Procedure Bskin Removal

1. Remove the skin from the fetal pig. To do this, follow these steps:

a. Place the fetal pig in the dissecting tray with its dorsal side down.

b. Use a sharp scalpel to make short, shallow incisions through the skin as illustrated in figure 24.3. Note that the incisions are different for the male and female in the genital regions.

c. Your incisions should encircle the neck, wrists, ankles, and the urogenital regions. Note that more skin is left attached on the male pig in the urogenital region.

d. Use a blunt probe to separate the skin from the muscles. Observe the loose connective tissue (superficial fascia) that binds the skin to muscle. As you pull the skin away, you may note a thin sheet of skeletal muscle attached to it. These are cutaneous muscles and they function to move the skin to get rid of any irritants. Humans lack cutaneous muscles, but a similar sheet of muscle (platysma) is present in the neck of a human.

e. As you remove the skin, work toward the dorsal surface, then work toward the head, and finally work toward the tail. Pull the skin over each limb as if you were removing a glove. f. After the skin has been pulled away, carefully remove as much of the remaining connective tissue as possible to expose the underlying skeletal muscles. This task only needs to be performed on the right side and ventrally so you can study the muscles. The muscles should appear light brown and fibrous.

2. After skinning the fetal pig, follow these steps:

a. Discard the tissues you have removed as directed by the laboratory instructor.

b. Wrap the skin around the pig to help keep its body moist, and place it in a plastic storage bag.

c. Write your name in pencil on an identification tag, and tie the tag to the storage bag so that you can identify your specimen.

3. Observe the recommended safety procedures for the conclusion of a laboratory session.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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