part of part of contributes to morphology of male urethra prostatic urethra male organism mucosa of prostatic urethra urethral crest male urethral crest Narrow longitudinal fold of mucosa on the posterior wall of the male urethra, extending from the uvula of the bladder through the prostatic urethra; when distended, it may serve to prevent the passage of the semen backward into the bladder; on either side of the male urethral crest is a slightly depressed fossa, the prostatic sinus, the floor of which is perforated by the orifices of the prostatic ducts from the lateral lobes of the prostate; the ducts of the middle lobe open behind the crest; at the forepart of the crest, below its summit, is a median elevation, the colliculus seminalis, upon or within the margins of which are the orifices of the prostatic utricle and the slit-like openings of the ejaculatory ducts[MP]. FMA:85270 urethral crest of male SCTID:279470007 UBERON:0012297 urethral crest (male)