You may need to remove these eggs to view the organs. *If your specimen is a female, the body may be filled with eggs and an enlarged ovary. Lift the flaps of the body wall and pin back. Make transverse (horizontal) cuts near the arms and legs. Cut along the midline of the body from the pelvic to the pectoral girdle. Use scissors to lift the abdominal muscles away from the body cavity to avoid damaging any organs below the muscle as you cut.
#FROG DISSECTION MANUAL SKIN#
You will notice the skin has already been pre-cut. Pin each foreleg and hind leg to the pan. Place the frog in the dissecting pan ventral side up. Complete the chart below Structure Vomerine teeth Eustachian tubes Nictitating Membrane Tympanic Membrane Esophagus Glottis Tongue Internal Anatomy Dissection Instructions Function Location 1. On the diagram below, label each of the structures underlined above. If you put your probe into those openings, you will find they exit on the outside of the frog. On the roof of the mouth, you will find two tiny openings. Both are used for holding prey, frogs swallow their meals whole and do NOT chew. The maxillary teeth are found around the edge of the mouth. The vomerine teeth are found on the roof of the mouth. The frog breathes and vocalizes with the glottis. This slit is the glottis, and it is the opening to the lungs. (You may need to use your probe to get it to open up). Just behind the tongue, and before you reach the esophagus, is a slit like opening. To what structure does the Eustachian tube attach? _4. They are used to equalize pressure in the inner ear while the frog is swimming. Close to the angles of the jaw are two openings, one on each side. In the center of the mouth, toward the back is a single round opening. Does it attach to the front or the back of the mouth? _ (You may remove the tongue) 2. Cut deeply enough so that the frog's mouth opens wide enough to view the structures inside. Is it scaly 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. Measure the diameter (distance across the circle) of the tympanic membrane. The tympanic membrane is used for hearing.
Just behind the eyes on the frog's head is a circular structure called the tympanic membrane. What color is the nictitating membrane? _ What color is the eyeball? _ 6. Use tweezers to carefully remove the nictitating membrane. Locate the frog's eyes, the nictitating membrane is a clear membrane that is attached to the bottom of the eye. Compare the length of your frog to other frogs Your Frog (cm) Frog 2 Frog 3 Frog 4 Frog 5 Average L e n g th 5. Use a ruler to measure your frog, measure from the tip of the head to the end of the frog's backbone (do not include the legs in your measurement). How many toes are present? _Are the toes webbed? _ Male or female? (Hint: check thumb pad) _4. How many toes are present on each foot? _ Are the toes webbed? _ 3. Dorsal side color _ Ventral side color_ 2. Observe the dorsal and ventral sides of the frog.
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