.) 



lamella?, one of which passes in front of the Rectus, blending with the aponeurosis 

 of the External oblique; the other, behind it, blending with the aponeurosis of the 



