Table 1:

Cisternal length and transition zone of cranial nerves V, VII, VIII, and IX^{^a}

	Cisternal Length	TZ
CN V: trigeminal nerve	8–15 mm^{^b}	1.13 mm (medial)^{^b}
	13.11 ± 1.12 mm (range, 11.9–15.2 mm)^{^c}	2.47 mm (lateral)^{^b}
	Motor root, 2–20 mm^{^d}	4.19 ± 0.81 mm^{^c}
CN VII: facial nerve	17.93 ± 2.29 mm (range, 14.8–20.9 mm)^{^c}	2.86 ± 1.19 mm^{^c}
	9.9 ± 3.03 mm (range, 4.78–20.13 mm) lateral side^{^e}	1.9 ± 1.14^{^e}
CN VIII: vestibulocochlear nerve	16.48 ± 1.78 mm (range, 14.2–19.2 mm)^{^f}	11.50 ± 1.56 mm^{^f}
CN IX: glossopharyngeal nerve	16.36 ± 2.53 mm (range, 14.2–19.9 mm)^{^c}	1.51 ± 0.39 mm^{^c}