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Frog dissection worksheet with answers5/17/2023 ![]() ![]() The teeth you feel are the MAXILLARY TEETH. Feel the inside of the upper jaw ( maxilla) and the lower jaw (mandible). Is it attached to the front or the back of the mouth? _Front_In a live frog, the tongue is sticky and is used to catch insects. Place the frog on its dorsal side in the dissecting pan and cut the corners of the mouth. Why does each sides color help protect the frog from predators? Coloration acts as camouflage Figure 1. Turn the frog onto its ventral side and notice the color difference. The frog can breathe directly through its skin as well as with its lungs. Label the mouth, tympanum, and the external nares on Figure 1. The nasal openings, are also call EXTERNAL NARES, found toward the tip of the snout will closes when the frog is under water. They locate the two openings into the nasal cavity. Behind each eye find the circular eardrum called a TYMPANUM. Label the eye and the nictitating membrane on Figure 1. ![]() It is a transparent membrane the protects the eye while permitting the frog to see under water. The 2 outer ones are the color of the fog's body. Label the hind and front legs on Figure 1. Notice the difference between the toes of the hind legs and those of the front legs. The forelegs provide balance and cushion the frog when it lands after jumping. The hind legs are strong and muscular and are used for jumping and swimming. Examine the hind legs and front legs of the frog. Place the frog on its belly (ventral side) in the dissecting pan 2. PROCEDURE AND OBSERVATIONS: EXTERNAL ANATOMY 1. Observe several frogs to see the difference between males and females. Male frogs are also usually smaller than female frogs. A male frog usually has thick pads on its "thumbs," which is one external difference between the sexes, as shown in the diagram below. To determine the frog’s sex, look at the hand digits, or fingers, on its forelegs. ![]() Purpose: In this lab, you will dissect an frog in order to observe the external and internal structures of the frog anatomy SEXING YOUR FROG: Place a frog on a dissection tray. FROG DISSECTION GROUP NAMES: _ Materials: Dissecting pins, forceps, scissors, paper towel, dissecting probe, preserved frog, dissection tray. ![]()
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