Dissection Instructions

1. Location the frog in the dissecting pan ventral side up.

You are watching: Organ found within the mesentery that stores blood

2. Use scissors come lift the abdominal muscle 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 of the body wall surface and pen back.

*Ifyour specimen is a female, the body may be filled with eggs. You might need to eliminate these eggs to watch the organs.

Locateeach of the organs below. Examine the crate to suggest that youfound the organs.


1. FatBodies --Spaghetti shaped frameworks that have actually a shining orange oryellow color, if you have a an especially fat frog, these fat body mayneed to be removed to see the various other structures. Generally they room locatedjust ~ above the inside of the ab wall.

2. Peritoneum ­ A spider-web choose membrane the covers numerous of the organs, most quickly seen extending the heart.

3. Liver--Thelargest structure of the the human body cavity. This brown colored body organ iscomposed of three lobes. The right lobe, the leftanterior lobe, and also the left posterior lobe. The live secretes a digestive juice calledbile i m sorry is needed for the appropriate digestion that fats.

4. Heart - in ~ the height of the liver, the love is a triangle structure. The leftand best atrium deserve to be discovered at the top of the heart. A solitary ventricle situated at the bottom of the heart. The big vessel extending out fromthe heart is the conus arteriosis.

5. Lungs - find the two spongy lung by feather behind the heart and liver..

6. Gall Bladder --Lift the lobes that the liver,there will be a tiny green sac under the liver. This is the bitterly bladder,which stores bile. (hint: it sort of looks favor a booger)

7. Stomach--Curving from under the liveris the stomach. The stomach is the very first major site of chemistry digestion.Frogs swallow their meals whole. Monitor the stomach to where it turnsinto the little intestine. The pyloric sphincter valve regulatesthe departure of digested food indigenous the stomach come the little intestine.

8. Pancreas - This framework is located on the inside curve of the stomach. That it a gland that often falls apart throughout the preserving process so it plenty of not be clearly shows on your frog.

9. SmallIntestine--Leading indigenous the stomach. The first straight portionof the small intestine is dubbed the duodenum, the curled portionis the ileum. The ileum is organized together by a membrane calledthe mesentery. Keep in mind the blood ship running through the mesentery,they will certainly carry soaked up nutrients far from the intestine. Absorptionof digested nutrients occurs in the little intestine.

10. LargeIntestine--As you follow the tiny intestine down, that willwiden right into the huge intestine. The huge intestine leads to the cloaca, which is the last stop before solid wastes,sperm, eggs, and urine leave the frog"s body. (The native "cloaca" meanssewer.) The opened to the outside of the doy is the anus.

11. Spleen--Return come the folds of the mesentery, this dark redspherical thing serves as a holding area for blood.

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


Removal that theStomach: reduced the stomach the end of the frog and open the up. Girlfriend may discover whatremains the the frog"s last meal in there. Look in ~ the structure of the stomachon the inside.

Whatdid you find in the stomach?

Measuring the Smallintestine: eliminate the small intestine indigenous the human body cavity and also carefullyseparate the mesentery native it. Large the tiny intestine the end andmeasure it. Currently measure her frog. Document the measurements listed below in centimeters. Frog length:_______ cm Intestine size ________ cm

Urogenital system

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

Kidneys - flattened p shaped organs situated atthe lower ago of the frog, close to the spine. Lock are regularly a dark color. Thekidneys filter wastes indigenous the blood. Regularly the height of the kidneys have actually yellowish stringy fat bodies attached.

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Testes - in male frogs, these organs are situated atthe height of the kidneys, they are pale colored and also roundish. Oviducts - females perform not have actually testes, though youmay watch a curly structure approximately the exterior of the kidney, these arethe oviducts. Oviducts are where eggs space produced. Males have the right to havestructures the look similar, but serve no actual purpose. In males, theyare referred to as vestigial oviducts.

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

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

Label the parts of the urogenital system.

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Post rap Questions

1. The membrane stop the coils of the small intestine together: _________________________2.This organ is uncovered under the liver, it stores bile: ___________________________3. Name the 3 lobes that the liver: _____________________, ____________________, ____________________4. The body organ that is the first major website of chemistry digestion: _______________________5. Eggs, sperm, urine and wastes all empty into this structure: __________________________6. The tiny intestine leader to the: _______________________________7. The esophagus leads to the: ______________________________8. Yellowish structures that serve as an power reserve: _________________________9. The an initial part of the little intestine(straight part): ____________________________10. After ~ food passes through the stomach that enters the: _________________________11. A spiderweb favor membrane the covers the organs: ___________________________12. Regulates the departure of partly digested food native the stomach: _____________________13. The digestive device ends in ~ the opening called the:________________________14. Organ uncovered within the mesentery the 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: location Frog at optimal - http://www.clker.com/clipart-coolred-eyed-frog.htmlFrog Urogenital equipment were modifed indigenous http://biodidac.bio.uottawa.ca/ Frog Labeling modifed native an unknown scource, letter were included as were lacking organs

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