Pig Uterus Lab

Name:_____________________________________________ Date:_______ Living Environment Lab Fetal Development Materials: Pregnant pig uterus Gloves

Scalpel Forceps

Tray Magnifier

Procedure: 1. Put on a pair of gloves 2. Bring your tray to your teacher, so that you can obtain a specimen and a scalpel 3. At you lab station, handle the uterus—you should be able to feel the fetus inside 4. In order to examine the uterus—you will need to make and incision in the

Be careful to not cut too deeply, other wise you will destroy the sac that the fetus is floating in. uterus.

5. Using light pressure, make an incision in the uterus. The incision should be a little longer that the length of the fetus 6. Without removing the fetus, gently rinse out the insides of the uterus

7.Carefully lift the fetus out of the uterus —do not break the sac 8. Examine the membranes surrounding the fetus, think about its function 9. Examine the umbilical cord, think about its function 10. Carefully slice open the membranes allowing the fluid to drain, think about the function of this fluid 11. Remove the fetus from the sac, and examine it. Now slice open the chest cavity and examine the heart and lungs 12. Return the scalpel to your teacher 13. Place the specimen in the garbage supplied by your teacher 14. Clean you tray and lab station 15. Throw our gloves into the garbage

Questions 1. Where in the pig’s reproductive system did fertilization occur? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 2. Where does the embryo get implanted for development? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 3. Explain the difference between internal and external fertilization. Which one does the pig carry out? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 4. Give the name and describe the function(s) of the fluid that directly surrounds the developing embryo. ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ 5. How does the developing embryo get necessary materials and get rid of waste products? ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________