Presentation on theme: "Fetal Pig Dissection! Work in Groups of 3-4"— 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 group1 large dissection pan2 pieces of string - ~25-30 inches long2 good scalpelsScissors2 BLUNT ProbesForceps (tweezers)
3 Initial Prep Open up the plastic bag – Cut open the bag over the sink. Empty pig and contents into sink. THROW AWAY bag into the GREEN trashRinse off pig well. Towel dry and place in a dissection tray
4 External Observations Look for the umbilical cordTry to find the umbilical arteries/veins that connected its blood supply to mom via the placentaExternal nares (remember what those are?)TongueExternal naresTongue
5 External Observations ScrotumBoy 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!BOY!AnusGenital PapillaAnusGIRL!!!
6 Securing your Pig to the tray Use the 2 pieces of string to secure your pig to the dissecting tray
7 Incision Time1. Take a scalpel – make a SUPERFICIAL midsaggital incision from chin to umbilical cord2. 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 pigAlso be careful not to demolish the DIAPHRAGM at the base of the rib cage!
8 Incision Time3. & 4. Use scissors to make 2 lateral cuts. Avoid the staples on one side of the pigAlso be careful not to demolish the DIAPHRAGM at the base of the rib cage!Diaphragm
9 DiaphragmUse 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 page 409 of lab book)DiaphragmDiaphragm
10 Separate Skin from rib cage & neck Using your scapel – separate the skin of the chest area off of the rib cage AND neck region.You will have to cut through muscle and connective tissue to do thisIt’s like skinning raw chicken!
11 Cutting off the Rib Cage Using scissors – cut of each half of the rib cage. You should end up with 2 large chunks of ribs in your tray
12 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 disposalUsing a SHARP scalpel – remove all muscle and tissue overlying the larynx and tracheaLarynxTracheaBe careful NOT to cut through these blood vessels
13 Neck Blood Vessels – pg. 418Using a BLUNT PROBE – carefully probe on either side of the trachea until you expose1 PINK common carotid artery on each side2 BLUE jugular veins on each sideThese are the internal and external jugular veinsCommon Carotid ArteryInternal Jugular VeinExternal Jugular Vein
14 Heart Using a combination of scalpel and scissors: Cut off the pericardial sac that surrounds the heartBe careful not to cut off any important blood vessels!Also not the texture and position of the RIGHT AND LEFT LUNGS.Superior Vena CavaRight LungLeft Lung
15 Cardiovascular System: Superior Vena Cava, Pulmonary Trunk & Aortic Arch Right LungLeft Lung
16 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 helpNote: 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!
17 Digestive SystemNote: the following are not shown, but you need to know where they are:Tongue, esophagus, stomach, pancreasLiverLarge intestineGallbladderMesenterySmall intestineRectum
18 Ready to clean up? Cut off strings – throw away in GREEN trash. Throw any PIG TISSUE WASTE in the RED trashRinse pig under water and clean both external and internal areas.Spray pig with cavicide (in white spray bottle) inside and out!Put pig in a 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!
19 Respiratory System Make sure you can locate: External nares Larynx TracheaDiaphragmlungs
20 Digestive System Be sure you can locate: Tongue Esophagus Stomach LiverGallbladderSmall intestineLarge IntestinePancreasMesenteryRectum
21 Fetal Pig Dissection – Day 2 Grab your pig from the tray – save the bag!Rinse him/her off again!Cut 2 pieces of string and secure your pig to the trayGet: Scapel, Scissors, Forceps (tweezers), blunt probe
22 Urinary SystemDo 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 ureterNote the ALLANTOIC or URINARY BLADDERRectumLeft KidneyRight KidneyLeft UreterRight UreterAllantoic or Urinary Bladder
23 Cardiovascular System – page 418 1 PINK common carotid artery on each side2 BLUE jugular veins on each sideThese are the internal and external jugular veinsCommon Carotid ArteryInternal Jugular VeinExternal Jugular Vein
24 Cardiovascular System: Superior Vena Cava, Pulmonary Trunk & Aortic Arch Right LungLeft Lung
27 Reproductive System - MALE Allantoic or Urinary BladderSpermatic CordPenistestesSpermatic CordEpididymisEpididymistestes
28 Reproductive System - FEMALE Uterine HornUterine HornOvaryOvaryUterine BodyAllantoic Bladder
29 Ready to clean up? Cut off strings – throw away in GREEN trash. Throw any PIG TISSUE WASTE in the RED trashRinse 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!