Dissection Instructions

1. Ar the frog in the dissecting pan ventral next up.

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2. Usage scissors to lift the ab muscles far from the body cavity.Cut along the midline of the body to the forelimbs.3.Make transverse (horizontal) cuts near the arms and legs.4.Life the flaps the the body wall and pen back.

*Ifyour specimen is a female, the body might be filled through eggs. You might need to remove these eggs to see the organs.

Locateeach the the organs below. Examine the crate to show that youfound the organs.

1. FatBodies --Spaghetti shaped frameworks that have a glowing orange oryellow color, if you have actually a an especially fat frog, these fat bodies mayneed come be gotten rid of to see the other structures. Usually they room locatedjust on the within of the ab wall.

2. Peritoneum ­ A spider-web prefer membrane that covers plenty of of the organs, most conveniently seen extending the heart.

3. Liver--Thelargest structure of the the human body cavity. This brown colored body organ iscomposed of 3 lobes. The right lobe, the leftanterior lobe, and also the left posterior lobe. The live secretes a cradle juice calledbile i beg your pardon is needed for the suitable digestion that fats.

4. Heart - at the height of the liver, the love is a triangle structure. The leftand right atrium can be found at the optimal of the heart. A single ventricle located at the bottom of the heart. The huge vessel prolonging out fromthe heart is the conus arteriosis.

5. Lungs - situate the 2 spongy lung by feather behind the heart and liver..

6. Bile Bladder --Lift the lobes the the liver,there will be a small green sac under the liver. This is the gall bladder,which shop bile. (hint: it kind of looks favor a booger)

7. Stomach--Curving from under the liveris the stomach. The stomach is the an initial major site of chemical digestion.Frogs swallow their meals whole. Monitor the stomach to where it turnsinto the tiny intestine. The pyloric sphincter valve regulatesthe exit of spend food indigenous the stomach to the small intestine.

8. Pancreas - This structure is located on the inside curve of the stomach. That it a gland that often drops apart during the preserving procedure so it many not be clearly shows on your frog.

9. SmallIntestine--Leading native the stomach. The first straight portionof the tiny intestine is dubbed the duodenum, the curled portionis the ileum. The ileum is organized together through a membrane calledthe mesentery. Note the blood ship running through the mesentery,they will carry took in nutrients away from the intestine. Absorptionof digested nutrients occurs in the little intestine.

10. LargeIntestine--As you follow the little intestine down, it willwiden right into the large intestine. The huge intestine leader to the cloaca, i m sorry is the last stop before solid wastes,sperm, eggs, and also urine departure the frog"s body. (The indigenous "cloaca" meanssewer.) The opening to the outside of the doy is the anus.

11. Spleen--Return to the crease of the mesentery, this dark redspherical thing serves together a hold area because that blood.

12. Esophagus--Return come the stomach and followit upward, whereby it gets smaller is the beginning of the esophagus.The esophagus is the tube the leads native the frogs mouth to the stomach.Open the frogs mouth and also find the esophagus, poke your probe right into itand check out where that leads.

Removal that theStomach: cut the stomach out of the frog and open that up. Girlfriend may discover whatremains the the frog"s last enjoy the meal in there. Look in ~ the texture of the stomachon the inside.

Whatdid you uncover in the stomach?

Measuring the Smallintestine: remove the small intestine from the body cavity and also carefullyseparate the mesentery from it. Large the tiny intestine the end andmeasure it. Currently measure your frog. Record the measurements below in centimeters. Frog length:_______ cm Intestine length ________ cm

Urogenital system

The frog"s reproductiveand excretory mechanism is combined into one system dubbed the urogenital system.You will need to understand the structures for both the male and also female frog

Kidneys - flattened bean shaped organs located atthe lower back of the frog, near the spine. They are frequently a dark color. Thekidneys filter wastes indigenous the blood. Regularly the peak of the kidneys have yellowish stringy fat bodies attached.

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Testes - in masculine frogs, this organs are located atthe height of the kidneys, they space pale colored and also roundish. Oviducts - females do not have actually testes, though youmay check out a curly structure around the exterior of the kidney, this arethe oviducts. Oviducts room where eggs room produced. Males deserve to havestructures the look similar, yet serve no really purpose. In males, theyare dubbed vestigial oviducts.

Bladder - An empty sac located at the lowest partof the body cavity. The bladder stores urine.

Cloaca - stated again as component of the urogenitalsystem - urine, sperm and eggs leave here.

Label the parts of the urogenital system.


Post rap Questions

1. The membrane stop the coils of the little intestine together: _________________________2.This body organ is uncovered under the liver, it shop bile: ___________________________3. Name the 3 lobes that the liver: _____________________, ____________________, ____________________4. The organ that is the very first major site of chemical digestion: _______________________5. Eggs, sperm, urine and also wastes all empty into this structure: __________________________6. The little intestine leads to the: _______________________________7. The esophagus leads to the: ______________________________8. Yellowish frameworks that offer as an energy reserve: _________________________9. The an initial part the the little intestine(straight part): ____________________________10. After food passes v the stomach that enters the: _________________________11. A spiderweb like membrane the covers the organs: ___________________________12. Regulates the departure of partly digested food native the stomach: _____________________13. The digestive device ends at the opening dubbed the:________________________14. Organ uncovered within the mesentery that stores blood: __________________________15. The biggest organ in the human body cavity: __________________________

Label the Diagram

A. __________________________________B. __________________________________C. __________________________________D. __________________________________E. __________________________________F. __________________________________G. __________________________________H. __________________________________I. __________________________________J. __________________________________K. __________________________________L. __________________________________M. __________________________________N. __________________________________P. __________________________________


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Credits: title Frog at top - http://www.clker.com/clipart-coolred-eyed-frog.htmlFrog Urogenital solution were modifed indigenous http://biodidac.bio.uottawa.ca/ Frog Labeling modifed from an unknown scource, letter were added as were absent organs

This is part of a dissection collection that includes: Frog external Anatomy | Frog Dissection | Frog brain and LegPictures of Dissected from v labels are easily accessible at Frog Dissection Gallery