7. Trace the pathway of a sperm from the male testis to its exit from the body. Why are testes best kept outside of the body (in an external scrotum)? Why are the Sertoli cells important to sperm formation? 8. Trace the pathway of an egg once it has been ovulated from the ovary to the exterior of the body in a non-pregnant woman. Identify three "barriers" to sperm within the female reproductive tract.