. The anatomy of the human body. Human anatomy; Anatomy. THE BLADDER. 443 are so large, that they form pillars, which project into the interior of the bladder. The mucous membrane not unfrequently becomes insinuated between these columns, so as to form cells, or what is termed sacculated bladder. The base of the bladder presents three openings, viz., the orifices of the two ureters (r r,fig. 182), and the opening into the urethra. These three openings occupy the angles of an equilateral triangle (" colli- cula ab ureteribus ad urethram producta," Haller), the sur- Fig. 182. face of w
. The anatomy of the human body. Human anatomy; Anatomy. THE BLADDER. 443 are so large, that they form pillars, which project into the interior of the bladder. The mucous membrane not unfrequently becomes insinuated between these columns, so as to form cells, or what is termed sacculated bladder. The base of the bladder presents three openings, viz., the orifices of the two ureters (r r,fig. 182), and the opening into the urethra. These three openings occupy the angles of an equilateral triangle (" colli- cula ab ureteribus ad urethram producta," Haller), the sur- Fig. 182. face of which is smooth and white, and is always devoid of wrinkles or columns. This is the trigone of the bladder, or trigone of Lieutaud, which has been supposed to possess a pecuhar degree of sensibility. The posterior border (r r) of this trigone is more or less prominent in different individ- uals, and is formed by a line stretching between the orifices of the two ureters ; this prominence is prolonged outward on each side by the portion of the ureter which lies in the parietes of the bladder. It has been stated incorrectly, that the trigone is formed by the projection of the prostate, for it exists in females as well as in males, though it is less prom- inent than in the former. All that part of the base of the bladder which is behind the trigone is generally called the has fond, or inferior fundus.* Most anatomists follow Lieutaud in describing, under the name of uvula vesicce, a tubercle which arises from the low- er part of the orifice of the urethra, and partially fills up that opening; but it exists only in cases of disease, being the re- sult of hypertrophy of the middle portion of the prostate, de- s«;ribed by Home as the middle lobe. The orifices of the ureters are so constructed as to per- mit the easy passage of the urine into the bladder, but com- pletely to oppose its reflux. Their long oblique course be- neath the mucous membrane before opening into the blad- der exp
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