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Fig. 1C —Anatomy of masticator space in healthy 34-year-old man. LP = lateral pterygoid muscle, M = masseter muscle, MP = medial pterygoid muscle, P = parapharyngeal space, Pa = parotid gland, T = temporalis muscle. Contrast-enhanced axial (A) and coronal (B) CT images and unenhanced axial (C) and contrast-enhanced coronal (D) T1-weighted images. Internal maxillary artery (horizontal arrows, A and B) emanates from external carotid artery (vertical arrow, A), entering masticator space deep in relation to neck of mandible. Mandibular nerve exits trigeminal ganglion (horizontal arrow, D) and enters masticator space (arrowheads, C and D) through foramen ovale (vertical arrow, B), lying between medial and lateral pterygoid muscles. Vertical arrows in C show pterygopalatine fossae, and oblique arrows in C and D show zygomatic arch.