Dissection of male pelvis from a lateral approach

Trigone of bladder dissected

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Image #170-7
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Dissection of male pelvis from a lateral approach
Trigone of bladder dissected
The mucosa has been removed from the left half of the trigone to reveal the very delicate muscle fibers that continue from the longitudinal muscle of the left ureter into the trigone, extending toward the opposite ureter and also toward the urethral orifice. A heavy, sling-like layer of muscle, identified here as the m. pubovesicalis (19), lies alongside the neck of the bladder. Posteriorly its fibers appear continuous with the outer longitudinal layer of muscle of the bladder and with fibers extending upward on the ureter from this layer. Anteriorly it encircles the neck of the bladder and sends some fibers into the puboprostatic ligament.
1 . Ductus deferens
2 . Ureter left
3 . Right pointer: Uterine opening Left pointer: Interureteric fold (dissected to show muscle fibers continuous with longitudinal muscle of ureter)
4 . Right pointer: Fundus of bladder Left pointer: Uterine opening
5 . Ductus deferens
6 . Deferential plexus
7 . Apex of bladder
8 . Body of bladder
9 . Retropubic space
10 . Pubic symphysis
11 . Suspensory ligament of the penis
12 . Dorsal vein of the penis
13 . Dorsal artery of penis
14 . Sphincter muscle of urethra
15 . Seminal vesicle
16 . Rectum
17 . Prostate
18 . Upper pointer: Trigone of urinary bladder (dissected) Lower pointer: Internal urethral opening
19 . Upper pointer: Cervix of bladder Lower pointer: Pubovesicalis muscle
20 . Levator ani muscle (cut off)
21 . Urogenital diaphragm (dissected; pointers indicate superior and inferior fasciae)
22 . Upper pointer: Membranous part of urethra Lower pointer: Spongy part of urethra
23 . Bulb of penis (sectioned in midline)