Epididymis consists of an expanded upper end called the head, a body and an inferior pointed tail. Laterally, between the testis and the body, there is a distinct groove lined with the inner visceral layer of tunica vaginalis and is called the sinus of the epididymis.
Epididymis is a much coiled tube. When fully stretched, it is nearly 20 ft. long. The vas deferens emerges from the tail of epididymis as a tube and enters the spermatic cord.