External Anatomy
Frog Dissection for Biology 110
Penn State Altoona Biology
Penn State Altoona
3000 Ivyside Park
Altoona, PA 16601-3760
I.) External Anatomy
1. Place the preserved frog in a dissecting tray.
2. Identify the eyes, which have a non-moveable upper and lower lid, but can be covered with a nictitating membrane which serves to moisten the eye.
3. Locate the tympanum behind each eye.
4. Examine the external nares (nostrils). Insert a probe into the external nares and note that it protrudes from one of the paired small openings, the internal nares inside the mouth cavity.
5. Identify the paired appendages. The short forelimb consist of an upper arm (forearm) and a hand. The hand has four digits and a rudimentary vestigial thumb. The hind limb consists of a thigh, shank, and a foot. The foot has five digits and a rudimentary sixth digit.
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