The supraclavicular nerves (descending branches) arise from the third and fourth cervical nerves. They emerge beneath the posterior border of the sternocleidomastoideus (sternocleidomastoid muscle), and descend in the posterior triangle of the neck beneath the platysma muscle and the deep cervical fascia. Together, they innervate skin over the shoulder. The supraclavicular nerve can be blocked during shoulder surgery.
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