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Fig. 6B. —Muscles of mastication in 7-year-old girl with left hemifacial microsomia. CT scan shows normal right lateral pterygoid muscle inserting along lateral surface of lateral pterygoid plate (straight arrow). On left, small and poorly formed lateral pterygoid muscle (arrowhead) can be identified by its insertion on hypoplastic lateral pterygoid plate. Lateral pterygoid muscle is difficult to distinguish from medial pterygoid muscle, which inserts into pterygoid fossa. Muscle lying lateral to lateral pterygoid fossa is temporal muscle (wavy arrow), which inserts inferiorly on dysplastic mandible.