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Frog Dissection Review

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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! – PowerPoint PPT presentation

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Title: Frog Dissection Review


1
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
  • no external ear
  • third eyelid
  • they are also cold blooded

2
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

3
Materials
  • Preserved Frog
  • Dissecting Tray and Paper Towels
  • Dissecting Kit pins, forceps, scissors, probe

4
Step One
  • Determine frogs sex males have thick pads on
    thumbs males are often smaller than females.
  • Male is on the right

5
Step Two
  • Locate external features of frog
  • Mouth, external nares, tympani, eyes and
    nictating membranes

6
Step Three
  • Cut the hinges of the mouth and open it wide
  • Locate the structures inside the mouth Vomerine
    teeth, Maxillary teeth, Internal nares, Tongue,
    Eustachian tubes, Esophagus, and Glottis.

Internal nares
Vomerine Teeth
7
  • Look for the opening to the frogs cloaca,
    located between the hind legs. Cut from where
    hind limbs meet to jaw.
  • Then cut through the breast bone and muscle.

8
Step Five
  • Locate organs of digestive system esophagus,
    stomach, small intestine, pancreas, liver, gall
    bladder, rectum, cloaca

9
Rectum
Large Intestine
10
Step Six
  • Locate the circulatory organs veins and
    arteries, heart with right and left atrium and
    one ventricle

11
Male or Female Reproductive Parts
Fat Bodies
12
Clean-Up
  • Clean up tools
  • Wrap-up frog and organs in a paper towel
  • Hold frog and take off gloves and wrap gloves
    around frog
  • Dispose of frog/gloves in trash can
  • Put away tools
  • Clean up any remaining debris
  • Wash hands

13
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

14
Finished identifying external organs and organs
of the mouth?
  • Quiz one another over the organs and their
    functions until everyone is familiar with them
  • I will ask students within your group to either
    identify the organ or tell me its function so
    know your stuff.
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