ABDOMEN AND PELVIS 525 



This ampulla is the ovoid enlargement in the lower part of 

 the rectum, and serves as a reservoir for faeces. It is sometimes 

 spoken of as the " faecal bladder/' Note the curves in the 

 frontal direction, produced by lateral furrows, which correspond 

 to the transverse folds of the rectum (plicae transversales recti). 

 What is the rectococcygeal muscle (M. rectococcygeus) ? The 

 rectum will be opened and its interior studied later. 



Urinary Bladder (Vesica urinaria). (Vide Figs. 279, 281, and Spalte- 

 holz, Figs. 641, 642.) 



Examine the position and form (Fig. 280) of the bladder. To 

 complete this study make use of models and cross-sections. How 

 do the position and form of the bladder differ in the two sexes? 

 How does the adult bladder differ in position and form from that 

 of the child? From what does the bladder develop embryologi- 

 cally? (Cf. Kollmann, Lehrbuch der Entwickelungsgeschichte 

 des Menschen, p. 348.) Study the following features: 



(a) Apex of bladder (apex vesicae). 



(b) Body of bladder (corpus vesicae). 



(c) Fundus of bladder (fundus vesicae). 



(d) Neck of bladder (collum vesicae). 



What is the urachus f 



Pelvic Part of Ureter (Pars pelvina ureteris). (Vide Spalteholz, Figs. 

 640, 641). 



Isolate the ureter as it enters the pelvis at the bifurcation of 

 the common iliac artery and trace it downward to the bladder. 

 Determine its relation to the plica rectovesicalis. What are the 

 relative positions of the obliterated hypogastric artery and the 

 ureter in this plica? As the ureter is traced forward, determine 

 its relations to the ductus deferens and the vesicula seminalis. 

 At what angle does it pierce the bladder wall? 



Prostate (Prostata). (Vide Figs. 227, 279, and Spalteholz, Figs. 640, 

 643> 653, 655, 656, 677.) 



Note the general size, shape, and position of this organ. 

 Determine its relations to the neighboring structures. Keview 

 the anatomy of the capsule of the prostate. Avoiding injury to 

 the venous plexus surrounding the organ, study the following: 



Lobes. 



(a) Right lobe (lobus dexter). 



(b) Left lobe (lobus sinister). 



