Before entry of sperm into ovum

Simultaneously with first cleavage

After entry of sperm but before fertilization

After fertilization

Seminiferous tubules $$ \to $$ Vasa efferentia $$ \to $$ Epididymis $$ \to $$ Inguinal canal $$ \to $$ Urethra

Testis $$ \to $$ Epididymis $$ \to $$ Vasa efferentia $$ \to $$ Vas deferens $$ \to $$ Ejaculatory duct $$ \to $$ Inguinal canal $$ \to $$ Urethra $$ \to $$ Urethral meatus

Testis $$ \to $$ Epididymis $$ \to $$ Vasa efferentia $$ \to $$ Rate testis $$ \to $$ Inguinal canal $$ \to $$ Urethra

Seminiferous tubules $$ \to $$ Rete testis $$ \to $$ Vasa efferentia $$ \to $$ Epididymis $$ \to $$ Vas deferens $$ \to $$ Ejaculatory duct $$ \to $$ Urethra $$ \to $$ Urethral meatus

hCG, hPL, progestogens, prolactin

hCG, hPL, estrogens, relaxin, oxytocin

hCG, hPL, progestogens, estrogens

hCG, progestogens, estrogens, glucocorticoids

ectoderm and mesoderm

endoderm and mesoderm

mesoderm and trophoblast

ectoderm and endoderm