{"id":206023,"date":"2025-03-26T07:14:49","date_gmt":"2025-03-26T07:14:49","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206023"},"modified":"2025-03-26T07:14:52","modified_gmt":"2025-03-26T07:14:52","slug":"which-of-these-cranial-nerves-contains-preganglionic-parasympathetic-fibers-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/26\/which-of-these-cranial-nerves-contains-preganglionic-parasympathetic-fibers-2\/","title":{"rendered":"Which of these cranial nerves contains preganglionic parasympathetic fibers"},"content":{"rendered":"\n<p>Which of these cranial nerves contains preganglionic parasympathetic fibers? <\/p>\n\n\n\n<p> A. Optic, CNI <\/p>\n\n\n\n<p>B. Facial, CN VII <\/p>\n\n\n\n<p> C. Trigeminal, CN V <\/p>\n\n\n\n<p>D. Hypoglossal, CN XII<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is:<\/p>\n\n\n\n<p><strong>B. Facial, CN VII<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The <strong>cranial nerves that contain preganglionic parasympathetic fibers<\/strong> are part of the autonomic nervous system, specifically the <strong>parasympathetic division<\/strong>. These fibers originate in the brainstem and travel to ganglia before synapsing with postganglionic neurons that control various glands and smooth muscles.<\/p>\n\n\n\n<p>There are <strong>four cranial nerves that carry preganglionic parasympathetic fibers:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Oculomotor nerve (CN III)<\/strong> \u2013 Innervates the <strong>ciliary ganglion<\/strong>, controlling the <strong>pupil and lens<\/strong> for accommodation and pupillary constriction.<\/li>\n\n\n\n<li><strong>Facial nerve (CN VII)<\/strong> \u2013 Sends fibers to the <strong>pterygopalatine and submandibular ganglia<\/strong>, controlling <strong>lacrimal, submandibular, and sublingual glands<\/strong>.<\/li>\n\n\n\n<li><strong>Glossopharyngeal nerve (CN IX)<\/strong> \u2013 Targets the <strong>otic ganglion<\/strong>, influencing the <strong>parotid gland<\/strong>.<\/li>\n\n\n\n<li><strong>Vagus nerve (CN X)<\/strong> \u2013 Provides extensive parasympathetic innervation to the <strong>thoracic and abdominal organs<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Why the other options are incorrect:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A. Optic nerve (CN II)<\/strong> \u2013 This is purely a <strong>sensory nerve<\/strong> for vision and has <strong>no autonomic function<\/strong>.<\/li>\n\n\n\n<li><strong>C. Trigeminal nerve (CN V)<\/strong> \u2013 While it carries autonomic fibers from other nerves to their targets, it <strong>does not contain preganglionic parasympathetic fibers<\/strong> itself.<\/li>\n\n\n\n<li><strong>D. Hypoglossal nerve (CN XII)<\/strong> \u2013 This nerve is <strong>entirely motor<\/strong>, controlling the <strong>muscles of the tongue<\/strong> and having no parasympathetic fibers.<\/li>\n<\/ul>\n\n\n\n<p>Thus, <strong>the Facial nerve (CN VII) is the correct choice, as it carries preganglionic parasympathetic fibers to the pterygopalatine and submandibular ganglia.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Image Representation:<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/03\/image-1488.png\" alt=\"\" class=\"wp-image-206024\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which of these cranial nerves contains preganglionic parasympathetic fibers? A. Optic, CNI B. Facial, CN VII C. Trigeminal, CN V D. Hypoglossal, CN XII The correct answer and explanation is : The correct answer is: B. Facial, CN VII Explanation: The cranial nerves that contain preganglionic parasympathetic fibers are part of the autonomic nervous system, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-206023","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206023","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=206023"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206023\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206023"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206023"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}