General afferent fibers are responsible for perceiving touch, pain, temperature, pressure, vibration and proprioceptive sensation from the posterior ear, external auditory meatus, and posterior and the external surface of tympanic membrane. Struggling with cranial nerves anatomy? Learn faster with our cranial nerves quizzes and labeling exercises! This means it is responsible for not only carrying motor signals to the organs it innervates, but it also carries sensory information from these organs back to the central nervous system. The vagus nerve is a mixed nerve, as it contains both afferent (sensory) and efferent (motor) fibers. The vagus nerve, or the 10th cranial nerve (CN X), is primarily associated with the parasympathetic division of the autonomic nervous system, however, it also has some sympathetic influence through peripheral chemoreceptors. This article will review the anatomy of the vagus nerve. Vagotomy, unilateral and bilateral lesions General visceral efferent - parasympathetic division that simulates smooth muscle and glands of the pharynx, larynx, thoracic and abdominal organs
Special afferent - information about taste General visceral afferent - information from the aortic body, esophagus, lungs, bronchi, heart, intestines General sensory afferent fibers - sensory information from larynx, auricle, external acoustic meatus, dura mater of the posterior cranial fossa In the abdomen: gastric, celiac and hepatic branches In the thorax: inferior cardiac nerve, anterior bronchial branches, posterior bronchial branches, esophageal branches In the neck: pharyngeal, superior laryngeal, recurrent laryngeal nerves superior cardiac branches In the jugular fossa: meningeal, auricular branches Spinal trigeminal nucleus - receives general sensory afferent fibers Solitary nucleus - receives special gustatory afferent from the tongue and visceral afferent fibers from organs Nucleus ambiguus - sends efferent motor and parasympathetic fibers to the heart One nerve in particular is working diligently, this is the vagus nerve.ĭorsal nucleus - sends parasympathetic fibers to the intestines The ‘rest and digest’ period is well underway. The parasympathetic nervous system is busy slowing your heart rate, regulating your breathing and shouting out orders to the organs of your digestive system. While you may think your body is as relaxed as you are, in fact, one of the divisions of your nervous system is hard at work. You feel completely at rest, so much so, that you begin to doze off in and out of sleep.
You’ve just eaten a delicious three course meal and now you’re sitting down on the couch to unwind and relax.
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