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Submandibular approach

Ligating and dividing the facial artery and vein and then retracting the vessels superiorly

Superior subplatysmal dissection would expose the underlying marginal mandibular branch of the facial nerve (CN VII). This is not usually necessary.

By ligating and dividing the facial artery and vein and then retracting the vessels superiorly, the marginal mandibular branch of the facial nerve remains included in the superior flap and is thus protected.