Lab Report

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| Dissection of the Sheep Brain | A&P Lab Report | | * Table of Contents I. Introduction 3 A. Background Information and Research 3 B. Objective 3 C. Hypothesis 3 II. Materials 3 III. Procedures 3 IV. Data and Observations 4 A. Observations 4 B. Data 4 VII. Conclusion 4 * Introduction Background Information and Research Brains of mammals have many features in common. Since we are unable to use human brains for our dissection, sheep brains are often dissected as an aid to better understand the mammalian brain structure. However, because sheep brains differ from human brains, comparisons of their structures may not be precise. Objective 1. Identify the major structures of the sheep brain; 2. Locate the larger cranial nerves of the sheep brain; 3. List several differences and similarities between the sheep brain and the human brain. Hypothesis If we dissect the sheep brain, then we will have a better understanding of similarities to a human brain. Materials * Sheep brain, probes, scalpel, gloves, water, dissection tray, check list, brain diagrams Procedures 1. Obtain a preserved sheep brain and rinse it thoroughly in water to remove as much preserving fluid as possible. 2. Examine the surface of the brain for the presence of meninges. If they are present locate dura mater, arachnoid mater, and pia mater. 3. Remove any remaining dura mater by pulling it gently from the surface of the brain. 4. Position the brain with its ventral surface down in the dissecting tray and locate the following structures on the specimen: a. Cerebral hemispheres b. Convolutions c. Sulci d. Longitudinal fissure e. Frontal lobe f. Parietal lobe g. Temporal lobe h. Occipital lobe i. Cerebellum j. Medulla oblongata Data

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