![]() Figure 8.Įxtend a single cut along the midline of the ventral surface of the animal to about 2 cm. The flap of the body wall that contains the navel can be folded posteriorly to reveal the internal organs of the abdomen. Your finished cut will be anterior to the navel and along each side of the navel. Continue cutting from the anterior end of this cut so that it resembles an upside-down U. 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 figure 6. Tie one front leg of the animal with a string that passes underneath the dissecting pan to the other leg. Male: urogenital opening, penis, anus Preparation and Initial Cuts Female: genital papilla, urogenital opening, anus Figure 3. Female: injection site, nipples, umbilical cord Figure 2. 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. 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. The following words will be used to help identify the location of structures. 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. Several different pig dissections were used to obtain the photographs below. 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. Virtual Pig Dissection – collection of images and descriptions from Whitmen.The fetal pig that you will dissect has been injected with a colored latex (rubber) compound.The Ultimate Fetal Pig Dissection Review – images and links to supplement dissection.Fetal Pig Dissection Word List – listing all the structures located during the dissection.Gallery: Fetal Pig Dissection – photos from dissection with labels.Fetal Pig Dissection – Student Handout with directions, questions, and images.The fetal pig dissection takes a little longer than the frog dissection, but most of the specimens will keep for at least a week. Double-injected fetal pigs help students visualize the path blood takes through the body. In addition to structures of the digestive system, respiratory system, and urogenital system, students learn about the circulatory system. This is likely due to the fact that there are similar structures and familiarity with the terms. They usually do better on the pig than the frog. ![]() The same assessment is done after the frog dissection, so students are familiar with the process. The unit ends with a lab practical, where students identify structures on pinned pigs. ![]() In this way, students can get a detailed understanding of anatomy and how the physiology of the amphibian differs from that of a mammal. My freshman honors biology class dissects the pig a few weeks after the dissection of the frog. Many biology classes include a fetal pig dissection. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |