1. Frog Dissection Review
Objectives:
Describe the appearance of various organs found in the frog
Name the organs that make up various systems of the frog
Discuss frog adaptations

2. Frog Dissection Review
What does a frog’s anatomy have in common with a human’s?
Frogs have all the same body systems as people and most of the same organs!
How does a frog’s anatomy differ from a human’s?
Frogs have:
a cloaca
three-chambered heart
unique teeth – vomerine and maxillary
no external ear
third eyelid – nictitating membrane
they are also cold blooded

3. Step One
Determine frog’s sex: males have thick pads on thumbs; males are often smaller than females.
Male is on the right

4. Step Two Locate external features of frog
Mouth, external nares, tympani, eyes and nictating membranes
Tympanic
membrane
External
Nares
Nictitating
membrane

5. Materials
Dissecting Kit: pins, forceps, scissors, probe

6. Step Three
Locate the structures inside the mouth: Vomerine teeth, Maxillary teeth, Internal nares, Tongue, Eustachian tubes, Esophagus, and Glottis.
Internal nares
Internal
nares
Maxillary
teeth
Vomerine Teeth
Vomerine
teeth
Eustachian
tube
Glottis
Glottis
Esophagus
Tongue

8. Step Five
Locate organs of digestive system: esophagus, stomach, small intestine, pancreas, liver, gall bladder, lungs
lungs
Liver
Gall bladder
Pancreas
Stomach
Small
intestine

9. Fat bodies
Spleen
Large Intestine
Rectum
Large
intestine
Small Intestine

10. Step Six
Locate the circulatory organs: heart with right and left atrium and one ventricle
Left
atrium
Ventricle
Right
atrium

11. Male or Female Reproductive Parts
testis
Fat Bodies
Fat bodies
ovaries

12. Frog Anatomy Wrap-up What are the functions of the following organs:
1. Cloaca
Organ that eliminates urine, feces and sperm/egg
2. Tympanum
External eardrum of the frog; help with hearing
3. Nictating Membrane
Third eyelid that protects while eating and under water
4. Vomerine Teeth
Teeth located on roof of mouth that help grab on to prey