Male external genitalia

The genital tubercle lengthens to form the phallus. Both urethral folds and urethral groove become lengthened and deepened ventrally. The tip of the genital tubercle becomes the glans penis. Due to the formation of a circular furrow, the corona glandis, the glans is demarcated from the body of the penis. The foreskin, preputium penis, results from an epithelial proliferation forming a cuff. At the end of month 3, the urethral folds join to form the urethra (pars spongiosa). The fusion of the urethral folds occurs in a proximal to distal direction. In this way, the opening of the urethra is shifted forwards on the ventral aspect of the penis. An epithelial cord grows from the glans penis towards the urethral lumen, and later forms a channel. Thus, the urethra ends into the tip of the glans penis. The labioscrotal folds join in the middle (raphe), and thus forms the scrotum.