Frog Dissection Review

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 frogs anatomy have in common with a
  humans?
• Frogs have all the same body systems as people
  and most of the same organs!
• How does a frogs anatomy differ from a humans?
• 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 frogs 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
7
(No Transcript)
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
Rectum
Large Intestine
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