phallus

The phallus is a term that can refer to a symbol or representation of the penis, or to the penis itself. During embryonic development, both males and females initially develop neutral structures that have the potential to become either male or female genitalia. This is known as the indifferent stage.123

In males, the genital tubercle and urogenital folds combine to form the penis, which carries the urethra to its end. The genital swellings fuse to become the scrotum. The penis develops from an outgrowth called the genital tubercle, which is located at the anterior edge of the urinogenital orifice. In male embryos, this tubercle encloses the urethral canal and becomes the penis. The development of these structures is influenced by genetic and hormonal factors, particularly testosterone, which is secreted by the fetal testes.3425