Fetal Pig Dissection

Shalae MitchellAmber BurnettJennifer 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.

Posterior (caudal)

Dorsal (superior)

Ventral (inferior)

Lateral

Median

Proximal

Distal

TransverseSagittal

Frontal (coronal)

Anterior (cranial)

ankleUmbilical cord

Lumbar region

tail Mammilary papillae

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

• 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

Masseter Muscle

Facial Nerve, Ventral Branch

Parotid Gland

Submaxillary Gland

External Maxillary VeinStensen’s (Parotid) Duct.

Facial Nerve, Dorsal Branch

Teeth

3/3 Incisors

1/1 Canines

4/4 Premolars

0/0 Molars

Oral Cavity

Nostril

Hard Palate

Soft Palate

Opening to Naso-Parynx

Epiglottis

Corner of Mouth (cut surface)

Tongue

Papillae of Tongue

Hard Palate

Soft Palate

Opening to Naso-Pharynx

Canine Tooth

Mandible

Corner of mouth

Opening to Trachea

Epiglottis

Liver

Stomach

L. I.

S. I.Umbilical

Artery

Liver

S.I.

L.I.

Kidney, Spleen, Ceacum, and Stomach not shown

Umbilical Artery

Urinary Bladder

Liver

Stomach

L.I.

Pancreas

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.

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.

Page 66 #1-9

Computer: Jennifer Taylor

Photographer: Shalae Mitchell

Dissector: Amber Burnett