\ 



The Abdominal Muscles. 



283 



A. and v. epigastrica Inferior 



Liganientum interfoveolare [Hesselbachi] 

 L I 1 ^r. transTersus abdominis 



Linea 

 semicircularis 



[Douglasi] 



Linea alba 



M. rectus 

 abdominis 



M.interfoveolaris 



Thin spot in the 

 posterior svall 



Falx 

 [aponeiirotica] 



iugiiinalis 



Adiiiiniculum 



lineae albae 



A. and v. 

 teslicularis 



-Ductus deferens 



A. femoralis 



V. femoralis 



M. iliopsoas 



\ Ligamentum inguinale 

 [PoupartiJ 



Annulus femoralis 

 Lig. lacunare [GimbernatiJ 

 Direction of the plica umbilicalis lateralis 



328. Posterior wall of the right inguinal canal 



in the male, vieAved from behind, 



Canalis iuguiualis (continued). Posterior wall (continued): The lateral part of 

 the plate connected with the m. transversus, which forms the posterior wall (see p. 2S2) is 

 strengthened by a band of fibers markedly concave lateralward and upward, the lu/a?nenhim inter- 

 foveolare [Hesselbachi]. This lies just in fi'ont of the a. epigastrica. It consists of fibers which 

 bend directly downward from the m. transversus and of those which go off behind the same 

 further up ; both kinds of fibers extend downward, bend around chiefly lateralward and upward, 

 partly also medianward and downawar<l to the inner surface of the lig. inguinale and fuse with 

 it. The falx inguinalis and the lig. interfoveolare vary greatly in strength and breadth. The 

 thinner spot, situated between the two, which lies directly behind the subcutaneous abdominal 

 ring, is broad, when they are narrow, and vice versa; it contains always single tendon fibers 

 of the m. ti'ansversus , consists otherwise of irregularly and loosely arranged fibers, and is 

 perforated by the a. spermatica externa and the n. spermaticus externus. On the posterior 

 surface of the posterior wall there often run a few buntUes of muscle fibers, m. interfoveolaris, 

 either directly behind the lig. interfoveolare, or somewhat more medianward; they arise like a 

 fan behind the m. transversus (sqraetimes also ft"om it) and extend downward to the posterior 

 surface of the lig. inguinale and .ihe lig. lacunare. 



The annulus ingninalis abdominalis (0. T. internal abdominal ring) lies somewhat 

 medianward above the midtlle of the lig. inguinale, is bounded medianward and below by the 

 lig. interfoveolare and flattens out gradually lateralward and upward. 



