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9. Distinguish between the true pelvis and the false pelvis. 10. Use letters from the key to identify the bone markings on this illustration of an articulated pelvis. Make an educated gues as to whether the illustration shows a male or female pelvis and provide two reasons for your decision. Key: a. acetabulum b. anterior superior iliac spine (fossa) C. iliac crest d. iliac fossa ischial spine f. pelvic brim g. pubic crest (socket pubic symphysis 1. sacroiliac joint j. sacrum This is a (female/male) pelvis because: 11. Deduce why the pelvic bones of a four-legged animal such as the cat or pig are much less massive than those of the human 12. A person instinctively curls over his abdominal area in times of danger. Why? 13. For what anatomical reason do many women appear to be slightly knock-kneed? How might this anatomical arrangement contribute to knee injuries in female athletes? 14. What structural changes result in fallen arches