Understanding anatomy of "hilus" of detrusor nerves to avoid bladder dysfunction after pelvic surgery: demonstration using fetal and adult cadavers.
OBJECTIVE
To examine the anatomy of the autonomic nerves entering the bladder using cadavers. After pelvic surgery other than cystectomy, urologists and gynecologists have great concern regarding dysuria and urinary retention postoperatively.


METHODS
We applied histologic observation of fetuses to findings in adults, because the topographic anatomy of nerves tends to be easier to understand in fetuses than in adults. We examined 5 fetal (2 males and 3 females) and 8 adult (5 males and 3 females) cadavers using histologic sections with hematoxylin-eosin staining and tyrosine hydroxylase immunostaining.


RESULTS
In the female adults, as well as in the male and female fetuses, the bladder detrusor nerves were concentrated in a limited area of the superodorsal surface of the bladder at the superomedial aspect of the ureterovesical junction (ie, the "nerve hilus"). Notably, in female adults, these nerves were loosely fasciculated in a fascial pedicle. However, the hilus was not as evident in male adults in contrast to the dense innervation of the seminal vesicles. The bladder detrusor nerves were characterized by a high concentration of tyrosine hydroxylase immunoreactive-negative fibers in contrast to the nerves to the seminal vesicles, which showed immunoreactive-positive fibers.


CONCLUSIONS
Detrusor nerves converged at a small area between the bladder and juxtavesical ureter, and these nerves enter the bladder at the "hilus." Detrusor nerve damage near the ureterovesical junction during pelvic surgery should receive more attention to avoid postoperative bladder dysfunction.
Takenaka
Atsushi
A
Division of Urology, Department of Surgery Related, Kobe University Graduate School of Medicine, Kobe, Japan. atake@med.kobe-u.ac.jp
Soga
Hideo
H
Murakami
Gen
G
Niikura
Hitoshi
H
Tatsumi
Haruyuki
H
Yaegashi
Nobuo
N
Tanaka
Kazushi
K
Fujisawa
Masato
M
D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D013509:Gynecologic Surgical Procedures / Q000009:adverse effects; D006801:Humans; D008297:Male; D011183:Postoperative Complications / Q000517:prevention & control; D001743:Urinary Bladder / Q000294:innervation*; D013520:Urologic Surgical Procedures / Q000009:adverse effects