part_of starts_at ends_at phallic urethra of male genital tubercle of male penis penile urethra urethral seam ventral seam EMAPA:36421 The urethral seam (urseam) (syn: urethral raphe, ventral seam) (TS:24-TS:28). In the male, growth from mesenchyme ventral to the phallic urethra closes the proximal urethral meatus and septates the epithelium of phallic urethra. This results in the centrally positioned phallic urethra and the ventrally positioned urethral seam. The urethral seam is a solid epithelial cord present underneath the skin along the ventral midline of the penis. Septation moves in a proximal to distal direction along the penis during development and the urethral seam is retained in the adult penis. Part of the genital tubercle of male (TS:24), part of the penis (TS:25-TS:28) and also part of phallic urethra of male (TS:24) and penile urethra. urethral raphe anatomical_structure TS24 TS28