Fetal Pig Dissection
Shalae Mitchell
Amber Burnett
Jennifer Taylor
2-17-05
ID Marker: Penny
• The fetal pig our group is working on was not
killed for this. It was found in a sow marked for
slaughter, and was never born. It was then given
to us for use in science.
• Sus scrofa is the technical name of the domestic
pig. They eat both plants and animals. Their
body temperature is slightly higher than humans.
They live 15 to 20 years. Pigs are often used in
experiments on human drugs. There is a new
“mini-pig” that weighs 100-150 lbs. especially for
that use.
• During gestation, there is an exchange of
substances between the blood of te mother and
of the embryo across the placenta through the
umbilical cord.
Our pig is 34 cm long, and was 112-115 days old at birth, which is full term.
Ventral (inferior)
Posterior (caudal)
Anterior (cranial)
Lateral
Median
Sagittal
Frontal (coronal)
Transverse
Distal
Dorsal (superior)
Proximal
Lumbar region
tail
Mammilary papillae
ankle
Umbilical cord
Our fetal pig is male.
How many pairs of mammary papillae do you count?
7 ½ pairs
Do all specimens in class have the same amount?
No
Pig Toes
2nd/3rd
Digits
4th Digit
Only the 2nd, 3rd, and 4th digits touch the
ground. The 1st is nonexistent and the 5th
never touches it.
Pig Dissection Notes
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Use scalpel sparingly
Rely primarily on your dissecting needles.
Leave organs intact unless directed to do otherwise.
When using scissors, walk w/the blunt end out.
Move organs aside w/your fingers or a blunt probe.
Apply lanolin or Vaseline at the outset or wear thin rubber gloves.
Line your dissection pan w/paper towels in order to absorb excess
fluids, as a storage for structures removed, and to ease cleaning up
at the end.
• Wrap the fetal pig in wet paper towels before returning it to the bag.
• Twist the top of the bag and close tightly w/a rubber band.
• Apply the following solution w/a one inch paint brush at the close of
each session to preserve the softness and texture of the pig: 30
grams of Carbolic Acid crystals, 250 ml. of Glycerin, and 1000ml of
Water.
Salivary Glands
Parotid Gland
Masseter Muscle
Facial Nerve, Dorsal Branch
Facial Nerve, Ventral Branch
Submaxillary Gland
External Maxillary Vein
Stensen’s (Parotid) Duct.
Teeth
3/3 Incisors
1/1 Canines
4/4 Premolars
0/0 Molars
Nostril
Oral Cavity
Hard Palate
Soft Palate
Epiglottis
Corner of Mouth
(cut surface)
Tongue
Papillae of Tongue
Opening to Naso-Parynx
Canine Tooth
Hard Palate
Corner of mouth
Soft Palate
Opening to Naso-Pharynx
Mandible
Opening to Trachea
Epiglottis
Stomach
Liver
L. I.
S. I.
Umbilical
Artery
Liver
L.I.
Umbilical Artery
S.I.
Urinary Bladder
Kidney, Spleen, Ceacum, and Stomach not shown
Stomach
Pancreas
L.I.
Liver
S. I.
Page 56, #1 – 9
1. Divisions of pharynx: nasopharynx, oropharynx, and the
laryngopharynx/hypopharynx.
2. 7 passages that penetrate the pharynx: mouth and nasal passages,
Eustachian tubes, larynx, esophagus, glottis, and pharyngeal area,
•
4 types of papillae found on the surface of the tongue: sweet, sour, bitter,
salty. Differences: They react to different molecules of food.
•
Bones of the hard palate: palatine rugae
•
Other than the palatine tonsils, the other tonsils are: lingual and pharyngeal.
•
Secretions from the salivary glands begin the digestion of : food
•
The esophagus is located: c) dorsal to the trachea
•
A major blood vessel that is formed just posterior to the submaxillary gland
as a result of the union of smaller vessels is external maxillary gland is the
submental branch of the Facial artery (off of the External Carotid artery)
•
The cap of cartilage which prevents food from entering the trachea while
swallowing is the epiglottis.
Page 66 #1-9
1. Lobes of the Liver: left, right, lateral, medial
2. Structures of the greater and lesser omentum:greater is from above
stomach and below transverse colon and the lesser is covers and supports
various organs and blood vessels.
3. Jejunum:8 ft. long Ileum: 12 ft. long
4. Location and function on ileocecal valve: separates the last part of the
small intestine and the first part of the large intestine keeps food in the S.
I. until digestion is complete.
5. Parts of the alimentary canal: mucosa, submucosa, muscularis, and the
adventitia.
6. *Location of the adrenal gland: Pig - above kineys Human - on top of
kidneys.
7. Digestion of fats begin in the small intestine.
8. 3 major tubular structures in the diaphragm: the aorta, the esophagus
and the posterior vena cava
9. The trachea is not in the abdominal cavity.
Computer: Jennifer Taylor
Photographer: Shalae Mitchell
Dissector: Amber Burnett