COOV-FROG Dissection Terms By Mrs. Coover

Welcome to COOV-FROG! You are about to learn a lot about the anatomy of a frog!

After you click on the “next slide” button, a word will come up. Write down this word. Click on the Kermit, and the function of that word will come up. Write this down. Before clicking the “next slide” button, look for that term on your diagram of the frog.

Part One: External Anatomy

Tympanic Membrane This is the external eardrum of the frog. It is a flat round spot behind the frog’s eye. It vibrates and the frog can detect different sounds.

Nostrils or External Nares The frog breathes air in through nostrils located on the top of its head. The nostrils open into the mouth cavity.

Nictitating Membrane This is a clear eyelid that shuts from the bottom. It covers the frog’s eye when it goes under water.

Webbed Feet A frog has webbed feet for swimming.

Skin The frog has thin skin with many blood vessels. The frog can absorb oxygen directly from the air through this skin, if it is moist.

Eustachian Tube Opening These holes are located behind the eardrum and they lead into the mouth cavity. The tubes allow the frog to equalize the pressure as it dives underwater.

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Part Two: Mouth Cavity

Internal Nares These holes bring in air to the mouth cavity.

Vomerine Teeth These larger teeth are clustered in two bumps on the roof of the frog’s mouth.

Maxillary Teeth These smaller teeth line the upper jaw, or maxillary bone. Both sets of teeth are for catching and holding prey.

Tongue The frog’s tongue is attached at the front of the mouth so it can be flipped out to catch prey.

Esophagus This opening is a wide, elastic slit that opens to the digestive cavity.

Glottis The glottis is a smaller slit that opens into the lungs.

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Part Three: Digestive Organs

Esophagus This is the tube that leads from the mouth to the stomach.

Stomach The stomach is the organ that mechanically digests food.

Small Intestine The small intestine chemically digests food. Food exits the stomach into this narrow tube.

Large Intestine This fatter, shorter tube extends from the small intestine and continues the digestion process. Water is absorbed.

Liver The liver is a large organ that produces bile for digestion. Bile breaks down fat. The liver is divided into three large lobes.

Gall Bladder This is a sac that stores the bile produced by the liver. It is found near the liver in the frog’s cavity.

Pancreas The pancreas is a long, narrow, flat organ that aids in digestion. It secretes enzymes that digest food.

Hi Ho! Isn’t this stuff fun?

Part Four: Cardiovascular System

Heart The frog’s heart is located in the center of the chest cavity. It has three chambers.

Ventricle The ventricle is the larger chamber that pumps blood throughout the frog’s body.

The heart also has two chambers called the auricles. They receive blood from the lungs or from the rest of the body.

Lungs The lungs absorb oxygen From the air. Blood running Through the lungs takes The oxygen to the rest of the body. The frog has two lungs.

Veins and Arteries Veins carry “used” blood back to the heart. Arteries carry blood with oxygen to the body parts.

Kidneys The two kidneys are located in the back of the cavity. They filter the blood, removing nitrogenous wastes which end up in the urine.

Spleen The spleen “recycles” old blood Cells. When you dissect it will appear dark bluish and round.

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Part Five: Reproductive System

Male Frog Large Vocal Sacs Testes

The testes are the male reproductive organ. They produce sperm cells.

Female Frog Ovaries Oviduct Eggs

Ovaries The ovaries produce and hold the eggs.

Oviduct The oviduct is the passageway for the eggs to the cloaca, where they will be released into the water.

Now you know the functions of all Of the organs in my body. You and I have a lot of these organs in common! That’s why you study about me.

Now you should be ready to dissect the frog. Have fun and learn a lot! You will have a hands-on test when you are done.

Go to this web site (on the internet) to learn more: go/frog/home.html

To beginning The End “See ya!”