42 
DE. PETTIGrEEW ON THE MTTSCULAE AEEANGEMENTS 
{hi vw), and very oblique {mn) fibres ; the latter curving round the urethra 
(s) in two sets (m and n), and contributing largely to the formation of the 
sphincter, which is bilaterally symmetrical. The sphincter receives accessions 
of fibres from the ureters 02 , 2 '). 
2 , 2 . Ureters penetrating the walls of the bladder and appearing continuous 
within it as a strong transverse band. 
Fig. 15. Apex of adult male bladder placed on its posterior surface, seen from within, 
the converse of fig. 13 (transparent). Shows longitudinal {a 0 ), slightly oblique 
{efqt), oblique ( cjjux ), and very oblique fibres {Id). 
x. Thickened stellate patch of fibres corresponding to attachment of urachus, 
and occasioned probably by the constriction which originally separates the 
bladder from the allantois. 
Fig. 16. Apex of adult male bladder placed on its posterior surface (transparent). 
Shows anterior {a), posterior ( 0 ), and right {Jc) and left (/) longitudinal fibres 
arranged in a crucial form, with the urachus (x) as the central point, and in a 
minor degree the slightly oblique (cfq t), oblique {gj ux), and very oblique 
{Jc l) fibres seen in fig. 13. Compare with similar arrangement in fig. 18, which 
represents the fundus and cervix of the same bladder. 
Fig. 17. Fundus and cervix of adult female bladder placed on its posterior surface, seen 
from within (tranparent). Shows longitudinal {bp), slightly oblique ( ders ), 
oblique {hivw), and very oblique or circular {mn) fibres, but principally 
the longitudinal and circular ; also the continuity of the ureters with each 
other in the mesial line, and with the fibres of the uvula, &c. It likewise 
shows the trigone ( 2 , 2 ) and the funnel-shaped thickening occurring at the 
cervix, occasioned probably by the constriction which separates the bladder 
from the urethra. 
Fig. 18. Fundus and cervix of adult male bladder placed on its posterior surface (trans- 
parent). Shows anterior {b), posterior {p), and right (m) and left {n) longitu- 
dinal fibres arranged in a crucial form with the prostate {z) as a centre ; and 
in a minor degree, the slightly oblique {d e rs), oblique {hivw), and very 
oblique or circular {mn) fibres seen in fig. 14. Compare with similar arrange- 
ment in fig. 16, which represents the apex of the same bladder. 
2 2 '. Ureters penetrating the walls of the bladder and appearing continuous 
within it as a dark transverse band. 
Fig. 19. Transverse section of prostate and urethra at cervix (male). 
m . Very oblique or circular fibres of urethra forming the sphincter. Compare 
with m ml m", 1 1' l " of diagram 2, and zzz, y' y' y' of diagram 4, Plate V. 
Fig. 20. Transverse section of prostate and urethra ^ of an inch from the cervix (male). 
m. Very oblique or circular fibres of the prostatic portion of the urethra. Com- 
pare with mm'm", 1 1' l' of diagram 2, and zzz, y' y' y' of diagram 4, 
Plate Y. 
