Anatomy/Physiology Name Due Hour Fetal Pig Dissection Materials Salety Preserved

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Anatomy/Physiology Name Due Hour Fetal Pig Dissection Materials Salety Preserved Fetal Pig Paper Towels Dissecting Pan Meter Stick Scissors Gloves Scalpel Wear disposable gloves throuphout the lh Wear goggles during the entine lab Store pigs as directed by your teacher Wash your hands before leaving the lb Forceps String All mammals have certain stractures in common. By studying the anatomy of the fetal pig much can be learsod ahout other mammals, such as hm Although the eternal structures of the pig soem very different in appearance form these of·hmu·bot species have ?tain conceneri- internal structures Comparisons of these two species shew any external similarities. The bodies of a pig and a human can both be divided into the bed neck, thorax abdomen, and limb regions. The internal organ systems of the pig and human are very similar in structure and funcsion Procedure: A. Obeain a fetall pig, rinse it off with water and place it on its side in the dissecting pas. (Put paper towels in the botoiom of the p) B. The pig is a member of the group of mammals known as even-toed ungulates. It is Genus Sus, and Species scrofa 1. What is an ungalate? 2 What are the Kingdom, Phylum, and Class of the pig? 3. What is its scientific name? C. You well be examining several characteristics of an unborn animal. The period of gestation for the pig is 112-115 days 4. What is meant by gestation? D. The age of the fetus can be estimated by measuring the body length from the tip of the smout to the atachment of the tail Place a piece of string from the tip of the snout to the attachment of the tail. Then measure the string on a meter stick Compare this length to the dasa pven on relatrve sises of a Seal pig at different times during gestation. 21 days-11 mm 35 days- 17 mm 49 days-28 mm 56 days -40mm 100 days-220mm 115 days-300mm 5. What is the approximate age of your specimen? E. Observe that the body is divided into head, neck, trunk, and tail. The trunk is divided into the thoracic (chest) and abdominal (stomach) repions The pig's body exhibits bilateral symmetry. Examine the umbilical cord. Identify the two small arteries and the one large vein that are found in the cond 6. How does a fetus get rid of its waste products? F. Examine the head, noting that the eyes have upper and lower lids 7. How many digits are present? H. Determane the sex of your specimen. The male is identified by the presence of a swelling, the scrocal sac, at the posterior end of the body between the ends of the hind legs and by the presence of the urogenital opening just posterior to the umbilical cord. In the female, the urogenmital opening is upper situated immediately ventral to the anal opening. A small fleshy genital tubercle projects from the urogenital aperture. In both the male and female, there are two rows of mammary papillae on the lae or teats on the ventral surface of the abdomen with 5-7 mipples in each row 8. What is the sex of your specimen? Internal Anatomy: L. In the dissection and observations of the internal organs, you will proceed by systems and remove organs only when directed to do so Respiratory, Circulatory, Digestive, Nervous, Reproductive, and Excretory Thoracie Cavity: .Saudy and use dissect, keep in mind the interelationships of systems ying diagrams to aid in your observation of the intermal organs. As you dissect, keep in mind the inserelationshigs of systs ing up. Tie one end of,length of string to the ankle ofafrel mbofthe pigLt?be dissecting pan, and pass the string underneath the pan. Then tighdy tie the other end of the string to the ankle of the other forelimb he hind limbs. pg in the dissecting pan with its ven ral side f Repeat this step with

Explanation / Answer

B. 1. Ungulates are quadruped mammals that are hoofed.

2. Kingdom of pig - Animalia

Phylum of pig - Chordata

Class of pig - Mammalia

3. Scientific name of pig is Sus scrofa scrofa

C.4. Viviparous animals carry fetus or embryo in their uterus from conception to delivery. This is known as gestation.

E. 6. Through the blood vessels present in the umblical cord and placenta, fetus sends back the waste products and carbon dioxide into mother's blood circulation from where they are eliminated.

G.7. Fetal pig has 4 digits on each foot.

Since length of the fetal pig and observations regarding the sex of the pig fetal specimen are not provided, the questions D.5 and H.8 could not be answered.

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