Fig. 48-3. Six successively more superficial planes in the infratemporal region. A, Medial wall of infratemporal fossa (cf. fig. 42-11). B, Medial pterygoid muscle. C, Mandibular nerve and maxillary artery. Note the chorda tympani and the middle meningeal artery. D, lateral pterygoid muscle. The second part ofthe maxillary artery may be deep (as shown here) or superficial to the lower head of the lateral pterygoid muscle. The buccal nerve emerges between the heads of the lateral pterygoid. The masseteric nerve emerges above the upper head of the lateral pterygoid. E, Temporalis. The anterior fibers are attached to the ramus of the mandible. F, Masseter. The deep fibers (visible above) proceed directly inferiorward. Click for high resolution image.