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Fetal Pig Dissection! Work in Groups of 3-4 Get out lab books and lab packets!

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Presentation on theme: "Fetal Pig Dissection! Work in Groups of 3-4 Get out lab books and lab packets!"— Presentation transcript:

1 Fetal Pig Dissection! Work in Groups of 3-4 Get out lab books and lab packets!

2 Fetal Pig Dissection – Day 1 Getting Started! Obtain the following materials: 1 fetal pig per group 1 large dissection pan 2 pieces of string - ~25-30 inches long 2 good scalpels Scissors 2 BLUNT Probes Forceps (tweezers)

3 Initial Prep Open up the plastic bag – –KEEP the outer bag AND the rubber band! –Cut open the inner bag over the sink. Empty pig and contents into sink. THROW AWAY inner bag into the GREEN trash Rinse off pig well. Towel dry and place in a dissection tray

4 External Observations Look for the umbilical cord –Try to find the umbilical arteries/veins that connected its blood supply to mom via the placenta External nares (remember what those are?) Tongue Boy or Girl? –Look under the tail. If all you see it an anus (hole) then a SMOOTH swollen sac of skin – you have found the SCROTUM and you have a boy! If you see an anus (hole) plus an obvious folded area of skin. You have found the GENITAL PAPILLA and you have girl! Scrotum Anus Genital Papilla Anus BOY! GIRL!!!

5 Securing your Pig to the tray Use the 2 pieces of string to secure your pig to the dissecting tray

6 Incision Time 1. Take a scalpel – make a SUPERFICIAL midsaggital incision from chin to umbilical cord 2. Then use scissors to cut along either side of the umbilical cord to create a “flap” 3. & 4. Use scissors to make 2 lateral cuts. Avoid the staples on one side of the pig –Also be careful not to demolish the DIAPHRAGM at the base of the rib cage!

7 Incision Time 3. & 4. Use scissors to make 2 lateral cuts. Avoid the staples on one side of the pig –Also be careful not to demolish the DIAPHRAGM at the base of the rib cage! Diaphragm

8 Separate Skin from rib cage Using your scapel – separate the skin of the chest area off of the rib cage. –You will have to cut through muscle and connective tissue to do this –It’s like skinning raw chicken! Using scissors – cut of each half of the rib cage. You should end up with 2 large chunks of ribs in your tray

9 Diaphragm Use scissors to separate the diaphragm from the floor of the rib cage. You should be left with one big “flap” of Diaphragm that hangs over the liver and stomach (see d page 409 of lab book) Diaphragm

10 Exposing Larynx and Trachea – pg. 409 Using scissors – cut off any remaining pericardial sac that might be covering the heart. –Place any pieces in your tray for later disposal Using a SHARP scalpel – remove all muscle and tissue overlying the larynx and trachea Larynx Trachea

11 Neck Blood Vessels – pg. 418 Using a BLUNT PROBE – carefully probe on either side of the trachea until you expose –1 PINK common carotid artery on each side –2 BLUE jugular veins on each side These are the internal and external jugular veins Internal Jugular Vein Common Carotid Artery External Jugular Vein

12 Heart Using a combination of scalpel and scissors: –Cut off the pericardial sac that surrounds the heart –Be careful not to cut off any important blood vessels! Also not the texture and position of the RIGHT AND LEFT LUNGS. Superior Vena Cava Right Lung Left Lung

13 Cardiovascular System: Superior Vena Cava, Pulmonary Trunk & Aortic Arch Superior Vena Cava Right Lung Left Lung Aortic Arch Pulmonary Trunk

14 What now? Locate all Respiratory & Digestive System organs listed on Page 13 of your lab packet! Use pg. 404 & pg. 409 in your lab books for help Note: do NOT find the urinary organs yet – we will do this later. When your group thinks it has found everything – call me over so I can review it with you!

15 Ready to clean up? Cut off strings – throw away in GREEN trash. Throw any PIG TISSUE WASTE in the RED trash Rinse pig under water and clean both external and internal areas. Spray pig with cavicide (in white spray bottle) inside and out! Put pig in your saved plastic bag and secure with rubber band. Write the pig’s name (or group name) on the bag in permanent marker. –Place bagged pig in the tray. Spray down your table with cavicide or simple green!

16 Respiratory System Make sure you can locate: –External nares –Larynx –Trachea –Diaphragm –lungs

17 Digestive System Be sure you can locate: –Tongue –Esophagus –Stomach –Liver –Gallbladder –Small intestine –Large Intestine –Pancreas –Mesentery –Rectum

18 Digestive System Liver Gallbladder Small intestine Large intestine Mesentery Rectum Note: the following are not shown, but you need to know where they are: Tongue, esophagus, stomach, pancreas

19 Fetal Pig Dissection – Day 2

20 Urinary System Do NOT cut out the intestines to dissect the urinary system! Push the intestines to one side and use a scalpel or blunt probe to remove the connective tissue around each kidney and ureter Note the ALLANTOIC BLADDER Right Kidney Left Kidney Right Ureter Left Ureter Allantoic Bladder Rectum

21 Reproductive System - MALE Allantoic Bladder testes Penis Spermatic Cord Epididymis Spermatic Cord testes

22 Reproductive System - FEMALE Allantoic Bladder Ovary Uterine Horn Uterine Body

23 Cardiovascular System – Heart & Spleen heart Spleen

24 Cardiovascular System – page 418 –1 PINK common carotid artery on each side –2 BLUE jugular veins on each side These are the internal and external jugular veins Internal Jugular Vein Common Carotid Artery External Jugular Vein

25 Cardiovascular System: Superior Vena Cava, Pulmonary Trunk & Aortic Arch Superior Vena Cava Right Lung Left Lung Aortic Arch Pulmonary Trunk

26 Cardiovascular System: Inferior Vena Cava & Abdominal Aorta Inferior Vena Cava Small Intestine Mesentery Abdominal Aorta Rectum

27 Ready to clean up? Cut off strings – throw away in GREEN trash. Throw any PIG TISSUE WASTE in the RED trash Rinse pig under water and clean both external and internal areas. Spray pig with cavicide (in white spray bottle) inside and out! Put pig in your saved plastic bag and secure with rubber band. Write the pig’s name (or group name) on the bag in permanent marker. –Place bagged pig in the tray. Spray down your table with cavicide or simple green!


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