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ESCUELA ELEMENTAL Y SUPERIOR ANTOLINA VÉLEZ
UNIVERSIDAD INTERAMERICANA DE PUERTO RICO
RECINTO DE AGUADILLA
Life Science-7th grade
Mrs.I.Torres
Lab #3 Fetal Pig Dissection
Name:______________________________________
I.
Date:_________________________
PRE-LAB QUESTIONS (Make a research using the Internet-NO WIKIPEDIA)
1. What is the function of the umbilical cord?_________________________________________________
____________________________________________________________________________________
2. State the function of the following organs using your dissection guide-Internal Anatomy.
Organ
Function
Stomach
Liver
Small Intestine
Large Intestine
Gall Bladder
Pancreas
Spleen
Heart
3. Why do lungs in fetal pigs feel spongy? ___________________________________________________
_______________________________________________________________________________________
4. Define the following structures located on the pig’s heart.
a. Ventricles=____________________________________________________________________
b. Atria= ________________________________________________________________________
II.
LAB PERFORMANCE/QUESTIONS
External Anatomy
1. Infer the gender of the fetal pig by its external anatomy.
I infer that the fetal pig is (male/female) because:
______________________________________________________________________
Sex Hints
The penis and urethral opening of the male pig are located just behind the umbilical cord. If your pig is young,
the scrotal sacs may still be empty, as the testes descend just before birth. If you have a more mature male, the
testes will have descended to fill the scrotum. If the pig is female, you will notice a small projection just below
her tail. The opening just below her tail is the anus; the one below the small projection is the vaginal orifice.
2. Using the given information try to infer in what gestation period the pig is.
21 days - 11 mm
35 days - 17 mm
49 days - 28 mm
Length ________
56 days - 40 mm
100 days - 220 mm
115 days - 300 mm
Days ________
Oral Cavity
1. With a pair of scissors cut deeply into both corners of the mouth. This may be difficult as you must cut
through both tissue and bone. Open the mouth. Examine the oral cavity containing the tongue and
teeth. Notice the ridged roof of the mouth called the hard palate. The soft palate is the fleshy portion of
the roof of the mouth and lies caudal to the hard palate.
What structures could you classify?
Make a circle around it and write the structure beside the correct number.
o Tongue
o Teeth
o Soft palate
o Hard palate
o Pharynx (passage for food)
Using your dissection guide- External Features describe the following structures of the Oral Cavity
a. Tongue= ____________________________________________________________________________
b. Soft Palate= _________________________________________________________________________
c. Hard Palate=_________________________________________________________________________
Internal Anatomy
1. Using dissection needles ankle the pig to the dissecting tray.
2. Use the picture to perform the dissection cuts.
3. Locate the following internal organs:
 Trachea (tube-like structure)
 Heart
 Lungs
 Liver
 Stomach
 Large intestine/small intestine
 Urinary bladder
Observe and describe the following organs (you may use your dissection guide-Internal Anatomy to describe)
Organ
Observations
Description
Trachea
Lungs
Urinary Bladder
**Use the diagram below and the dissection guide to help you classify.**