prostatic urethra

(redirected from Prostatic portion)

pros·tat·ic u·re·thra

[TA]
the prostatic part of the male urethra, about 2.5 cm in length, that traverses the prostate; it includes the seminal colliculus, and the ejaculatory and prostatic ducts open into it.
Synonym(s): pars prostatica urethrae [TA]

prostatic urethra

That part of the male urethra surrounded by the prostate gland.
References in periodicals archive ?
Norepinephrine (1 x [10.sup.-7] M~1 x [10.sup.-4] M) evoked phasic contractions in a concentration-dependent manner in both the epididymal portion (0.04 [+ or -] 0.01, 0.15 [+ or -] 0.01, 0.39 [+ or -] 0.04 and 0.53 [+ or -] 0.04 g) and the prostatic portion (0.01 [+ or -] 0.01, 0.08 [+ or -] 0.01, 0.35 [+ or -] 0.05 and 0.53 [+ or -] 0.04 g) of isolated mouse vas deferens.
The phasic contraction induced by KC1 (56 mM) was increased by paeoniflorin (1 x [10.sup.-4] M) in the epididymal portion, but had no effect in the prostatic portion of isolated mouse vas deferens (Fig.
In the prostatic portion of vas deferens, the phasic contraction induced by norepinephrine results from the release of intracellular [Ca.sup.2+] stores, and the tonic contraction results from extracellular [Ca.sup.2+] influx (Burt et al., 1998; Vesperinas et al., 1989).
Table 2 Effects of various drugs on veratrine (VR 1 x [10.sup.-5] g/ml)-induced contraction in the prostatic portion of isolated mouse vas deferens.
The concentration induced by veratrine (1 x [10.sup.-5] g/ml) was completely inhibited by [Ca.sup.2+]-free solution and verapamil (1 x [10.sup.-5] M), in both the epididymal and the prostatic portions of isolated mouse vas deferens.
Paeoniflorin (1 X [10.sup.-4]-1 X [10.sup.-2] M) or veratrine (1 X [10.sup.-5]-1 X [10.sup.-3] g/ml) were administered alone, to the epididymal and prostatic portions of isolated mouse vas deferens in the organ bath.
Paeoniflorin (1 x [10.sup.-4] x [10.sup.-2] M) had no effect on isolated rat and mouse vas deferens (data are not shown), but veratrine (1 x [10.sup.-5]-1 x [10.sup.-3] g/ml) induced contraction of both the epididymal and the prostatic portions of isolated mouse vas deferens (Fig.
Paeoniflorin (1 x [10.sup.-4]M) decreased the contraction induced by veratrine (1 x [10.sup.-5] g/ml) in both the epididymal and the prostatic portions of isolated mouse vas deferens at 0-12 min.
Ryanodine (1 x [10.sup.-5] M) decreased the contraction induced by veratrine (1 x [10.sup.-5] g/ml) in both the epididymal and the prostatic portions of isolated mouse vas deferens (Fig.
Various concentrations of veratrine (1 x [10.sup.-5] g/ml~1 x [10.sup.-3] g/ml) evoked contraction of both the epididymal and the prostatic portions of isolated mouse vas deferens in a dose-dependent manner.