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 to lift the abdominal muscle muscles far from the human body cavity.Cut along the midline the the body to the forelimbs.3.Make transverse (horizontal) cuts close to the arms and also legs.4.Life the flaps that the body wall surface and pin back.

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

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


1. FatBodies --Spaghetti shaped structures that have a bright orange oryellow color, if you have a specifically fat frog, this fat body mayneed come be gotten rid of to check out the various other structures. Generally they room locatedjust top top the within of the abdominal wall.

2. Peritoneum ­ A spider-web favor membrane that covers plenty of of the organs, most easily seen covering the heart.

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

4. Heart - at the height of the liver, the love is a triangle structure. The leftand right atrium deserve to be uncovered at the peak of the heart. A single ventricle situated at the bottom of the heart. The big vessel prolonging out fromthe love is the conus arteriosis.

5. Lungs - find the two spongy lung by spring 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 bitterly bladder,which shop bile. (hint: it sort of looks favor a booger)

7. Stomach--Curving from underneath the liveris the stomach. The stomach is the first major website of chemical digestion.Frogs swallow your meals whole. Follow the stomach to wherein it turnsinto the tiny intestine. The pyloric sphincter valve regulatesthe departure of spend food from the stomach come the tiny intestine.

8. Pancreas - This framework is located on the inside curve that the stomach. That it a gland that often falls apart throughout the preserving process so it many not be visible on her frog.

9. SmallIntestine--Leading from the stomach. The first straight portionof the small intestine is called the duodenum, the cutting portionis the ileum. The ileum is hosted together by a membrane calledthe mesentery. Keep in mind the blood ship running with the mesentery,they will certainly carry took in nutrients away from the intestine. Absorptionof digested nutrients occurs in the little intestine.

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

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

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


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

Whatdid you uncover in the stomach?

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

Urogenital system

The frog"s reproductiveand excretory system is linked into one system referred to as the urogenital system.You will require to understand the frameworks for both the male and female frog

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

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

Bladder - An empty sac situated at the shortest partof the body cavity. The bladder shop urine.

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

Label the parts of the urogenital system.

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Post laboratory Questions

1. The membrane stop the coils the the little intestine together: _________________________2.This body organ is discovered under the liver, it stores bile: ___________________________3. Surname the 3 lobes that the liver: _____________________, ____________________, ____________________4. The organ that is the first major site of chemistry digestion: _______________________5. Eggs, sperm, urine and wastes all empty into this structure: __________________________6. The small intestine leader to the: _______________________________7. The esophagus leader to the: ______________________________8. Yellowish frameworks that offer as an energy reserve: _________________________9. The very first part that the little intestine(straight part): ____________________________10. ~ food passes through the stomach that enters the: _________________________11. A spiderweb favor membrane the covers the organs: ___________________________12. Regulates the exit of partly digested food native the stomach: _____________________13. The digestive system ends at the opening dubbed the:________________________14. Organ found 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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This job-related is license is granted under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 global License.

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

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