Procedure A External Features

1. Fetal pigs usually are embalmed with a mixture of propylene glycol, formaldehyde, and phenol, which prevents microorganisms from causing the tissues to decompose. However, because fumes from this embalming fluid may be annoying and may irritate skin, be sure to work in a well-ventilated room and wear disposable gloves to protect your hands. If your fetal pig has an incision in the neck, it marks the location where colored latex was injected into the blood vessels. Rinse the pig off before the dissection begins.

Martin: Human Anatomy I 24. Fetal Pig Dissection: I Text I © The McGraw-Hill and Physiology Musculature Companies, 2002

Figure 24.1 External features of a fetal pig, lateral view.

Knee-> Shoulder

Thigh

Tail Ankle

Umbilical cord

Figure 24.1 External features of a fetal pig, lateral view.

Knee-> Shoulder

Thigh

Tail Ankle

Fetal Pig Mammary Papillae

Mammary papillae

Wrist

Eyelid

Rostrum Tongue — Arm

-Forearm

Mammary papillae

Wrist

Posterior

Anterior

Ventral

2. Obtain a preserved fetal pig, a dissecting tray, a set of dissecting instruments, a large plastic bag, twine, and an identification tag.

3. If the fetal pig is in a storage bag, dispose of any excess embalming fluid in the bag, as directed by the laboratory instructor. However, you may want to save some of the embalming fluid to keep the fetal pig moist until you have completed your work later in the year.

4. If the fetal pig is too wet with embalming fluid, blot the pig dry with paper towels.

5. Study figure 24.1 and locate the following external features:

auricle tongue external nares rostrum (snout)

eyelid shoulder arm elbow forearm wrist digits hip thigh knee leg ankle umbilical cord tail mammary papillae anus

6. Study the external features of a male and a female pig (fig. 24.2) by comparing your pig to others in the laboratory. Identify the following:

male urogenital orifice scrotum mammary papillae

Figure 24.2 External features of a male and female fetal pig, ventral view.

Figure 24.2 External features of a male and female fetal pig, ventral view.

Internal Nares Anatomy

female genital papilla urogenital orifice mammary papillae

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Responses

  • Andrew
    What are fetal pigs are embalmed in?
    2 years ago

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