The document outlines the key internal and external anatomy of frogs, including organs like the liver, heart, lungs, stomach, intestines, and reproductive systems. It describes external features such as the nictitating membrane that protects the eyes and the tympanum for hearing. The text also indicates how to determine the sex of a frog by examining the thumb and lists the major organs and their functions discovered during a frog dissection.

1. Frog Dissection

2. Nictitating Membrane
• Cleans the eye of debris
• Act as “swim goggles”
• Protect the eye

3. Tympanum
• Hearing

4. Male or Female?
• Sex can be determined
externally by looking at
the thumb
• What sex is your frog?

5. Internal Nares
• openings for the entry
or exit of air

6. Maxillary Teeth
• Sharp teeth in the
maxilla of a frogs mouth
that function in holding
captured prey

7. Vomerine Teeth
• Sharp teeth in the
maxilla of a frogs mouth
that function in holding
captured prey

8. Liver
• secrets bile needed for
the digestion of fats

9. Heart
• Pumping organ of the
circulatory system
• Has 3 chambers

10. Lung
• aid in supplying oxygen
to the body and getting
rid of carbon dioxide

11. Stomach
• food storage organ
• the first major site of
chemical digestion

12. Pancreas
• make insulin
• makes pancreatic juice
which helps with
digestion

13. Large Intestine
• Material that cannot be
digested passes through
here on the way to the
rectum and then the
cloaca.
• Water is absorbed here

14. Gall Bladder
• storage area for bile

15. Female Reproduction
Eggs Oviduct
female sex cells
Tubes of a female frog’s reproductive
system that carry eggs from the ovaries to
the cloaca

16. Male Reproduction
Testes Sperm Duct
Male sex organs that produce
sex cells (sperm).
Tubes that carry sperm to the
cloaca

17. Spleen
• stores and destroys old
blood cells

18. Kidney
• filter the blood and
remove the wastes to
make urine