![]() In males, the thumb is thickened and large.Ĥ. Check to see if the hindlegs are webbed.Į. Count how many digits there are on the foreleg and hindleg.ĭ. Measure the length of the whole frog from nose to legs stretched out behind.Ĭ. Measure the length of the foreleg and hindleg.ī. Carefully examine the legs of the frog: Record the answers to the questions in Part 1 of the questions section.Ī. Locate the following structures on your own specimen and label them on the picture in question 9 of Part 1 of the questions section: eyes, nostrils, tympanic membrane, nictitating membrane, thumb, foreleg, and webbed hindleg.ģ. Refer to the diagram of the external structures as needed.Ģ. You will be finding and identifying distinctive structures. Place a frog, dorsal side up, in a dissecting pan. Although the label lines may be horizontal, diagonal, or vertical, the label writing must always be horizontal. The line should not have arrows on them and should go directly to the object they indicate and touch it or be drawn into it. Making and labeling drawings for dissection labs:Ī) Make drawings as accurate as possible to what you actually see.ī) When adding labels, the label line should be straight and should not cross each other. Gloves: It is advisable to buy gloves and use them for dissecting.ĥ. Important: Whenever using scissors to cut into a specimen, make sure to keep the tip of the scissors pointed up so as not to dig down into the specimen, damaging the organs to be viewed.Ĥ. Dissecting involves the use of sharp cutting instruments like the scalpel and scissors. Ventral – the stomach or lower surface of an organismĢ. To successfully follow dissection, it is essential to be familiar with the following terms:ĭorsal – the back or upper surface of an organism Although the salamander might be more “typical” amphibian, the frog is fun to dissect and a good learning experience.ġ. To learn and practice dissection technique.įrogs are part of phylum Chordata and are in the class Amphibia. To assess the function of structures from observing the actual anatomy of the organism.ĥ. ![]() To locate the structures, organs, and systems of the frog.Ĥ. ![]() To be acquainted with the internal anatomy of the frog.ģ. To be acquainted with the external anatomy of the frog.Ģ. PROBLEM: What are the external an internal features of the frog?ġ.
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