298 



ELEMENTAR Y ANA TOMY. 



[LESS. 



the eight or nine lower ribs, and its fibres pass downwards 

 and inwards (towards the mid-ventral line), being inserted 

 by muscle and membrane into the brim of the pelvis, part 

 dividing into what are called the "external" and "internal" 

 tendons of the muscle. Above, this muscle is connected with 

 the pectoralis major. 



The deeper abdominal muscle, the internal oblique, is re- 

 presented by membrane only in the mid-ventral region. It 

 passes from the ilium and adjacent structures, up towards 



FIG. 274. DEEPER ABDOMINAL MUSCLES the external oblique being removed 

 from the left side of the body, and the internal oblique and part of the rectus 

 also, from its right side. 



i, the internal oblique ; its outer tendon (2) is cut and reflected from the outside 

 of the rectus to show its deeper tendon (3), which passes within the rectus 

 except towards the pubis ; 4, transversalis ; 5, its fascia ; 6, sheath of the 

 rectus near the pubis, the conjoined aponeuroses of the abdominal muscles 

 pass in front of that muscle ; 7, pyramidalis ; 8, rectus of left side, showing 

 the tendinous intervals, or linece transverse. 



the cartilages of the ribs, its fibres mostly proceeding in the 

 reverse direction to those of the muscle last described. 



The deepest of the abdominal muscles, the transversalis, 

 springs from the ilium and lower ribs, and its fibres, proceed- 

 ing horizontally, end in an aponeurosis, which meets its fellow 

 in the mid-ventral line. The abdominal nerves extend round 

 the body between this muscle and the internal oblique. 



Rectus abdominis. This is a long muscle which, springing 

 from the pubis, ascends to the cartilages of the fifth, sixth, 

 and seventh ribs. The rectus is separated from its fellow of 



