Page 128 - Clinical Anatomy

ECA2 7/18/06 6:43 PM Page 113

The urinary tract 113

(a)

Bladder
Prostate
Urethral crest
Colliculus seminalis
Prostatic part of
urethra
Membranous part
of urethra
Bulb
Crus

Corpus cavernosum
penis
Corpus spongiosum
penis

Spongy part of
urethra

Small lacuna

Fig. 87◊(a) The prostate,
seminal vesicles and vasa
shown in a posterior Lacuna magna in
view of the bladder. (b) navicular fossa
The prostate and urethra External urethral
in section. (b) orifice

The neck of the bladder fuses with the prostate in the male; in the female
it lies directly on the pelvic fascia surrounding the short urethra.
The muscle coat of bladder is formed by a criss-cross arrangement of
bundles; when these undergo hypertrophy in chronic obstruction (due to
an enlarged prostate, for example) they account for the typical trabeculated