Also locate the anterior and posterior ends. Blood passes through open sinuses in the spleen, rather than being confined to narrow blood vessels. The two kidneys are not actually located in the abdominal cavity; they occupy another coelomic compartment dorsal to the abdominal cavity. Wrap the pig in damp paper towels and put it in a zip-lock plastic bag. The abdominal cavity is now exposed. Notice the umbilical vein connecting the umbilical cord with the liver. These are part of the coronary circulation, a set of arteries and veins whose only job is to nourish the heart tissue.
The respiratory… Roy Levin Bio 11 Lab Dr. Run the string under the tray, pull it tight, and tie it to the other front limb. The largest is the umbilical vein, which carries blood from the placenta to the fetus. Trace the oviducts toward the posterior to find that they merge at the uterus. I have switched to because it provides more of a barrier from harsh chemicals, but they are slightly more expensive. Digestion occurs in the duodenum and involves many different enzymes that break down the nutrients even more.
This experiment allowed biology students to learn, in a hands-on way, about the many systems of the body. It sits to the right of the small intestine, just below the stomach. Also it is a blood reservoir that supplies the body with blood in emergencies like a large cut; it is the place where white blood cells trap and capture foreign organisms. Its main function is to absorb water, minerals and salts that were missed in the small intestine. Enjoy it for the pictures. Pulmonary trunk: Begins at right ventricles. When you have completed your observations, close the lower jaw by wrapping a single rubber band around the snout.
The dissection activity was part of the training for the program at the Cherry Hill campus of the Harris School. A 1980 study found that exposure to formaldehyde could possibly cause nasal cancer in rats, leading to research on whether this was possible in humans or not. The three animals have some similarities and differences. The penis of the fetal pig is actually pretty difficult to find because it is internal this can lead for much hilarity in the lab as students try to locate the structure. Our primary aim was to demonstrate the different techniques needed to isolate biosynthetic auxotrophic mutants using chemical, physical and transposon mutagenesis.
Cut the umbilical vein which extends through the liver. Circulatory system Mammalian hearts have four chambers see Campbell, p. Cut a semi-circle around the umbilical cord on each side. Open the mouth as you make your cut and follow the curvature of the tongue to avoid cutting the roof of the mouth. Locate the eyelids and the external ears or pinnae. Leave stubs of the vessels on the heart and identify them.
Fetal pig dissection guide: including sheep heart, brain, and eye. Learning anatomy and physiology is one of the basic building blocks for becoming a medical assistant. Use it carefully and always cut away from yourself. It is a thin finger-like organ lying on the stomach and matching it in color. Be sure to keep the tips of your scissors pointed upward because a deep cut will destroy the organs below.
Repeat with the back legs. It performs several functions related to producing and maturing new blood cells and eliminating old ones. Lungs The thoracic cavity is divided into left and right pleural cavities containing the lungs. Clean up your materials and work area. Use the labeled picture to identify the feathery papillae taste buds on the edges of the tongue, the ridged hard palate in the roof of the mouth with the smooth soft palate behind it, the sharp teeth near the front of the mouth, and the epiglottis, which covers the opening of the trachea windpipe so food cannot enter.
You will recall that papillae are the home of many microscopic taste buds. You might see either of the two specimens shown on this page, or a dissected specimen like the one you examined in lab. Why fetal pigs are good dissection specimens. Gall Bladder: The gall bladder is a small sac behind the liver that stores the bile made in the liver. The rate at which these folds increase is negatively related to fetus size. The cells begin to specialize by day six, and attach themselves to the uterus lining by day eleven.
Other remaining wastes remain in the fetal pig until birth. Remove this membrane to study the heart. In , fetal pigs are preserved by means of , and are used as an ingredient in , a local. The thoracic cavity is protected by the rib cage and contains the lungs and heart. A pig heart and a human heart are similar in their size, structure, and function.
It forms into the skin, nervous system, enamel of the teeth, lining of the intestine, mammary and sweat glands, hoofs, and hair. Locate the two umbilical arteries that carry blood from the fetal pig to the placenta, and the single umbilical vein that delivers nutrient-rich blood back to the fetal pig. Depending on the class, I may or may not allow them a word bank. By studying the systems of the pig, it helps understand the systems of the humans because humans and pigs are both mammals which we can assume that systems of pig and human are similar. If time remains continue with part B, the digestive tract. The pig is more advanced, students should have a basic understanding of dissection protocols. The first lymphatic organ to become present is the thymus.