Muscles of the Trunk and Upper Limb 3. Using choices from the key, identify the major muscles described next: 1. a major spine flexor Key: biceps brachii 2. prime mover for pulling the arm posteriorly deltoid 3. elbow extender erector spinae 4. help form the abdominal girdle (four pairs of muscles) extensor carpi radialis extensor carpi ulnaris 5. extends and adducts wrist extensor digitorum superficialis 6. allows you to raise your arm laterally intercostals

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