428 



Arteries of the Trunk. 



Ramus iTiternus 



Ramus anterior 



M. obturator externus 



M. pectineus 

 I 



M. adductor loiigus 



Acetabulura- 



A. acetabuli- 



Kamus posterior 



Brancli to the 

 m. obturator 

 interiius 



M. quadratus- 

 femoris 



Symphysis ossium 

 pubis 



M. gracilis 

 M. adductor brevis 



M. adductor minimus 



Membraua obluraloria 



M. adductor- magnus 



469. Terminal branches of the a. obturatoria 



d extra, viewed from in front and from the rig-lit. 

 (The muscles of the thigh have been cut off short at their origin.) 



3. A. obturatoria (continued). Terminal branches: 



c) Ramus posterior, goes downward in the membrana obturatoria at the posterior margin 



of the foramen obturatum to the anterior surface of the ramus superior ossis ischii, 

 and gives off, as it goes, the a. acetabuli, M'hich passes through the incisura acetabuli 

 to the hip joint; it also gives off branches which pass through the membrane to the 

 m. obturator internus, and sends its terminal branches in part forward upon the 

 origin of the in. obturator externus, in part backward especialh' to the ischium. 



d) Ramus aiiterior, forward upon the external surface of the membrane and then, partly 



through, parti}- in front of the m. obturator externus, toward the preceding artery. 



4. A. glutaea superior (gluteal artery) (see Figs. 467, 470 and 477) goes backward 

 through the upper part of the foramen ischiadicum majus, above the m. piriformis, gives small 

 branches to the surrounding muscles and bones and divides into a superficial branch, which goes 

 downward between the mm. glutaeus maximus and medius, and into a deep branch, which runs 

 forward between the nun. glutaeus minimus and medius. This latter branch divides into a ramus 

 superior along the upper margin of the m. glutaeus minimus and into a ramus inferior in the 

 substance of the ni. glutaeus medius. It gives off, also, branches to the skm covei'ing the region. 



5. A. glutaea inferior (see Figs. 467, 470 and 477) runs backward and downward 

 between the lower margin of the m. piriformis and the lig. sacrospinosum through the lower 

 part of the foramen ischiadicum majus to the anterior surface of the m. glutaeus maximus. 

 It supplies especially this muscle, its neighbors and the skin covering that region and gives off 

 a fine a. comilans n. ischiadici which goes downward to the n. ischiadicus. 



B. Rami vlseerales. t 



1. A. umbilicalis (0. T. hypogastric artery) (see Figs. 470, 471, 510 and 511) present 

 in its full development only beft>rc birth, runs in a curve, on the inner wall of the small pelvis, 

 forward and upward to the anti^'ior abdomiiiid wall, arrives on this behind the lateral margin 

 of the tendon of the m. rectus abdominis and tln'u goes, beneath the peritonaeum in the plica 

 umbilicalis lateralis, to the navel (see also Figs. 328 and 599). It gives off the aa. vesicates 

 superiores to the upper part of the bladder. After birth cmly the beginning of the artery 

 an<l the branches to the bladder remain open, the largest part of the vessel becomes obliterated 

 to form the ligameninm umbilieale laterale (0. T. lateral false ligament'. 



