1. Frog Dissection
Fall 2000
Jenna Hellack

2. Frog legs
Hindlegs are strong and muscular because they are used for jumping
Forelegs provide balance and cushion the frog when it lands after jumping

3. Frog Toes
Fingers
Toes

4. Frog Eye The frog has large bulging eyes The frog has 3 eyelids
2 outer ones are the color of the frog’s body and do not move
3rd eyelid is a transparent membrane that protects the eye while permitting the frog to see under water
It also keeps the eye moist when the frog is on land

5. Eardrum and External Nares
Behind the eye is the circular eardrum
2 openings in the nasal cavity-external nares are found toward the tip of the snout
These will close when the frog is under water

6. The Frog
Eye
Nasal Openings
Eardrum
forelegs
hindlegs

7. Frog Skin Smooth, moist, and thin
Frog can breathe directly through skin as well as with lungs

8. Coloration
Notice the difference in coloring between the belly and the rest of the frog’s body

9. Frog Tongue Attached to the front of the mouth
Sticky- used to catch insects

10. Frog Teeth Ridges along the inside of upper jaw are maxillary teeth
2 vomerine teeth are located toward the front of the upper jaw

11. Gullet & Eustachian tubes
The gullet (throat) is the wide opening that leads to the esophagus
On both sides of the gullet near the jaw hinges are openings to the Eustachian tube.
These lead to the eardrum
Gullet

12. Frog Mouth
Gullet

13. Female with eggs
A female frog has ovaries which are easily identifiable if engorged with eggs.

14. Male
The male's testes are a bright orange color.
Testes

15. Liver: The liver secretes bile to aid in digestion of fats.

16. Gall Bladder 44. Gall bladder Greenish sac attached to the liver40 38 44 46 51 49 47 52 55 56 39 42 43 50
44. Gall bladder
Greenish sac attached to the liver
It stores bile, which breaks down fats during digestion

17. Stomach Below the liver Large and white
On the right side as you look at the frog
Connects to the small intestine

18. Small Intestines
The straight part of the small intestine is called the duodenum
The coiled section is the ileum

19. Mesentery & Ileum
The coils of the ileum are connected by thin, transparent membranes called mesenteries.

20. Large Intestine
The small intestine widens to form the large intestine.
The lower portion of the large intestine is called the cloaca.

21. Pancreas
In the mesentery along the inner curve of the stomach is the pancreas which secretes digestive enzymes and insulin into the duodenum.

22. Spleen 40 38 44 46 51 49 47 52 55 56 39 42 43 50
Spleen
In the mesentery of the coiled part of the small intestine
Reddish, spherical structure
The spleen is an organ in the frog’s circulatory system that makes, stores, and destroys blood cells

23. Lungs
2 Lungs
Reddish-brown saclike structures

24. Frog Heart 3 chambers 2 upper chambers- right and left atria
Lower chamber- ventricle

25. Kidney
2 dark-red kidneys attached to the back wall of the abdominal cavity. Kidneys filter out impurities from the blood.

26. Urinary Bladder Urinary bladder
Urinary bladder empties into the cloaca
Ureters-tubes leading from each kidney to the bladder

27. Frog internals- female
45. Stomach
46. Small intestine
47. Large intestine
48. Pancreas
49. Spleen
51. Fat bodies
52. Urinary bladder
58. Ovary
59. Oviduct

28. Internal Organs

29. Metamorphosis