THE MUSCULAR SYSTEM. 



147 



PYRAMIDALIS. Origin, from the os pubis and anterior pubic 

 ligament; insertion, into the linea alba, midway between the 

 os pubis and umbilicus. 



QUADRATUS LUMBORUM. Origin, by two portions pos- 

 terior portion, from* crest of the ilium and ilio-lumbar ligament; 



FIG. 95. 



Muscles of abdomen: 12, external oblique; 16, rectus abdominis; 18, 

 internal oblique; 17, pyramidalis; 19, quadratus lumborum. 



, into lower border of the last rib and transverse proc- 

 fl of the three lower lumbar vertebra?; origin, anterior por- 

 tion, from upper border of the transverse processes of the lumbar 

 vertebras, from the third to the fifth; insertion, into one-half the 

 lowor margin of the last rib and apices of upper four lumbar 

 vorirbnr ; action, draws down and fixes the last rib and assists 

 in inspiration and expiration. 



