2010 Pig Dissection Step One – 6/1 Answer the 13 questions on the next slide on a sheet of paper Label the pig diagram worksheet Label the diagram of the cat skeleton on the worksheet with the bones listed on slide #4 Put it all into a manila folder with your name on it; this will be your “Pig Journal” 1. Where are fetal pigs obtained? 2. How many pigs are usually found in a litter? 3. What is the accepted method for determining the age of a fetal pig? 4. What is the genus and species of the domestic hog? 5. Pigs belong to the order Artiodacyla. What are some animals that are closely related to the pig? 6. What type of diet do pigs eat? 7. How long do pigs usually live for? 8. Why is a pig a better specimen to study than a frog or fish in human anatomy? 9. What are two major distinguishing characteristics of mammals? 10. Define the following- Anterior Lateral Posterior Medial Dorsal Proximal Ventral Distal 11. What are the three planes of the body? 12. What is the difference between digitigrade and plantigrade locomotion? 13. How can you determine a male pig from a female pig? Carpals Patella Femur Phalanges (Digits) Sacrum Radius Fibula Scapula Humerus Sternum Maxila Tarsals Metacarpals Tibia Metatarsals Ulna Nasal Bone Vertabrae Orbit Step Two – 6/2 Obtain a pig and record all of the following information on a separate sheet of paper Number your papers in the top right-hand corner in chronological order Determine the age and sex of your pig Name the pig Observe all of the external anatomy found on the worksheet from yesterday -> Step Two – 6/2 Read pages 18 – 22 We will be observing the external muscles first Follow the instructions on page 20, and make the cuts found on page 22 Skinning the pig will probably take between 2 - 4 days. It is very important to go slowly and do good work The best technique is to use a blunt probe or your finger, rather than a scalpel Step Three– 6/3 Continue to skin the pig, as per Day Two instruction When finished, let me know so I can observe and sign off on completion Once finished, it is time to observe the superficial muscles You will be responsible for the muscles on the next slide… You will be “pinning” and recording the functions of each muscle in your journal Take your time and label each pin with a piece of tape with a number Record procedures and observations in journal Be sure to date and number each page, keep papers in chronological order These muscles are superficial, and there is no need to make any incisions for this portion of the dissection Ventral muscles Lateral Muscles 1. Pectoralis major 9. Deltoid 2. Latissimus dorsi 10.Intercostal 3. External oblique 11.Triceps brachii 4. Rectus abdominus 12.Gluteus maximus 5. Sartorius 13.Biceps femoris 6. Brachiocephalic 14.Semitendinosis 7. Sternomastoid 15.Semimembranosus 8. Sternohyoid 16.Gastrocnemius 17.Soleus Step Four– 6/4 After completing the muscles, you will move on to the oral cavity. Read pages 52-53 and record the following information in your notes- The nine bold vocabulary words and a brief description of each Identify the dental formula in fetal pigs and explain what it means Comment on how it differs from humans Proceed to cut the jaw line and identify the structures shown on pages 54 – 55. Be prepared to show these to me. Step Five Once you’re done with oral cavity, move on the abdominal cavity. Read and list the function of all the organs found on page 58 – 60. Study the incisions to be made on page 61. Make the cuts 1 through 4 and open up the abdominal cavity Be gentle with the scalpel, don’t cut too deeply. After identifying what you can see without moving the organs, please make a drawing of the open abdominal cavity. Do so to the best of your ability. Label as much as you can. The final step here will consist of showing the organs to me. Step Six Once you’re done with the abdominal cavity, move on the thoracic cavity. Read and list the function of all the organs found on page 68 – 69. Study the incisions to be made on page 61. Make the cuts 5 and 6 and open up the thoracic cavity Be gentle with the scalpel, don’t cut too deeply. Identify the organs found on pages 68-69 and show them to me. Step Seven Remove the digestive system. Do so carefully as to not sever the coils of the intestines. Remove the stomach from the intestines. Cut open the stomach lengthwise and record your observations as to how it looks. What is the substance inside the stomach? Attempt to straighten out the small and large intestine. Try to get a measurement of how long is and record this information. Step Eight Remove the heart. Cut the heart open lengthwise and record your observations What are the different chambers of the heart called? Which side of the heart receives deoxygenated blood from the body? Which side of the heart pumps oxygenated blood to the body? Step Nine If female, find and observe the ovaries and uterus. Point out these structures to me. If male, carefully cut the scrotum. Find the testes and the penis. Point these out to me. Step Ten Read pages 113 – 118 in regard to dissecting the nervous system. Follow the procedures as outlined. Do so carefully. The ultimate goal is to have a pig that resembles the picture on 118. Show me your results. Carefully remove the brain and make observations. Now is the time you can do any other procedures you desire, so long as you are remaining scientific. This means you Greg. Cleanup Dispose of the pig and all remains in the trashcan. Thoroughly wash your dissecting tray and instruments.
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