Frog dissection powerpoint skin#

Ībout the Author I am currently attending Grand Valley State University to receive a Secondary Education certification with a major in Biology and minor in Earth Science. Examine the cranium and brain, describe what you see. What is the small green sac that attaches to the liver? 10. Follow the digestive tract of the frog and briefly explain who food goes from the mouth and out of the anus. What is the livers function in the body? 7.

Is your frog male or female? How did you know it was male/female? Click next to continue to page 2 of the worksheetĬopy of Worksheet…2 6. When looking at the tongue, where is it attached (the back or front of the mouth)? 5.

Look at the front limbs…there are _toes on each foot. Look at the hind limbs…there are _ toes on each foot. Write down your observations of the skins texture and color. Ĭopy of the Worksheet worksheet will be given out in class 1. Dispose of the frog and materials as directed in class. Then cut open the cranium and expose the brain.

Frog dissection powerpoint skin#

You are going to cut the skin on the neck and head to expose the cranium. Procedure…3 Internal Anatomy After removing the necessary organs, unpin the frog and turn it dorsal side up. the ovaries (female) or testes (male) Go to the next slide for further procedures… Find and remove : the stomach, intestines, pancreas (yellowish color), and gall bladder (greenish color). 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). Carefully find the liver (large brown organ with 3 lobes) and remove it. Procedure…2 Internal Anatomy Answer the appropriate questions on the worksheet as you go along. 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). Make a cut down through the middle of the frog and then two perpendicular cuts (watch the video showing the process). Pin the forelimbs and hindlimbs to the tray. (Follow the External Anatomy and Inside the Mouth slides) After answering the questions on the exterior, placing the frog on the tray ventral side up. Procedure Examine the exterior of the frog. Rub your finger along the inside of the jaw, you will feel the maxillary teeth. What unusual features do you notice? Find the two knobs that come out of the roof of the mouth. Inside the Mouth Identify: Two large Muscular Pads are in the roof of the mouth (eyes retract here when it blinks) Locate Tongue. How many Digits are there to each hindlimb?

Examine the muscular hindlimbs Locate the thigh, knee, and ankle joints Examine the webs of the foot. How many Digits (fingers) are there to a Forelimb? At the posterior end of your frog is the Cloaca (feces, urine, and reproductive cells are expelled here). Locate the shoulder, elbow, and wrist joints of the Forelimbs. Locate the Tympanic membrane (ear drum) just posterior to the eye. Materials A dissecting tray Pins A frog Scalpel Scissors Forceps Įxternal Anatomy Identify: Take notice of the skin The external Nares (nostrils) The eyes and the third eye-lid (which covers the eye when underwater. Terminology Dorsal-on or near the back Ventral-on or near the front (opposite of dorsal) Posterior-on or near the behind Anterior-on or near the top īackground 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 Main Menu Terminology Background Information Materials External Anatomy Inside the Mouth Procedure Copy of Worksheet Concept Map Author’s information Resources Frog Dissection By, Sammi Krystiniak Ed 205 section 09