Dilatation and closing urethral reflexes

1991 ◽  
Vol 9 (2) ◽  
Author(s):  
A. Shafik
Keyword(s):  
Urethral Reflexes

REORGANIZATION OF SOMATO-URETHRAL REFLEXES FOLLOWING SPINAL CORD INJURY IN THE RAT

1997 ◽  
Vol 158 (4) ◽  
pp. 1562-1567 ◽  
Author(s):  
Hidehiro Kakizaki ◽  
William C. de Groat
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Cord Injury ◽  
Urethral Reflexes

The role of bladder-to-urethral reflexes in urinary continence mechanisms in rats

2004 ◽  
Vol 287 (3) ◽  
pp. F434-F441 ◽  
Author(s):  
Izumi Kamo ◽  
Tracy W. Cannon ◽  
Deirdre A. Conway ◽  
Kazumasa Torimoto ◽  
Michael B. Chancellor ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Female Rats ◽  
Reflex Response ◽  
Bladder Pressure ◽  
Urinary Continence ◽  
Nerve Transection ◽  
Pelvic Nerve ◽  
Urethral Orifice ◽  
Intact Rats ◽  
Urethral Reflexes

Urethral closure mechanisms during passive increments in intravesicular pressure (Pves) were investigated using microtip transducer catheters in urethane-anesthetized female rats. After a block of reflex bladder contractions by spinal cord transection at T8-T9, abruptly raising Pves to 20, 40, or 60 cmH2O for 2 min induced a bladder pressure-dependent contractile response in a restricted portion of the middle urethra (12.5–15 mm from the urethral orifice) that was abolished by cutting the pelvic nerves bilaterally. In pelvic nerve-intact rats, the bilateral transection of either the pudendal nerves, the nerves to the iliococcygeous/pubococcygeous muscles, or the hypogastric nerves significantly reduced (49–74%) the urethral reflex response induced by passive Pves increases, and combined transection of these three sets of nerves totally abolished the urethra-closing responses. In spinal cord-intact rats, similar urethral contractile responses were elicited during Pves elevation (20 or 40 cmH2O) and were also eliminated by bilateral pelvic nerve transection. After spinal cord and pelvic nerve transection, leak point pressures, defined as the pressure inducing fluid leakage from the urethral orifice during passive Pves elevation by either bladder pressure clamping in 2.5-cmH2O steps or direct compression of the bladder, were significantly lowered by 30–35% compared with sham-operated (spinal cord-transected and pelvic nerve-intact) rats. These results indicate that 1) passive elevation of Pves can elicit pelvic afferent nerve-mediated contractile reflexes in the restricted portion of the urethra mediated by activation of sympathetic and somatic nerves and 2) bladder-to-urethral reflexes induced by passive Pves elevation significantly contribute to the prevention of stress urinary incontinence.

489: Effects of Serotonin and Noreinephrine Reuptake Inhibitors on the Bladder-to-Urethral Reflexes (BURS) Preventing Stress Urinary Incontinence (SUI)

2004 ◽  
Vol 171 (4S) ◽  
pp. 130-131 ◽  
Author(s):  
Kazumasa Torimoto ◽  
Izumi Kamo ◽  
Stephen C. Phillips ◽  
William C. De Groat ◽  
Michael B. Chancellor ◽  
...  
Keyword(s):  
Urinary Incontinence ◽  
Stress Urinary Incontinence ◽  
Urethral Reflexes
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