150 SPECIAL ANATOMY. 



within outwards, connected above with the diaphragm and tri- 

 angularis sterni. Or.: 1. Cartil. costss, seventh to the twelfth 

 (the internal surface) ; 2. Cristailei labium internum (two-thirds) 

 and Lig. Poupartii; 3. Proc. transversi of the lumbar vert. 

 Ins.; fleshy above to proc. ensiform., tendinous to linea alba. 

 Use : to contract the abdominal cavity (in defecation and expira- 

 tion) stronger than the two preceding muscles. 



256. Arcus cruralis, s. ligamentum Poupartii, s. Fallopiae. 

 The inferior sharp border, reflected backwards, of the tendon 



of obliq. extern., which passes obliquely from without and above, 

 inwards and downwards between Spina ilei ant. sup. and sym- 

 physis pubis, for two inches in width from Spina Ilei, firmly 

 attached to the fasc. iliaca, and extended like a pillar, bounds 

 anteriorly a triangular space, the posterior limit of which is formed 

 by the os ilei and pubis. This space is filled up commencing 

 on the outside, with: M. Psoas and iliacus, Nerv., Jlrt. Ven., 

 cruralis, m. pectineus. 



Thefasciafemoris is attached to the inferior sharp border; the 

 free border of the reflected portion is firmly connected externally 

 to the fascia iliaca, internally to the fasc. transv. Between the 

 two borders lies a channel above concave, which is the floor of 

 the Canal, inguinalis. It first commences on the internal border 

 of m. psoas. Before the attachment to the Symphysis pubis, 

 the lig. Poupart. divides into two crura or pillars, between which 

 the triangular abdominal ring (annulus abdominalis) serves as an 

 entrance into the inguinal canal. The superior, internal pillar, 

 cms internum, broader and longer, passes away over the Sym- 

 physis pubis by the Spina, and then decussates with similar 

 fibres from the other side. The inferior pillar, cms externum, 

 is roundish, attaches itself to Spina pubis of its own side, and is 

 connected with the crista pubis by means of: 



257. Lig. Gimbernati, a triangular, horizontal, tendinous 

 band (about half an inch long), the external, concave, almost 

 sharp border of which forms the internal boundary of the annu- 

 lus cruralis. From its superior surface a tendinous band passes 

 to the fascia femoris. 



258. Jinnulus abdominalis and inguinalis externus, abdomi- 

 nal, external inguinal ring, between the crura of Lig. Poupartii 

 on the Symphysis pubis, oval or triangular, the apex directed 

 upwards and outwards, covered anteriorly by the delicate fasc. 

 superficialis [fascia spermatica extern.^, formed behind of fibres 

 from obliq. intern, transversalis, and fasc. transv., is the ex- 

 ternal opening of: 



259. Canalis inguinalis (for the spermatic cord of the male, 



