Life Science - Unit 9 - Frog Dissection External and Internal

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Name: _______________________________________Date:____ Frog Dissection: Complete Guide External Anatomy 1. Observe the dorsal and ventral sides of the frog. Dorsal side color ___________ Ventral side color ____________ 2. Examine the hind legs. How many toes are present on each foot? ______ Are they webbed? _____ 3. Examine the forelegs. How many toes are present? ________ Are the toes webbed? _______ 4. Use a ruler to measure your from the tip of the head to the end of the frog's backbone. Compare the length of your frog to other frogs. Your Frog (cm) Frog 2 Frog 3 Frog 4 Frog 5 Average Length 5. Locate the frog's eyes, the nictitating membrane is a clear membrane that attached to the bottom of the eye. Use tweezers to carefully remove the nictitating membrane. You may also remove the eyeball. What color is the nictitating membrane? _____________ What color is the eyeball? _________________ 6. Just behind the eyes on the frog's head is a circular structure called the tympanic membrane. The tympanic membrane is used for hearing. Measure the diameter (distance across the circle) of the tympanic membrane. Diameter of tympanic membrane = ___________cm 7. Feel the frog's skin. Is it scaley or is it slimy? ____________ Anatomy of the Frog's Mouth Procedure: Pry the frog's mouth open and use scissors to cut the angles of the frog's jaws open. Cut deeply so that the frog's mouth opens wide enough to view the structures inside. 1. Locate the tongue. Play with the tongue. Does it attach to the front or the back of the mouth? __________ (You may remove the tongue). Draw a sketch of the tongue, paying attention to its shape. Tongue Sketch: 2. In the center of the mouth, toward the back is a single round opening, the esophagus. This tube leads to the stomach. Use a probe to poke into the esophagus. 3. Close to the angles of the jaw are two openings, one on each side. These are the Eustachian tubes. They are used to equalize pressure in the inner ear while the frog is swimming. Insert a probe into the Eustachian tube. To what structure does the Eustachian tube attach? _____________________

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