Biology – Frog dissection lab Thursday May 17, 2012 Perry High School Mr. Pomerantz_______________________________________________________________________________Page 1 of 7 1 Review: Dorsal = top side (back) Anterior = toward the head (front end) Ventral = underside (belly) Posterior = toward the tail (rear end) Lateral = sides 1. Obtain a frog and rinse off. 2. Obtain dissection tools (paper for labeling, scissors, scalpel, forceps, tray, pins, probe, scissors, gloves (optional)) 3. Place your frog on a dissection tray. 4. Obtain a plastic bag and write the following information (group names, period, frog’s name) Frog External Anatomy 5. During breeding season, the base of a male frog’s thumb becomes thickened to form a little pad called a nuptial pad (see figure 1). • Do you think your frog is a male or female? ____________ 6. Observe the dorsal and ventral sides of the frog. • Dorsal side color ___________ Ventral side color ____________ • Why do you think the frog looks different on each side? Think about adaptations to its surroundings. _____________________________________ __________________________________________________________________ _________________________________________________________________. 7. Examine the hind (posterior) • How many toes are present on each foot? _______________ • Are the toes webbed? ___________ 8. Examine the forelegs (anterior) • How many toes are present? _________ • Are the toes webbed? _______ 9. Use figure 2: • Locate the frog's eyes. You will notice a clear membrane that attaches to the bottom of the eye. This is called the nictating membrane . This membrane helps keep the eye surface moist and functions like goggles to protect the eyes under water. • Just behind the eyes on the frog's head is a circular structure called the tympanic membrane . The tympanic membrane is used for hearing. • Locate the external nostrils . The small pair of openings near the tip of the nose allows air to enter or leave the mouth. • Pin each underlined feature above and wait for the instructor’s approval before moving on. Make sure all boxes above are initialed by your instructor before moving on.
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Frog External Anatomy · (group names, period, frog’s name) Frog External Anatomy 5. During breeding season, the base of a male frog’s thumb becomes thickened to form a little
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Biology – Frog dissection lab Thursday May 17, 2012
Perry High School
Mr. Pomerantz_______________________________________________________________________________Page 1 of 7
1
Review:
Dorsal = top side (back) Anterior = toward the head (front end)