The Skeletal System 9. Why is the pectoral girdle more free than the pelvie gird

Question

The Skeletal System 9. Why is the pectoral girdle more free than the pelvie girdle? 10. A hip replacement is not performed properly, and the right hip is not aligned to the left hip by just 1 em. What would be the effects on standing, walking, and climbing stairs? Do you think this condition might be quite painful? 11. Why is falling more dangerous for the elderly than the young? 12. Name the opposite joint movement and give an example of each a. Supinate b. Adduct c. Flex 13. For each joint, name a bone that articulates with the following bone: shoulder: humerus with elbow: radius with wrist: radius with hip: coxa with knee: femur with ankle: tibia with CREDITS Figure le Gene Cox/Science 1d 0 2009 Hilary B. Price. Distributed by King Features Syndicate, Ine. ence Source; Figure ld Roseman/Custom Medical Stock Photo; Figure 2

Explanation / Answer

9. The right and left pectoral girdle can operate independently as they are not attached to each other. The calvicle of each pectoral girdle is attached to axial skeleton by a highly mobile joint. This allows the extensive mobility of the shoulder and upper limb.

Unlike the bones of pectoral girdle, the bones of pelvis are strongly united to each other forming a weight bearing immobile structure. Thus pelvic girdle provides strong foundation for the upper body to rest on top of the mobile lower limbs.

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