Question 1983
{"accessible":false,"alternatives":[{"id":9865,"text":"CN V"},{"id":9866,"text":"CN VII"},{"id":9867,"text":"CN VIII"},{"id":9868,"text":"CN IX"}],"archived":false,"correctAlternativeId":9865,"explanation":"\u003cp\u003eThe \u003ca href=\"/articles/transition-zone-nerve\"\u003etransition zone\u003c/a\u003e\u0026nbsp;of a nerve describes a segment of a few millimetres in which the myelin sheath changes from a central to peripheral type.\u0026nbsp;This zone is susceptible to mechanical irritation and is implicated in \u003ca title=\"Neurovascular compression syndromes\" class=\"internal\" href=\"/articles/neurovascular-compression-syndromes\"\u003eneurovascular compression syndromes\u003c/a\u003e such as \u003ca href=\"https://radiopaedia.org/articles/trigeminal-neuralgia?lang=gb\"\u003etrigeminal neuralgia\u003c/a\u003e (CN V), \u003ca href=\"https://radiopaedia.org/articles/hemifacial-spasm?lang=gb\"\u003ehemifacial spasm\u003c/a\u003e (CN VII), \u003ca href=\"https://radiopaedia.org/articles/missing?article%5Btitle%5D=vestibular-paroxysmia\u0026amp;lang=gb\"\u003evestibular \u003c/a\u003e\u003ca href=\"https://radiopaedia.org/articles/missing?article%5Btitle%5D=vestibular-paroxysmia\u0026amp;lang=gb\"\u003eparoxysmia\u003c/a\u003e\u0026nbsp;(CN VIII) and \u003ca href=\"https://radiopaedia.org/articles/glossopharyngeal-neuralgia?lang=gb\"\u003eglossopharyngeal neuralgia\u003c/a\u003e (CN IX).\u003c/p\u003e\u003cp\u003eTransition zone locations:\u003c/p\u003e\u003cul\u003e\n\u003cli\u003eCN V:\u0026nbsp;4 mm from \u003ca title=\"root entry zone\" class=\"internal\" href=\"/articles/root-entry-zone\"\u003eroot entry zone\u003c/a\u003e\n\u003c/li\u003e\n\u003cli\u003eCN VII:\u0026nbsp;2 mm from root entry zone\u003c/li\u003e\n\u003cli\u003eCN VIII:\u0026nbsp;10 mm from root entry zone\u003c/li\u003e\n\u003cli\u003eCN IX:\u0026nbsp;1.5 mm from root entry zone\u003c/li\u003e\n\u003c/ul\u003e","id":1983,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1983","nextQuestionPath":"/articles/trigeminal-neuralgia/questions/978","relatedArticles":[{"id":1438,"title":"Hemifacial spasm","link":"/articles/hemifacial-spasm?lang=gb"},{"id":57135,"title":"Transition zone (nerve)","link":"/articles/transition-zone-nerve?lang=gb"},{"id":7174,"title":"Glossopharyngeal neuralgia","link":"/articles/glossopharyngeal-neuralgia?lang=gb"}],"alsoUsedIn":[],"stem":"\u003cp\u003eWhich of the following cranial nerves has a transition zone located 4 mm from its root entry zone?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/1983"}],"attemptsPercentages":[{"alternativeId":"9865","percentage":59},{"alternativeId":"9867","percentage":16},{"alternativeId":"9868","percentage":5},{"alternativeId":"9866","percentage":20}],"promptToLogin":false,"questionManager":false,"articleId":"trigeminal-neuralgia"}