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Laboratory 24. Posterolateral Triangle of the Neck
Step 3. Cutaneous Branches of the Cervical Plexus

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Next, identify the transverse (or anterior) cervical nerve (C2, C3). As its name implies, it courses transversely across the sternocleidomastoid muscle to provide cutaneous sensory innervation over the anterior region of the neck.

Identify the supraclavicular nerve (C3, C4). It has three large branches: the medial supraclavicular nerve, intermediate supraclavicular nerve, and lateral supraclavicular nerve. These nerves emerge at Erb's point usually from a short common trunk. The nerves lie deep to the platysma muscle. They innervate the skin of the base of the neck and the superior aspect
of the pectoral and deltoid regions of the thoracic wall.

Links and References:
Grant's: 8.4