Background Information - Fetal Pig Dissection (female) · It body has bilateral symmetry. · Its body is composed of four regions – a head, neck, trunk, and tail. · The trunk, which has two pairs of appendages, can be subdivided into the thorax and abdomen. · The head contains two eyes, eyelids, and ears. · The snout area contains the nares (nostrils) and the mouth. · The legs are very similar to those of many other four-legged mammals. Fetal Pig Dissection and Fetal Pig Anatomy - BIOLOGY JUNCTION Fetal Pig Dissection Background: Mammals are vertebrates having hair on their body and mammary glands to nourish their young. The majority are placental mammals in which the developing young, or fetus, grows inside the female’s uterus while attached to a membrane called the placenta.