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Monday, 3/31/08 Warm-Up 3/31/08 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 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 1 2 Incision 2- Skin 3 4 Skin Separation 5 6 First Muscle Incision 7 8 Cutting The Chest Bones 9 10 Horizontal Muscle Cut 11 12 Muscle Separation 13 14 LAYER 1: Liver and Heart Find each of these organs in the first layer under the muscles. 1. LIVER The liver is a large, brownish colored organ covering most of the body cavity. 2. Heart It is a small triangular shaped organ between the front legs and anterior to the liver. LAYER 2: Gall Bladder, Stomach, and Small Intestines Use the tweezers to lift up the liver to reveal the second layer of organs. 3. Gall Bladder Examine the gall bladder. Under the liver, we see a small, greenish sac. This is the gall bladder. 4. Stomach The stomach looks like a sac on the frog's left side (on your right). It is a large firm organ. 5. Small Intestine 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 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 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 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 Male Female Let’s See What You Have Learned… This is a Group Challenge! 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? Liver Which organs had two or more parts? Liver Lungs Intestines Is the heart anterior or posterior to the lungs? anterior What is the most posterior part of the frog? The butt What three pieces of safety equipment did we wear? Goggles Aprons Gloves What are the three tools that we used? T-Pins Tweezers Scissors Where was the gallbladder located? Posterior to the liver Where do we place the pins in the frogs? 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? 6 t-pins What was the smallest organ we looked at? Gallbladder Which organ looked like noodles? intestines Study this picture carefully for a couple of minutes… Label the Picture