Download SBI3C - Fetal Pig Dissection Worksheet

SBI3C
Name: ____________________
Fetal Pig Dissection
(pages 256-261)
1.
2.
Instructions:
Place your pig on its side in a dissection tray. Using the
diagram of the external features of the fetal pig observe
the structures on the checklist. Note the anterior (front),
posterior (back), dorsal (upper), and ventral (lower)
surfaces of the pig.
Checklist:
__ head
__ neck
__ trunk
__ tail
Use a string and a ruler to determine the length of the
pig from the tip of the snout to the tip of the tail.
Length in mm: ___________
Estimated age (use Fig. 2 on p.257):
___________
3.
Locate the paired rows of nipples on the ventral surface
of the pig. Note the structures on the checklist. Lift the
pig's tail to locate the anus.
4.
Identify the 2 arteries and 1 large vein in the umbilical
cord.
Determine the sex of your fetal pig by locating the
urogenital opening: in females it's located just ventral to
the anus; in males it's located posterior to the umbilical
cord; scrotal sac may be visible. (See Fig. 3 on p.257)
5.
6.
Use a pair of scissors, cut through the corners of the
mouth from the opening to the posterior. Use the
diagram of the mouth to locate the epiglottis. Use a
probe to locate the structures listed.
__ umbilical cord
__ closed eyelids
__ tongue
__ external ears
__ toes
__ anus
__ umbilical cord arteries
__ umbilical cord vein
__ male?
or
__ female?
__ epiglottis
__ trachea
__ opening to esophagus
__ teeth
__ tongue
__ hard palate
__ soft palate
7.
Place your fetal pig on its back in the dissecting tray.
Use 2 pieces of string to attach the pig's limbs together
and the pig to the tray.
Use the diagram shown as your guide.
With a pair of scissors, make a small cut in the
abdomen, just in front of the umbilical cord. Insert the
tip of the scissors into the cut and then extend the cut
along line #1 until you reach the rib cage.
*Don't cut too deep...you may damage the internal
organs!*
Cut along line #3, then along line #2.
Lift up the umbilical cord, then cut the umbilical vein and
tuck the cord between the hind legs.
Extend cut #3 around to the back, and make similar cuts
at #4.
8.
9.
Fold back the flaps of the body wall and pin them to the
bottom of the tray.
Use the following diagram to locate the:
__ liver
__ diaphragm
__ spleen
__ large instestine
__ small intestine
__ end of esophagus
__ stomach
__ pancreas
__ gall bladder
Make a cut through the esophagus, just below the
diaphragm. Gently lift the stomach and intestines up out
of the abdomen. Make a second cut through the lowest
portion of the large intestine. Remove the stomach and
intestines and set down in the tray.
Using the scissors to gently cut away connective tissue,
carefully unravel the entire digestive tract.
Measure and record the length of the:
small intestine: ____________
large intestine: ____________
10 Identify the...
11 Using the scissors, extend cut #1 up through the rib
cage. Carefully cut the diaphragm to separate it from
the rib cage.
__ kidneys
__ ureters
__
__ heart
__ pericardium membrane
Locate the heart and using forceps and a probe,
carefully remove the pericardium membrane.
Identify the chambers of the heart and the direction of
blood flow.
Make a diagonal incision across the heart and expose
the inner chambers. Which chamber has thicker walls?
__ left ventricle
or..
__ right ventricle
12 Locate and identify the following...
Describe the texture of the lungs.
__ lungs
__ larynx
__ trachea
Describe the texture of the trachea. What is the function
of the cartilaginous rings?
When you are finished all of the above, you may continue to work on the dissection to discover other
systems... Please write your observations below...