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Titolo:
Mechanism of ejection during ejaculation: Identification of a urethrocavernosus reflex
Autore:
Shafik, A; El-Sibai, O;
Indirizzi:
Cairo Univ, Dept Surg & Expt Res, Cairo, Egypt Cairo Univ Cairo EgyptCairo Univ, Dept Surg & Expt Res, Cairo, Egypt Menoufia Univ, Dept Surg, Shebin El Kom, Egypt Menoufia Univ Shebin El Kom Egypt Univ, Dept Surg, Shebin El Kom, Egypt
Titolo Testata:
ARCHIVES OF ANDROLOGY
fascicolo: 1, volume: 44, anno: 2000,
pagine: 77 - 83
SICI:
0148-5016(200001/02)44:1<77:MOEDEI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PENILE ERECTION; HEMODYNAMICS; MUSCLES;
Keywords:
ejaculation disorders; emission; reflex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Shafik, A 2 Talaat Harb St, Cairo, Egypt 2 Talaat Harb St Cairo Egypt2 Talaat Harb St, Cairo, Egypt
Citazione:
A. Shafik e O. El-Sibai, "Mechanism of ejection during ejaculation: Identification of a urethrocavernosus reflex", ARCH ANDROL, 44(1), 2000, pp. 77-83

Abstract

The ejaculatory mechanism involves 2 reflexes: the "glans-vasal," which seems to bring the semen to the posterior urethra (emission phase of ejaculation), and the "urethromuscular" which ejects it to the exterior (ejection phase). This study investigated the mechanism of bulbocavernosus muscle (BCM) contraction, once the seminal fluid reaches the bulbous urethra. The study included 14 healthy male volunteers (mean age 37 +/- 10.2 SD years). To test the response of the BCM to urethral distension, a 10F balloon-tipped catheter was introduced into the prostatic urethra and filled with saline in increments of 0.25 mt: a needle electrode recorded the response. The balloon was then withdrawn to lie in the membranous, bulbous, and pendulous urethra and the test was repeated at each sire. The latency of the muscle response was calculated. The BCM response to each of the anesthetized bulbous urethra and anesthetized BCM was recorded. Distension of the prostatic, membraneous, or pendulous urethra effected no BCM EMG response. Bulbous urethral distension with 0.25 mt of saline also produced no muscle response. whereasdistension with 0.5 mL and up to 1.5 mL caused increased EMG activity of the BCM. The muscle response augmented with the increase of the distending volume. The mean latency was 10 +/- 1.3 ms and showed no significant change (p >.05) with the different distending volumes. Neither the anesthetized bulbous urethra nor the anesthetized BCM responded to bulbous urethral distension. The BCM contraction upon distension of the bulbous urethra is probably reflex and mediated through the urethrocavernosus reflex. Small-volume distension did not effect BCM contraction. The latter presumably propels the semen from the posterior to the pendulous urethra. It is suggested that theurethrocavernosus reflex be included in current andrologic investigations for patients with ejaculatory disorders.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 09:43:57