Transcript Frog Dissection Run Through

Monday, 3/31/08
Warm-Up 3/31/08
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1. What did you think of the
dissection? What did you like? What
did you dislike? Which organs do you
remember? Why?
 Write at least 1 paragraph
 one person will be chosen to
answer
Pinning the Frog
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Rinse the frog in water.
Place it in the dissection pan on its dorsal
(back) side.
Pin the limbs to the dissection pan (This will
keep the frog in place).
Incision 1-Skin
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2
Incision 2- Skin
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4
Skin Separation
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5
6
First Muscle Incision
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7
8
Cutting The Chest Bones
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9
10
Horizontal Muscle Cut
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11
12
Muscle Separation
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13
14
LAYER 1: Liver and Heart
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Find each of these organs in the first
layer under the muscles.
1. LIVER
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The liver is a large, brownish colored
organ covering most of the body
cavity.
2. Heart
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It is a small triangular shaped organ
between the front legs and anterior to
the liver.
LAYER 2: Gall Bladder,
Stomach, and Small
Intestines
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Use the tweezers to lift up the liver to
reveal the second layer of organs.
3. Gall Bladder
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Examine the gall bladder. Under the
liver, we see a small, greenish sac.
This is the gall bladder.
4. Stomach
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The stomach looks like a sac on the
frog's left side (on your right). It is a
large firm organ.
5. Small Intestine
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The small intestine is a long, folded,
tube like organ that is posterior the
stomach.
It is similar in color to the stomach,
but smaller in diameter.
LAYER 3: Lung and
Pancreas
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Reveal layer three.
Remove the liver to see the organs in
layer three.
The liver is easier to remove if you
remove the gall bladder and heart at
this time.
6. Lung
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The lungs are difficult to locate in a
preserved frog.
They're at the anterior end of the body
cavity on either side of the heart.
7. Pancreas
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You can't see the pancreas without
lifting the stomach and intestines with
the forceps.
The pancreas is a thin, yellowish
ribbon.
Do you have a Male or a
Female?- Layer 4
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Male
Female
Let’s See What You Have
Learned… This is a Group
Challenge!
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The first group to put up their white
board with the correct answer gets a
point.
The winning group will win a prize!
How could you tell that the
frog was a boy or girl?
The presence/absence of eggs
What was the largest
organ in the frog?
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Liver
Which organs had two or
more parts?
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Liver
Lungs
Intestines
Is the heart anterior or
posterior to the lungs?
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anterior
What is the most
posterior part of the frog?
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The butt
What three pieces of safety
equipment did we wear?
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Goggles
Aprons
Gloves
What are the three tools
that we used?
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T-Pins
Tweezers
Scissors
Where was the
gallbladder located?
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Posterior to the liver
Where do we place the
pins in the frogs?
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One in each wrist, one in each leg,
and one through each flap of muscle
and skin
How many pins did we
use on the frog?
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6 t-pins
What was the smallest
organ we looked at?
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Gallbladder
Which organ looked like
noodles?
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intestines
Study this picture carefully
for a couple of minutes…
Label the Picture