Frog Dissection


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A lesson for middle/high school students on how to dissect a frog.

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Frog Dissection

  1. 1. Frog Dissection By, Sammi Krystiniak Ed 205 section 09
  2. 2. Main Menu <ul><li>Terminology </li></ul><ul><li>Background Information </li></ul><ul><li>Materials </li></ul><ul><li>External Anatomy </li></ul><ul><li>Inside the Mouth </li></ul><ul><li>Procedure </li></ul><ul><li>Copy of Worksheet </li></ul><ul><li>Concept Map </li></ul><ul><li>Author’s information </li></ul><ul><li>Resources </li></ul>
  3. 3. Terminology <ul><li>Dorsal-on or near the back </li></ul><ul><li>Ventral-on or near the front (opposite of dorsal) </li></ul><ul><li>Posterior-on or near the behind </li></ul><ul><li>Anterior-on or near the top </li></ul>
  4. 4. Background Information Click on this video to learn about the environmental threats on frogs Click on this video to learn about frogs skin and its qualities
  5. 5. Materials <ul><ul><ul><li>A dissecting tray </li></ul></ul></ul><ul><ul><ul><li>Pins </li></ul></ul></ul><ul><li> A frog </li></ul><ul><li>Scalpel </li></ul><ul><li>Scissors </li></ul><ul><li>Forceps </li></ul>
  6. 6. External Anatomy <ul><li>Identify: </li></ul><ul><li>Take notice of the skin </li></ul><ul><li>The external Nares (nostrils) </li></ul><ul><li>The eyes and the third eye-lid (which covers the eye when underwater. </li></ul><ul><li>Locate the Tympanic membrane (ear drum) just posterior to the eye. </li></ul><ul><li>Locate the shoulder, elbow, and wrist joints of the Forelimbs. </li></ul><ul><li>How many Digits (fingers) are there to a Forelimb? </li></ul><ul><li>At the posterior end of your frog is the Cloaca (feces, urine, and reproductive cells are expelled here). </li></ul><ul><li>Examine the muscular hindlimbs </li></ul><ul><li>Locate the thigh, knee, and ankle joints </li></ul><ul><li>Examine the webs of the foot. </li></ul><ul><li>How many Digits are there to each hindlimb? </li></ul>
  7. 7. Inside the Mouth <ul><li>Identify: </li></ul><ul><li>Two large Muscular Pads are in the roof of the mouth (eyes retract here when it blinks) </li></ul><ul><li>Locate Tongue. </li></ul><ul><li>What unusual features do you notice? </li></ul><ul><li>Find the two knobs that come out of the roof of the mouth. These are called Vomerine teeth. </li></ul><ul><li>Rub your finger along the inside of the jaw, you will feel the maxillary teeth. </li></ul>
  8. 8. Procedure <ul><li>Examine the exterior of the frog. (Follow the External Anatomy and Inside the Mouth slides) </li></ul><ul><li>After answering the questions on the exterior, placing the frog on the tray ventral side up. </li></ul><ul><li>Pin the forelimbs and hindlimbs to the tray. </li></ul><ul><li>Make a cut down through the middle of the frog and then two perpendicular cuts (watch the video showing the process). </li></ul>Click here to watch video Go to next slide for further procedures… After you make your cut, pin the skin back to the tray, now repeat the process and cut through the muscle layer this time (exposing the internal organs).
  9. 9. Procedure…2 Internal Anatomy <ul><li>Answer the appropriate questions on the worksheet as you go along. </li></ul><ul><li>Carefully find the liver (large brown organ with 3 lobes) and remove it. </li></ul><ul><li>Your frog may have fat bodies and if you have a female it may contain a mass of eggs (you may need to remove these in order to examine the organs). </li></ul><ul><li>Find and remove : </li></ul><ul><ul><li>the stomach, intestines, pancreas (yellowish color), and gall bladder (greenish color). </li></ul></ul><ul><ul><li>the heart, left lung, and right lung. </li></ul></ul><ul><ul><li>the spleen and kidneys. </li></ul></ul><ul><ul><li>the ovaries (female) or testes (male) </li></ul></ul>Go to the next slide for further procedures…
  10. 10. Procedure…3 Internal Anatomy <ul><li>After removing the necessary organs, unpin the frog and turn it dorsal side up. You are going to cut the skin on the neck and head to expose the cranium. </li></ul><ul><li>Then cut open the cranium and expose the brain. </li></ul><ul><li>Dispose of the frog and materials as directed in class. Clean all tools appropriately. </li></ul>
  11. 11. Copy of the Worksheet worksheet will be given out in class <ul><li>1. Write down your observations of the skins texture and color. </li></ul><ul><li>2. Look at the hind limbs…there are __ toes on each foot. </li></ul><ul><li>3. Look at the front limbs…there are __toes on each foot. </li></ul><ul><li>4. When looking at the tongue, where is it attached (the back or front of the mouth)? </li></ul><ul><li>5. Is your frog male or female? How did you know it was male/female? </li></ul>Click next to continue to page 2 of the worksheet
  12. 12. Copy of Worksheet…2 <ul><li>6. What is the livers function in the body? </li></ul><ul><li>7. Follow the digestive tract of the frog and briefly explain who food goes from the mouth and out of the anus. </li></ul><ul><li>8. There are __ chambers in the heart. </li></ul><ul><li>9. What is the small green sac that attaches to the liver? </li></ul><ul><li>10. Examine the cranium and brain, describe what you see. </li></ul>
  13. 13. Concept Map
  14. 14. About the Author <ul><li>I am currently attending Grand Valley State University to receive a Secondary Education certification with a major in Biology and minor in Earth Science. </li></ul><ul><li>I love to be outdoors, I love to swim and go hiking and camping. </li></ul><ul><li>If you need to contact me my email is: [email_address] </li></ul>
  15. 15. Resources <ul><li>Video of Frog Dissection </li></ul><ul><li>http:// = vK-YTwHZTSY </li></ul><ul><li>Red Eyed Tree Frog Pictures </li></ul><ul><li> </li></ul><ul><li>Video of Frog Skin and Video of Environmental Threats </li></ul><ul><li>http:// </li></ul>