part of part of intersects midsagittal plane of has quality has quality continuous with continuous with develops from develops from ridged scrotum mesoderm-derived structure reproductive structure septum of scrotum embryonic urethral groove raphe of scrotum FMA:75130 SCTID:279583006 UBERON:0017732 scrotal raphe The scrotal raphe is formed when the embryonic, urethral groove closes (week 12 in humans) A ridge of tissue that extends along the midline of the scrotum. external soft tissue zone raphe of perineum