Dissection Instructions

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

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

2. Use scissors to lift the abdominal muscles amethod from the body cavity.Cut along the midline of the body to the forelimbs.3.Make transverse (horizontal) cuts close to the arms and legs.4.Life the flaps of the body wall and also pin earlier.

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

Locateeach of the organs below. Check package to indicate that youuncovered the organs.


1. FatBodies --Spaghetti shaped structures that have actually a bappropriate oselection oryellow shade, if you have actually a specifically fat frog, these fat bodies mayshould be removed to check out the other frameworks. Generally they are locatedsimply on the inside of the abdominal wall.

2. Peritoneum ­ A spider-web like membrane that covers many type of of the organs, most easily watched covering the heart.

3. Liver--Thelargest structure of the the body cavity. This brvery own colored body organ iswritten of 3 lobes. The right lobe, the leftanterior lobe, and the left posterior lobe. The live secretes a digestive juice calledbile which is required for the proper digestion of fats.

4. Heart - at the peak of the liver, the heart is a triangular structure. The leftand also appropriate atrium can be discovered at the optimal of the heart. A single ventricle located at the bottom of the heart. The huge vessel extfinishing out fromthe heart is the conus arteriosis.

5. Lungs - Locate the 2 spongy lungs by looking behind the heart and also liver..

6. Gall Bladder --Lift the lobes of the liver,tbelow will certainly be a little green sac under the liver. This is the gall bladder,which stores bile. (hint: it kind of looks favor a booger)

7. Stomach--Curving from underneath the liveris the stomach. The stomach is the first significant site of chemical digestion.Frogs swallow their meals entirety. Follow the stomach to wbelow it turnsright into the little intestine. The pyloric sphincter valve regulatesthe leave of digested food from the stomach to the small intestine.

8. Pancreas - This framework is located on the inside curve of the stomach. It it a gland also that frequently drops acomponent throughout the preserving procedure so it many not be visible on your frog.

9. SmallIntestine--Leading from the stomach. The first straight portionof the tiny intestine is dubbed the duodenum, the curled portionis the ileum. The ileum is held together by a membrane calledthe mesentery. Keep in mind the blood vessels running via the mesentery,they will lug absorbed nutrients ameans from the intestine. Absorptionof digested nutrients occurs in the little intestine.

10. LargeIntestine--As you follow the tiny intestine dvery own, it willwiden right into the large intestine. The large intestine leads to the cloaca, which is the last stop prior to solid wastes,sperm, eggs, and also urine exit the frog"s body. (Words "cloaca" meansdrain.) The opening to the external of the doy is the anus.

11. Spleen--Rerotate to the folds of the mesentery, this dark redspherical object serves as a holding location for blood.

12. Esophagus--Rerevolve to the stomach and also followit upward, wright here it gets smaller sized is the start of the esophagus.The esophagus is the tube that leads from the frogs mouth to the stomach.Open the frogs mouth and also discover the esophagus, poke your probe right into itand check out wright here it leads.


Removal of theStomach: Cut the stomach out of the frog and open it up. You may find whatremains of the frog"s last meal in there. Look at the texture of the stomachon the inside.

Whatdid you uncover in the stomach?

Measuring the Smallintestine: Rerelocate the tiny intestine from the body cavity and also carefullysepaprice the mesentery from it. Stretch the small intestine out andmeacertain it. Now measure your frog. Record the measurements 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 should recognize the structures for both the male and female frog

Kidneys - flattened bean shaped organs located atthe lower earlier of the frog, close to the spine. They are often a dark shade. Thekidneys filter wastes from the blood. Often the peak of the kidneys have actually yellowish stringy fat bodies attached.

See more: Which Of The Following Would Be Deducted From The Balance Per Bank On A Bank Reconciliation?

Testes - in male frogs, these organs are located atthe top of the kidneys, they are pale colored and also roundish. Oviducts - females do not have actually testes, though youmay see a curly structure approximately the outside of the kidney, these arethe oviducts. Oviducts are wbelow eggs are produced. Males deserve to haveframeworks that look similar, but serve no actual purpose. In males, theyare referred to as vestigial oviducts.

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

Cloaca - mentioned aget as part of the urogenitalmechanism - urine, sperm and eggs departure right here.

Label the components of the urogenital device.

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Article Lab Questions

1. The membrane holds the coils of the tiny intestine together: _________________________2.This organ is discovered under the liver, it stores bile: ___________________________3. Name the 3 lobes of the liver: _____________________, ____________________, ____________________4. The body organ that is the first significant 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 serve as an power reserve: _________________________9. The initially part of the small intestine(right part): ____________________________10. After food passes via the stomach it enters the: _________________________11. A spiderweb prefer membrane that covers the organs: ___________________________12. Regulates the exit of partly digested food from the stomach: _____________________13. The digestive system ends at the opening called the:________________________14. Organ uncovered within the mesentery that stores blood: __________________________15. The largest organ in the body cavity: __________________________

Label the Diagram

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

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This job-related is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Credits: Title Frog at Top - http://www.clker.com/clipart-coolred-eyed-frog.htmlFrog Urogenital Solution were modifed from http://biodidac.bio.uottawa.ca/ Frog Labeling modifed from an unrecognized scource, letters were added as were absent organs

This is component of a dissection series that includes: Frog External Anatomy | Frog Disarea | Frog Brain and LegPictures of Dissected from through labels are easily accessible at Frog Dissection Gallery