Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
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...