OF THE BLADDER AND PROSTATE. 
33 
Sabatiee and Bell, it will be remembered, were of opinion that the trigone and luette 
are the most sensible parts of the bladder; and Bell* * * § and Guthrie^ agreed in assign- 
ing to those parts a separate and increased nervous supply. Morgagni £, Santorini §, 
and Lieutaud, as was explained, described two fleshy bodies which run from the uretral 
orifices to the verumontanum, those bodies being subsquently, though wrongly, described 
by Bell || as separate muscles. 
Without entering into too great detail, it may be stated in a general way that the 
fibres of the trigone are very similarly arranged to those of corresponding internal fibres 
anywhere else at the fundus (Plate IY. figs. 14 & 17, 2 , 2 '); the only difference being 
that they are more mixed up with fibrous tissue, the fibrous tissue causing a matting 
and thickening of the vesical parietes in this situation. The following account is intended 
to show how the ureters enter the bladder, and how the fibres of the trigone are con- 
tinued into the uvula and median ridge of the female, and the caput gallinaginis or 
verumontanum of the male (Plate Y. diagram 7, s ) ; those ridges playing an important 
part in the closure of the urethra. 
The ureters, as is well known, enter the walls of the bladder obliquely on its posterior 
aspect (Plate III. fig. 6, 2 ,). They enter midway between the posterior longitudinal and 
lateral longitudinal fibres at a point an inch and a half or so from the mesial line, and 
about the same distance from the base of the prostate. They are crossed externally 
and internally by the longitudinal slightly oblique, oblique, and very oblique fibres 
of the bladder, from all of which they receive accessions (Plate IY. fig. 14). The very 
oblique fibres, which are by much the strongest, run nearly at right angles to the longi- 
tudinal fibres of the ureters. Those portions of the ureters ( 2 , 2 ) which lay within the 
vesical parietes are therefore invested with fibres from the bladder, analogous to those 
surrounding the prostatic portion of the urethra. The ureters, in virtue of this arrange- 
ment, are more or less under the influence of the fibres of the walls of the bladder in 
their immediate vicinity, the longitudinal and slightly oblique ones tending to obliterate 
the uretral canals during contraction by the thickening they undergo, the oblique fibres 
plaiting above, beneath, and around, and closing them from without inwards or centri- 
petally. The closure is aided by the elasticity of the parts and the great obliquity of 
the uretral canals, those portions of the parietes which correspond with the track of the 
canals, particularly where the ureters open, being exceedingly thin, and acting in those 
situations as a moveable partition or valve. The valve in question responds to the 
* “ Account of the Muscles of the Ureters, and their effects on the irritable states of the Bladder.] By Charles 
Bell, Esq.,” Med. Chir. Trans, vol. iii. 1812. 
f On the Anatomy and Diseases of the Urinary Organs and Sexual Organs. By G. J. Guthrie, Esq., F.R.S. 
3rd. edit. London, 1843. 
+ Morgagni, Adversaria, i. n. 9, Adversaria iii. Animadver xlii. 
§ Observations Anatomic®, cap. x. sec. xxi. 
]| A Treatise on the Diseases of the Urethra, Vesica urinaria, Prostate, and Rectum. By Charles Bell, 
Esq., 3rd edit, with notes by John Shaw, Esq. London, 1822. 
MDCCCLXVII. f 
