![]() Study the ventral surface of the pig and note the tiny bumps called mammary papillary. The two smaller openings are the umbilical arteries which carry blood from the fetus to the placenta. The largest is the umbilical vein, which carries blood from the placenta to the fetus. ![]() Examine the 3 openings in the umbilical cord. With scissors, cut across the cord about 1 cm from the body. Count and record the number of toes and the type of hoof the pig has. Study the pig’s appendages and examine the pig’s toes.Locate the eyelids and the external ears or pinnae. Use the length/age chart on this sheet or the inside cover of your dissection manual to determine the age of your fetal pig & record this. Measure your pig’s length from the tip of its snout to the base of its tail and record this on your hand-in. A fetal pig has not been born yet, but its approximate age since conception can be estimated by measuring its length.Also locate the anterior and posterior ends. Lay the pig on its side in the dissecting pan and locate dorsal, ventral,& lateral surfaces. Obtain a fetal pig and rinse off the excess preservative by holding it under running water.Watch your time and be sure to clean up all equipment and working area each day before leaving. ***Wear your lab apron and eye cover at all times. You may have to refer to more than one dissection manual to answer all the questions so trade and share with other dissection groups. Pre-lab: Before observing internal or external structures of the fetal pig, use your dissection manual, textbook, and dissection notebook to answer the pre-lab questions on the fetal pig. Materials: preserved fetal pig, dissecting pan, dissecting kit, dissecting pins, string, plastic bag, metric ruler, paper towels Compare the functions of certain organs in a fetal mammal with those of an adult mammal.Identify major structures associated with a fetal pig’s digestive, respiratory, circulatory, urogenital, & nervous systems.Identify important external structures of the fetal pig anatomy.Also, fetal pigs are a byproduct of the pork food industry so they aren’t raised for dissection purposes, and they are relatively inexpensive. The dissection of the fetal pig in the laboratory is important because pigs and humans have the same level of metabolism and have similar organs and systems. The placenta is the source of food and oxygen for the fetus, and it also serves to get rid of fetal wastes. 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. Mammals are vertebrates having hair on their body and mammary glands to nourish their young.
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