The above image shows a magnified view of the middle portion of the large intestinal roundworm. Except for the thin, non-muscular intestine (1), most of the internal organs are given over to reproduction. In females, a short vagina (2) leads from the genital pore to  a point where it splits into  two large uteri (3).  Each uterus continues to highly coiled oviducts (4) that eventually terminates in thread-like ovaries (shown on the next page).