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 ID: 474964
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Slide1
FROG DISSECTION
EXTERNAL AND INTERNAL ANATOMYSlide2
EXTERNAL ANATOMYNotice how thin the Skin is.Locate the external Nare
s or nostrilsLocate the Eye
s 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.Slide3
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)Slide4
HINDLIMBSExamine the muscular HindlimbsLocate the Thigh, Knee, and Ankle Joints
Examine the Webs of the foot.
How many Digits are there to each Hindlimb?Slide5
INSIDE THE MOUTHPry 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?Slide6
TEETHFind two bony knobs projecting from the upper roof of the mouthThese are the Vomerine teeth
.If you rub your finger along the inside of the jaw, you will feel the
Maxillary Teeth.Slide7
INTERNAL ANATOMYWith 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.Slide8
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 have
Ovaries which may have eggs)Cut away long fingerlike projections called Fat Bodies.Slide9
BRAINRemove skin from top of head and neck.Cut through Cranium
to expose brain.Slide10Slide11
R-R-R-RIBBIT