Pertinent landmarks useful during dissection should be exposed throughout the procedure. For operations involving the mandibular ramus/angle, the corner of the mouth and lower lip should be exposed within the surgical field anteriorly and the ear, or at least the ear lobe, posteriorly. These landmarks helps the surgeon to mentally visualize the course of the facial nerve and to see whether the lip moves if stimulated.
Figure 9- 2 Anatomic dissection of the lateral face showing the relationship of the submandibular gland, facial artery (FA) and vein (FV), retromandibular vein (RV), and marginal mandibular branch of the facial nerve (VII) (parotid gland has been removed). Only one marginal mandibular branch is present in this specimen and it is superior to the inferior border of the mandible.
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