44 
DR. PETTIGREW ON THE MUSCULAR ARRANGEMENTS 
Fig. 28. Vertical section of fundus of bladder and prostate (male). Shows intimate rela- 
tion existing between bladder and prostate, and how some of the longitudinal 
fibres from the anterior wall (a) proceed to the dorsal surface of the gland (i), 
some passing through it (f) and reaching its ventral surface (c). It also 
shows how some of the longitudinal fibres from the posterior wall (h) 
pass on to the ventral surface (x), while others curve in an upward direction 
to reach the dorsal surface (iy). 
Fig. 29. A similar vertical section in the vicinity of the urethra, exhibiting a still closer 
relation of the parts (male). 
a . Longitudinal fibres from anterior wall of bladder proceeding to dorsum 
of prostate (b) and dorsal surface of urethra (w). 
o. Longitudinal fibres from posterior wall of bladder proceeding to ventral 
surface of prostate (p) and ventral surface of urethra (tv). 
Fig. 30. A third and similar vertical section through centre of prostate and urethra (male). 
Shows anterior longitudinal fibres diverging at cervix (r) and going to dorsum 
of prostate (w) and dorsal surface of urethra. 
s. Internal longitudinal submucous fibres continued into the urethra. These 
fibres are independent of those marked (r). 
t. Posterior longitudinal fibres going to ventral surface of urethra. 
v. Substance of prostate in which is to be found slightly oblique, oblique, 
and very oblique fibres. 
Fig. 31. Vertical section of the parts at the neck of the bladder in the adult female. 
a. Longitudinal fibres from anterior wall, bifurcating, some proceeding to 
dorsum of urethra (£), others in a downward direction (Z). 
o. Longitudinal fibres from posterior wall proceeding to the ventral surface 
of urethra (p), and in an upward direction (l). 
m. Very oblique or circular fibres surrounding urethra. 
Fig. 32. Vertical mesial section through cervix of bladder and urethra in adult female. 
The lettering and description corresponds to that given under fig. 30. 
Fig. 33. Horizontal section of cervix and prostate in adult male. 
a. Longitudinal fibres from right side of bladder, bifurcating, some passing 
to right side of prostate (b), others passing in a lateral direction to left 
side of bladder ( c ). 
c. Longitudinal fibres from left side of bladder proceeding to left side of 
prostate ( d ), and to right side of bladder (a). These fibres represent 
certain of the terminal loops. 
s. Oblique passage of urethra. 
Fig. 34. Eight lateral view of bladder of Koala, showing how in some of the lower 
animals the longitudinal ( a b, op, s t) and very oblique or circular fibres (m) 
predominate, and how the longitudinal fibres are thrown into ridges during 
contraction. 
