The fetal pig anatomy and human anatomy are similar because both are mammals. Humans and fetal pigs have the same major structures, with some slight differences in the details. Fetal pigs are dissected to study human anatomy.
Fetal pigs and humans have the same muscles with differences in location and size, because pigs have four legs and humans have two legs. Both humans and fetal pigs have the thoracic and abdominal organs with some differences. Some examples of these differences are the human liver has four lobes and the fetal pig liver has five lobes, the pig colon is spiral, and adrenal glands in pigs are near the aorta and in humans they are on top of the kidneys.