The External Anatomy
Step:
1. Put on safety goggles gloves and lab
apron
1. Put on safety goggles gloves and lab
apron
2. If necessary, turn the specimen in the disecting tray, so it is on its side
with its legs pointing to you.
with its legs pointing to you.
3. Locate the eyes, eyelids, ears, and nares in the head region.
4. Locate the thoracic and abdominal regions of the trunk.
5. Feel the thick, thread-like body hair (or bristles).
5. Feel the thick, thread-like body hair (or bristles).
6. Turn the animal bentrial side up as shown to the left. Locate the teates (nipples of the mammary glands) and the umbilical cord. Using scissors, cut the umbilical cord near where it joins the abdominal wall. In the umbilical cord, locate two umbilical arteries and one umbilical vein.
7. Try to locate the scrotal sac between the hind legs. The sac may or may not contain the fully descended testes. The absence or presence of a scrotal sac can be used to determine the sex of your specimen. This specimen is female because there is no scrotal sac present.
8. Locate the urogenital opening. In the male the opening releases both sperm and urine from the body. However, in the female the urogenital opening is located immidiatly ventral to the anus. Lift the tail to locate the anus.
9. Locate the hoof, hand, wrist, forearm, upper arm, and shoulder of a forelimb.
10. Locate the hoof, foot, ankle, leg, and thigh of a hind limb.
11. Shortly before the end of the period clean up your lab station and put your disection tray and instruments in a safe place so that you can start from where you left off tommorrow.
10. Locate the hoof, foot, ankle, leg, and thigh of a hind limb.
11. Shortly before the end of the period clean up your lab station and put your disection tray and instruments in a safe place so that you can start from where you left off tommorrow.