Frog DissectionPreparation

Podcast #1http://www.youtube.com/watch?v=u-LqS5AVRioExternal Overview

Name the sensory organs of the Frog

Describe the feet and legs of the frog. How is this advantageous?

What do most frogs eat? What kind of consumers are they?

What does it mean to be amphibious?

How is the frog’s tongue different from our tongue?

Do frog’s have teeth? What are they like?

Frog Dissection Podcast #2 http://www.youtube.com/watch?v=s0fZvyDXFKUPodcast #3 http://www.youtube.com/watch?v=33lisgYvwEA

Describe the skin of the frog

How do the muscles appear?

What is the difference between dorsal and ventral?

Dorsal Back means along length of spinal column. Ventral means along the belly side

Dissection Hints Steps to follow

Place the frog on its belly (ventral side) in the dissecting pan.

Examine the hind legs and front legs of the frog.  The hind legs are strong and muscular and are used for jumping and swimming.  The forelegs

provide balance and cushion the frog when it lands after jumping. 

Notice the difference between the toes of the hind legs and those of the front legs. 

Dissection HintsSteps to follow

Feel the frog's skin.  It is smooth, moist and thin. 

The frog can breathe directly through its skin as well as

with its lungs. 

Turn the frog onto its ventral side and notice the color difference

Is it a Boy or a Girl frog?

Female Frog Male Frog

Is it a Boy or a Girl frog?

Behind each eye find the circular eardrum called a TYMPANUM. 

The tympanum show the two openings into the nasal cavity. 

The nasal  openings, are also call EXTERNAL NARES. These are found toward the tipof the snout will closes when the frog is under water

Male Frog

On the male, the tympanum (eardrum) is larger than the eye. The tympanum is an external hearing structure in animals such as frogs, toads, insects, and mammals

In females, the tympanum is about the same size as her eye

In males, the tympanum is larger than his eye

Female Frog

Frog vs. Human

Compare AnatomyFrogs to Human