Dissection Instructions

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

You are watching: Eggs sperm urine waste empty into

2. Usage scissors come lift the ab muscles away from the body cavity.Cut along the midline the the body to the forelimbs.3.Make transverse (horizontal) cuts close to the arms and legs.4.Life the flaps the the body wall surface and pin back.

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

Locateeach the the guts below. Examine the box to suggest that youfound the organs.


1. FatBodies --Spaghetti shaped frameworks that have actually a glowing orange oryellow color, if you have actually a particularly fat frog, these fat body mayneed to be gotten rid of to watch the other structures. Typically they are locatedjust ~ above the inside of the abdominal muscle wall.

2. Peritoneum ­ A spider-web like membrane the covers plenty of of the organs, most easily seen spanning the heart.

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

4. Heart - in ~ the top of the liver, the heart is a triangular structure. The leftand best atrium have the right to be discovered at the optimal of the heart. A single ventricle located at the bottom that the heart. The huge vessel expanding out fromthe heart is the conus arteriosis.

5. Lungs - locate the 2 spongy lungs by feather behind the heart and also liver..

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

7. Stomach--Curving from underneath the liveris the stomach. The stomach is the an initial major website of chemistry digestion.Frogs swallow your meals whole. Follow the stomach to wherein it turnsinto the little intestine. The pyloric sphincter valve regulatesthe leave of digested food from the stomach come the little intestine.

8. Pancreas - This structure is located on the within curve that the stomach. That it a gland the often drops apart during the preserving process so it countless not be clearly shows on her frog.

9. SmallIntestine--Leading indigenous the stomach. The very first straight portionof the tiny intestine is referred to as the duodenum, the cut portionis the ileum. The ileum is held together through a membrane calledthe mesentery. Keep in mind the blood vessels running through the mesentery,they will carry absorbed nutrients far from the intestine. Absorptionof digested nutrient occurs in the tiny intestine.

10. LargeIntestine--As you follow the small intestine down, the willwiden right into the big intestine. The big intestine leader to the cloaca, i beg your pardon is the last stop prior to solid wastes,sperm, eggs, and urine leave the frog"s body. (The word "cloaca" meanssewer.) The opening to the outside of the doy is the anus.

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

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


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

Whatdid you discover in the stomach?

Measuring the Smallintestine: remove the little intestine native the body cavity and also carefullyseparate the mesentery indigenous it. Stretch the little intestine out andmeasure it. Now measure your frog. Record the measurements listed below in centimeters. Frog length:_______ centimeter Intestine size ________ cm

Urogenital system

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

Kidneys - flattened bean shaped organs situated atthe lower back of the frog, close to the spine. Castle are frequently a dark color. Thekidneys filter wastes indigenous the blood. Often the peak of the kidneys have yellowish stringy fat bodies attached.

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Testes - in masculine frogs, these organs are located atthe height of the kidneys, they are pale colored and also roundish. Oviducts - females perform not have testes, despite youmay watch a curly structure around the outside of the kidney, these arethe oviducts. Oviducts space where eggs space produced. Males deserve to havestructures that look similar, however serve no really purpose. In males, theyare called vestigial oviducts.

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

Cloaca - stated again as part of the urogenitalsystem - urine, sperm and eggs exit here.

Label the components of the urogenital system.

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Post rap Questions

1. The membrane hold the coils of the tiny intestine together: _________________________2.This body organ is discovered under the liver, it stores bile: ___________________________3. Name the 3 lobes that the liver: _____________________, ____________________, ____________________4. The organ that is the an initial major site of chemical digestion: _______________________5. Eggs, sperm, urine and also wastes every empty into this structure: __________________________6. The little intestine leads to the: _______________________________7. The esophagus leads to the: ______________________________8. Yellowish structures that serve as an energy reserve: _________________________9. The very first part the the small intestine(straight part): ____________________________10. After ~ food passes through the stomach it enters the: _________________________11. A spiderweb prefer membrane that covers the organs: ___________________________12. Regulates the exit of partly digested food indigenous the stomach: _____________________13. The digestive mechanism ends at the opening called the:________________________14. Organ found within the mesentery that stores blood: __________________________15. The biggest 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 license is granted under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 international License.

Credits: title Frog at peak - http://www.clker.com/clipart-coolred-eyed-frog.htmlFrog Urogenital solution were modifed native http://biodidac.bio.uottawa.ca/ Frog Labeling modifed from an unknown scource, letters were included as were missing organs

This is component of a dissection collection that includes: Frog exterior Anatomy | Frog Dissection | Frog mind and LegPictures that Dissected from through labels are easily accessible at Frog Dissection Gallery