abnormal male urethra morphology abnormal urethral crest morphology abnormal male urethral crest morphology 2012-11-30T03:36:23Z MP:0011841 MPheno.ontology abnormal crista phallica morphology abnormal crista urethralis masculinae morphology abnormal urethral crest of male any structural anomaly of the 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 csmith