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learning objectives to posterior triangle

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show The sternocleidomastoid muscle. CN XI (the spinal accessory n.)  
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What does the sternocleidomastoid muscle divide the neck into?   show
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List the boundaries of the posterior triangle.   show
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What structure divides the posterior triangle into two subtriangles?   show
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Name these two smaller triangles that the posterior triangle is split into.   show
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List at least one important structure in the lower of these two triangles of the posterior triangle   show
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show The brachial and cervical plexuses.  
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show Cervical plexus = C1-C4; the brachial plexus = C5-T1.  
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Which of these two plexuses is purely sensory?   show
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Be able to label the muscles that form the floor of the posterior triangle, from inferior to superior.   show
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Between which two muscles is the brachial plexus located?   show
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Where is the scalenus posterior located?   show
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Name the nerve that can be found lying superficial to the scalenus anterior?   show
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Name the nerve superficial to the levator scapulae?   show
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