424 



THE BLADDER. 



from the pubes in both sexes (musculi pubo-vesicales), and, in tlie male, 

 from the adjoining part of the prostate gland, they may be traced 

 upwards along the anterior surface to the summit of the bladder ; and 

 they may likewise be followed down over the posterior surface and base 

 to the under part of the neck of the bladder, where they become at- 

 tached to the prostate in the male, and to the front of the vagina in the 



Yk'. 306. 



Fig. 306, A. — YiE'.v of the Muscular Fibres op the Bladder from before (Allen 

 Thomsou, after Pettigrew). i 



On the right side the superficial fibres are shown ; on the left the deep or circular 

 fibres chiefly are displayed, a, on the right side, the median and most sujierficial 

 bands of the longitudinal fibres, in which a slight decussation of fibres is seen ; a, tliose 

 diverging somewliat ; «", the lowest, which pass much more obliquely ; the attachment 

 of the longitudinal fibres to the prostate is shown ; on the left side c, the upper, 

 c', the middle, c", the lowest set of circular or deeper fibres ; at s, the thickest and 

 most transverse sets of these fibres forming the sphincter ; j5, half the prostate left 

 on the right side, the left having been removed ; u, the urachus, into which some of 

 the longitudinal fibres are seen prolonged. 



Fig. 306, B. — View of the Muscular Fibres of the Bladder from behind 

 (Allen Thomson, after Pettigrew). g 



On the right side the superficial fibres are displayed ; on the left the deeper fibres of 

 the same kind or intermediate fibres, and some of the circular fibres ; b, h, the median, 

 most superficial and strongest bands of longitudinal fibres on the right side ; I/, the 

 more divergmg set of fibres near the middle of the bladder ; h", the most divergent 

 fibres which surround the entrance of the ureters ; on the left side, c, c', and c", indicate 

 the deeper circular fibi-es passing round at various levels and crossing with the deeper 

 <Uverging fibres posteriorly ; s, the most transverse fibres at the neck forming the 

 sphincter ; u, the urachus ; iir, the ureters ; the left half of the prostate has been re- 

 moved to show the sphincter ; r, part of the right vas deferens and vesicula seminalis. 



female. Upon the sides the superficial fasciculi run more or less 

 obliquely, and ofcen intersect one another : in the male they reach the 

 prostate. At the summit a few are continued along the urachus (fig. 

 oOG, v). The longitudinal fibres taken together, constitute what has 

 been named the detrusor wince muscle. 



The so-called circular fibres (fig. 306, c, c, c") form a thin and some- 

 what irregular reticulated layer distributed over tlie body of the bhulder, 



