A modified neck dissection is begun by elevating the skin flaps (deleted for clarity) beneath the platysma anteriorly and posteriorly, exposing the deep cervical fascia, external jugular vein and cervical plexus cutaneous branches.
The fascia of the digastric (submandibular) triangle is dissected downward, taking care to stay below the marginal mandibular nerve. The sternocleidomastoid is dissected off the deep layer of investing fascia and retracted posteriorly.
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