part_of starts_at ends_at epithelium of dorsal pelvic urethra of male urogenital sinus ridge of male anatomical_structure The urogenital sinus ridge of male (UGS ridge) (TS:23-23) is part of the epithelium of pelvic urethra of male (TS:23). The thickened and raised, dorsal portion of the epithelium of dorsal pelvic urethra of male located at the site where the nephric ducts join the pelvic urethra. Derived from the urogenital sinus ridge, part of the pelvic urethra (TS:21-TS:22) (derived from cloacal endoderm). At TS:24, it becomes the verumontanum (syn: seminal colliculus), the protrusion of the urethra where the prostate gland and ejaculatory ducts join. EMAPA:36123 TS23