The document discusses the anatomy of frogs, describing both their external and internal features. Externally, frogs have nostrils, an eardrum, and a nictitating membrane that protects their eyes. Internally, they have organs for digestion, respiration, circulation, and reproduction, including a three-chambered heart, lungs, liver, pancreas, intestines, kidneys, and sex organs like testes and ovaries.
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Home Learning Objects Worksheets Book: The Biology Corner (Worksheets) Anatomy Worksheets Frog Dissection: External and Internal
Frog Dissection: External and Internal
CCBYNCSA
Last updated
Jun 3, 2019
Shannan Muskopf
Granite City School District via Biology Corner
External Anatomy
1. Observe the dorsal and ventral sides of the frog. Dorsal side color ___________ Ventral side color ____________
2. Examine the hind legs. How many toes are present on each foot? ______ Are they webbed? _____
3. Examine the forelegs. How many toes are present? ________Are the toes webbed? _______
4. Use a ruler to measure your from the tip of the head to the end of the frog's backbone. Compare the length of your frog to other frogs
Your Frog (cm)
Frog 2
Frog 3
Frog 4
Frog 5
Average Length
5. Locate the frog's eyes, the nictitating membrane is a clear membrane that attached to the bottom of the eye. Use tweezers to carefully remove the nictitating membrane. You may also remove the eyeball.
What color is the nictitating membrane? _____________ What color is the eyeball? _________________
6. Just behind the eyes on the frog's head is a circular structure called the tympanic membrane. The tympanic membrane is used for hearing. Measure the diameter (distance across the circle) of the tympanic membrane. Diameter of tympanic membrane = ___________cm
7. Feel the frog's skin. Is it scaly or is it slimy? ____________
Anatomy of the Frog's Mouth
Pry the frog's mouth open and use scissors to cut the angles of the frog's jaws open. Cut deeply so that the frog's mouth opens wide enough to view the structures inside.
1. Locate the tongue. Play with the tongue. Does it attach to the front or the back of the mouth? __________ (You may remove the tongue). Draw a sketch of the tongue, paying attention to its shape.
2. In the center of the mouth, toward the back is a single round opening, the esophagus. This tube leads to the stomach. Use a probe to poke into the esophagus.
3. Close to the angles of the jaw are two openings, one on each side. These are the Eustachian tubes. They are used to equalize pressure in the inner ear while the frog is swimming. Insert a probe into the Eustachian tube.
To what structure does the Eustachian tube attach? _____________________
4. Just behind the tongue, and before you reach the esophagus is a slit like opening. (You may need to use your probe to get it to open up). This slit is the glottis, and it is the opening to the lungs. The frog breathes and vocalizes with the glottis. Use your probe to open the glottis and compare that opening to the esophagus.
5. The frog has two sets of teeth. The vomerine teeth are found on the roof of the mouth. The maxillary teeth are found around the edge of the mouth. Both are used for holding prey, frogs swallow their meals whole and do NOT chew. Run you finger over both sets of teeth and note the differences between them.
6. On the r
The digestive system is made up of the digestive tract and other organs that help the body break down and absorb food. It is a long, twisting tube that starts at the mouth and goes through the oesophagus, stomach, small intestine, large intestine and anus.
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2. External Anatomy
• External nares or nostrils - Anterior
openings for the entry or exit of air.
• Tympanic Membrane - The eardrum -
receives sound waves
• Nictitating Membrane - A transparent
part of a frog’s lower eyelid that moves
over the eye to clean it and protect it.
4. Mouth Anatomy
• Eustachian Tube Openings:
Openings in the mouth that lead
to tubes that connect to the
middle ear to equalize air
pressure
• Vomarine and Maxillary Teeth:
Used for holding prey
• Internal Nares (nostrils): Helps
with breathing
5. Mouth Anatomy
• Esophagus: Tube leading to
the stomach
• Tongue: Helps with grabbing
and swallowing prey
• Glottis: Tube leading to the
lungs
7. Internal Anatomy
• Heart - Pumping organ of the
circulatory system that has 3
chambers. The Left Atrium, The
Right Atrium, and the Ventricle.
• Stomach - Stores food and mixes
it with enzymes to begin
digestion.
8. Internal Anatomy
• Liver - Secretes bile and helps
digest food and filters blood.
• Lungs - Exchange point where
carbon dioxide leaves and
oxygen enters the blood;
helps the frog breathe.
9. Internal Anatomy
• Pancreas - Gland which secretes
digestive enzymes.
• Gall Bladder - Sac which stores
bile.
• Spleen - Organ in the frog’s
circulatory system that makes,
stores, and destroys blood cells.
10. Internal Anatomy
• Small Intestine - The principal
organ of digestion and
absorption of digested food.
• Large Intestine - Posterior
organ of the digestive system
which stores undigested food.
11. Internal Anatomy
• Cloaca - Organ through which
the frog’s digestive waste and
reproductive cells leave the
body.
• Fat Bodies - Masses of fat in the
body cavities of frogs. Needed
for hibernating and mating.
12. Internal Anatomy
• Kidneys - Organs that filter
the blood and remove the
wastes to make urine.
• Urinary Bladder - The organ
that collects and stores urine
until released.
13. Internal Anatomy
• Testes - Male sex organs that
produce sex cells (sperm).
• Ovaries - Organs of the female
reproductive system that
produce the eggs.
