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Laboratory 6. Arm

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The arm or brachium is that region of the upper extremity that extends from the shoulder to the elbow. It is divided into an anterior compartment and a posterior compartment (Figure 6.1). These compartments are formed by intermuscular septae, which extend laterally from the humerus to the deep investing fascia. This arrangement of muscles in the two compartments relates to the developmental anatomy of this region. Muscles principally involved in flexion at the elbow are found in the anterior compartment, while one muscle involved in extension at the elbow is located in the posterior compartment. During this dissection, the muscles, nerves, and vessels of each compartment will be studied.