Medical Imaging Lab Hn Anatomy & Physiology Name______________________ Background information: Your text gives descriptions of X-rays, CT’s, Ultrasounds, MRI’s, PET scans, etc. Today you will be dissecting a gel-type “person” to get a view of what CAT scans and MRI’s show with their imaging techniques. OBJECTIVES: 1. Locate and describe anatomical planes. 2. Describe the relationship between your original sketch (made before you cut the gel “persons” into segments) and the sketches of the transverse sections. 3. Explain how this “transverse sectional anatomy” improved your understanding of how the gel person is structured 4. Explain how this dissetion relates to scanning medical images that might be made of your “gel person”. MATERIALS: gel “person”, white index cards, paper towels, ruler (metric), pencil, knife MAKING TRANSVERSE SECTIONS 1. Lay one index card in front of you so the long side is along the left and right and the short side is at the top and bottom. Use a metric ruler and pencil to mark off one index card into 1 cm segments. Start at the tip by making a line 1 cm from the top and proceed down the card. Number each segment by writing a number along the left edge of the card with your pencil. 2. Place a gel “person” on the index card that you have just marked off. Place the head of the “patient” at the most superior portion of the card. 3. Use a new index card, mark off 1 cm lines as you did in Step #1. Now sketch in the structures or “organs” you see inside the gel person. Keep the sketch simple but accurate. 4. Beginning at the top of the gel person’s head, use a knife to cut a transverse section along the first line on the underlying card. That is, cut a transverse section 1 cm from the top of the “head”. Place this section, inferior side up on a clean index card. Mark the number of the section (#1) along the left edge of this clean card. 5. Continue to cut sections in order: at the 2 cm mark, 3 cm mark, and so on, until the gel person’s body is completely section. After marking each section lay it on a clean index card. Three or four sections should fit on each card. Do not forget to mark the number of each section along the left edge of the clean card as you lay them down. 6. Make a sketch of each section on clean index cards and turn in with your names on it. 7. If you haven’t already, make a transverse section through a hollow organ. Now make a sagital section through the organ. Record your observations in # 5 below. 8. Discard the gel into the garbage. DO NOT PUT GEL INTO SINK. Return reusable materials to the baskets. DISCUSSION: 1. What observations did you make about the “hollow” organs? Could you tell they were hollow by looking at them before making your sections? 2. Did some of the “organs” fit entirely in a 1 cm segment? If an organ fit entirely in a segment, and no “cuts” were made through the organ, how could a clinician find out if there was any pathology in that organ? 3. Is it possible to determine the depth of the “organs” before you made the transverse section? 4. Record at least 3 other observations regarding this method to analyze the body. 5. Describe the differences between what is visible in a sagittal cut and a transverse cut. Is there a benefit to performing both types of cuts? Is one better than the other?
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