The Abdominal IMuscles. 



281 



M. obliquus iiitt'i'iius 

 ahdoniiuis 



M. obliquus 

 externus abdomiuis 



(cut through and " 

 reflected downward) - 



Lateral origin of the 

 in. creniaster 



Margo falciforinis 

 (cornu superius) 



V. femoralis 



M. obliquus externus 



: abdominis (cut throug 



and reflected median- 

 ^ ward) 



Upper wall of the 

 canalis inguinalis 

 Posterior wall of th 

 canalis inguinalis 



jNledial origin of 

 the ni. creniaster 



Funiculus spermaticus 

 with m. creniaster 



326. Right inguinal canal in the male (2"^ layer), 



viewed from in front. 



(The m. oliliquits externus abdominis has been cut tbrougb above the anterior abdominal rini;- 

 and reflected partly medianward and partly d()wnward. The spermatic cord bas been pressed 



somewhat downward within the inguinal canal.) 



Canalis iugiiiualis (continued). 



Anterior wall: formed by the tendon plate of the m. obliquus externus abdominis, 

 and also by the fibrae intercrurales. 



Lower wall: m. obliquus externus: the lig. inguinale [PoupartiJ and the fibrous bands 

 of the crus inferius immediately adjacent do not extend in their medial jjortion in a straiglit 

 line to the tuberculum pubicum but are curved somewhat downward so that they form a 

 groove open above for the spermatic cord. 



Upper wall: m. obliquus internus: the lowermost fibers of this muscle, arising from 

 the lig. mguinale, extend in curves medianward and downward, forming lateralward the mus- 

 cular, narrow, upper wall of the inguinal canal and going over n^.edianward into the anterior 

 layer of the sheath of the rectus; this medial part has its lower insertion sometimes farther 

 lateralward and then passes close in front of and along with the fiilx inguinalis to the up])er 

 surface of tlie os pubis. 



M. cremaster (see also Figs. '.V2b and 652) (in the nale) is a portion sejiarated 

 from the lower margin of the m. obliquus internus. It arises by a thick lateral bundle 

 from the upper margin of the lig. inguinale and by a weak, medial bundle from the anterior 

 layer of the sheath of the rectus : the furmer lies on the lateral, the latter on the medial surface 

 of the spermatic cord; both pass with the spermatic cord through the subcutaneous opening of 

 the inguinal canal, spread out in common upon the tunica vaginalis communis of the testis and 

 epididymis, and surround it like a loon. Action: it elevates the testis. Innervation: 

 n. spermaticus externus. In the female this nuiscle consists of only a few fibers which go to 

 the lig. teres uteri. 



