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Appendicular Skeleton

Appendicular Skeleton - Lab 3 Appendicular Skeleton...

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Lab 3 Appendicular Skeleton Appendicular Skeleton Laboratory #3 ASSIGNED READINGS Lab Manual – pages 45 – 64 & 93 – 106 ASSIGNMENT DUE OCTOBER 17 th AT THE BEGINNING OF LECTURE Lab Manual – pages 59 – 64 & 107 - 109 - you must turn in originals or photcopies of the pages. Do not type up the answers and turn them or you will receive no credit on the assignment. Please be sure to put your TF’s name at the top of the page and staple the pages together. INTRODUCTION The skeleton forming the pelvic girdle, the pectoral girdle and the limbs is called the appendicular skeleton. The pectoral girdle of mammals is greatly simplified into the scapula. In humans, the scapula is connected to the sternum via a robust clavicle. (Many of you have probably broken either a clavicle or dislocated the joint between your scapula and clavicle (acromioclavicular joint)). The head of the humerus articulates proximally with the glenoid fossa of the scapula, and distally with the ulna (at the olecranon fossa) and the radius. The ulna has a long olecranon process, which serves as an in-lever for the triceps muscles that extend the elbow joint to support body weight. In many quadrupedal mammals the ulna is the primary weight bearing bone of the distal forelimb. The radius plays a major role in pronation and supination of the forearm (pronation rotates your palm backward/supination rotates your palm forward). Compare the relative length of the olecranon process in the cat to the human?
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