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FROG DISSECTION

FROG DISSECTION. EXTERNAL AND INTERNAL ANATOMY. EXTERNAL ANATOMY. Notice how thin the Skin is. Locate the external Nare s or nostrils Locate the Eye s and find the Nictitating Membrane , a 3rd eyelid - This covers the eyes when the frog is under water.

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FROG DISSECTION

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  1. FROG DISSECTION EXTERNAL AND INTERNAL ANATOMY

  2. EXTERNAL ANATOMY • Notice how thin the Skin is. • Locate the external Nares or nostrils • Locate theEyes and find the Nictitating Membrane, a 3rd eyelid - • This covers the eyes when the frog is under water. • Locate the Tympanic Membrane (large circular areas) or ear drums just posterior to the eyes.

  3. Locate the Shoulder, Elbow, and Wrist Joints of the Forelimbs. • How many Digits(fingers) are there to a Forelimb? • Near the end of the body is the opening of the Cloaca(feces, urine, and reproductive cells are expelled here)

  4. HINDLIMBS • Examine the muscular Hindlimbs • Locate the Thigh, Knee, and Ankle Joints • Examine the Websof the foot. • How manyDigits are there to each Hindlimb?

  5. INSIDE THE MOUTH • Pry the Mouth open. Cut Jaws at joints. Examine inside of mouth. • Eustachian Tubes are near the corners of the mouth . Insert probe into opening and push-observe where it comes out. • Two large Muscular Pads are in the roof of the mouth(eyes retract here when it blinks) • Locate Tongue.What unusual features do you notice?

  6. TEETH • Find two bony knobs projecting from the upper roof of the mouth • These are the Vomerine teeth. • If you rub your finger along the inside of the jaw, you will feel the Maxillary Teeth.

  7. INTERNAL ANATOMY • With forceps lift Skin over the frog’s abdomen and cut away. • The large brown gland of 3 lobes is the Liver. • Locate Gall Bladder(greenish sac under left lobes of liver. • Beneath liver is the Stomach. • Locate Small Intestine (attached to end of stomach) • Locate Large Intestine.

  8. Cut the Pericardium that surrounds the Heart and observe the three chambers. • Locate two Lungs. • Against the back body wall are two oblong Kidneys(males have oval Testis attached to each kidney-females haveOvarieswhich may have eggs) • Cut away long fingerlike projections called Fat Bodies.

  9. BRAIN • Remove skin from top of head and neck. • Cut through Cranium to expose brain.

  10. R-R-R-RIBBIT

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