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I. Orientation of Pelvis |
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WebLecture Slide 35 |
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The perineum is one of the most difficult parts of the body to understand, learn and to dissect. There are several reasons for this. First, the muscles are extremely thin and friable, sometimes appearing to be only wisps of muscle fiber in older cadavers. In the dissection laboratory, students often plow through the structures looking for sizeable muscles as they appear only in textbooks (and lecture notes!). Second, access to the perineum is difficult in dissection. Approached through the pelvic diaphragm from the abdomen, limited space prevents access to perineal structures and the colon can take up much needed space. Approached from the external or inferior surface of the perineum, the thighs, especially in obese cadavers, can prevent easy access to the structures. Our advice is to learn the structures from this lecture and from dissection photographs BEFORE ATTEMPTING THE DISSECTION, realising that you are seeing exaggerated views in drawings or, in the case of photographs, specimens chosen specifically for demonstration of the perineum. Be prepared for extremely small and fragile muscles when dissecting in the laboratory. |
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