Fetal Pig Dissection

The fetal pig our group is working on was not killed for this 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.

Anatomical Directions Ventral (inferior) Posterior (caudal) Anterior (cranial) Anatomical Directions Lateral Median Sagittal Transverse Frontal (coronal) Distal Dorsal (superior) Proximal

Lumbar region Mammilary papillae tail ankle Umbilical cord

How many pairs of mammary papillae do you count? 7 ½ pairs 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 Only the 2nd, 3rd, and 4th digits touch the ground. The 1st is nonexistent and the 5th never touches it. 2nd/3rd Digits 4th Digit

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 Parotid Gland 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

Opening to Naso-Parynx Nostril Oral Cavity Hard Palate Soft Palate Epiglottis Opening to Naso-Parynx Corner of Mouth (cut surface) Tongue Papillae of Tongue

Opening to Naso-Pharynx Canine Tooth Hard Palate Corner of mouth Soft Palate Opening to Naso-Pharynx Opening to Trachea Mandible Epiglottis

Stomach Liver L. I. S. I. Umbilical Artery

Kidney, Spleen, Ceacum, and Stomach not shown L.I. Liver Umbilical Artery S.I. Urinary Bladder Kidney, Spleen, Ceacum, and Stomach not shown

Stomach Pancreas L.I. Liver S. I.