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Laboratory 24. Posterolateral Triangle of the Neck
Step 2. Boundaries of Posterolateral Triangle

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Identify the boundaries of the posterolateral triangle (Figure 24.1).
The floor of the triangle is made up of deep investing fascia which covers prevertebal muscles. The roof is formed by skin, platysma muscle, and fascia which spans between the trapezius and sternocleidomastoid muscles.

Links and References:
Grant's: 8.1