Insert one blade of scissors through the body wall on one side of the umbilical cord and cut posteriorly to the base of the leg as shown in the first photograph below. Tie one front leg of the animal with a string that passes underneath the dissecting pan to the other leg. Female genital papilla, urogenital opening, anus Figure 3. Female: injection site, nipples, umbilical cord. The word “urogenital” refers to an opening that serves both the urinary (excretory) and the reproductive systems. Use your pig and also a pig of the opposite sex to identify the structures in the photographs below. Use the photographs below to identify its sex. Obtain a fetal pig and identify the structures listed in the first photograph. The pig in the first photograph below has its ventral side up. The pig in the first photograph below is laying on its dorsal side. If a structure is anterior to another then it is closer to the head. The following words will be used to help identify the location of structures. Your pig may or may not have that injection. Some of the images have a pig that has been injected with a substance to show arterial flow in red and venous flow in blue. As a result, a structure shown in one photograph may look different than the same structure shown in another photograph. Several different pig dissections were used to obtain the photographs below. Identify, on your fetal pig, each structure from the labeled photographs.Successfully complete dissection of the fetal pig.Identify external urogenital structures of the male and female fetal pig.The appendix in humans is the evolutionary remains of a larger cecum in human ancestors. The cecum is large in herbivores but much of it has been lost during evolution in humans. It houses bacteria used to digest plant materials such as cellulose. The cecum is a blind pouch where the small intestine joins the large intestine. The spleen is an elongate, flattened, brownish organ that extends along the posterior part of the stomach ventral to (above) the pancreas. Lift the stomach and identify this light-colored organ. It extends along the length of the stomach from the left side of the body (your right) to the point where the stomach joins the small intestine. The pancreas is located dorsal and posterior to the stomach. Find the bile duct that leads to the small intestine. This structure stores bile produced by the liver. Lift the right lobe and find the gallbladder. Locate the cecum, a blind pouch where the small intestine joins the large intestine. Find the posterior part of the large intestine called the rectum and observe that it leads to the anus. Identify the small intestine and large intestine. Using a probe, trace follow the esophagus to the stomach. You have already seen how the esophagus leads from the pharynx through the neck region. The word “urogenital” refers to an opening that serves both the urinary (excretory) and the reproductive systems.įigure 20. Esophagus, larynx, trachea, bronchus, and lung. Obtain a fetal pig and identify the structures listed in figure 1. Use figures 1–4 below to identify its sex. The pig in figure 1 below has its ventral side up. The pig in figure 1 is lying on its dorsal side. If a structure is anterior to another, then it is closer to the head. Links to high-resolution, unlabeled photographs are also provided for many of the photographs. As a result, a structure shown in one photograph may look different than the same structure shown in another photograph.Ĭlick on any of the photographs to view enlargements. The incision can be seen in the first photograph below. An incision was made on the side of the neck to enable the injections. The arteries have been filled with red latex and the veins with blue. The fetal pig that you will dissect has been injected with a colored latex (rubber) compound.
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