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Laboratory 24. Posterolateral Triangle of the Neck
Step 1. Reflection of the Platysma Muscle

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If the skin of the neck has not been removed, cut and reflect it posteriorly (Figure 24.1, see Laboratory Twenty-Three). Next identify and reflect the platysma muscle superiorly towards the mandible. Be careful not to injure the structures which cling to the deep surface of this muscle, e.g., the cervical branch of the facial nerve and cutaneous branches of the cervical plexus.

Links and References:
Grant's: 8.1
Netter:21