<prompt> Parasympathetic fibers of vagus nerve supply -HeartParotid glandSubmandibular glandCiliary muscles  <response>: Ans. is a i.e., Heart o Functional components of vagus are:-1. Special visceral branchial efferent: Arise in nucleus ambiguus and supplies muscels of larynx, pharynx except stylopharyngeus, and soft palate except tensor veli palatini.2. General visceral efferent: Arise in dorsal nucleus of vagus and carry preganglionic parasympathetic fibers. These are distributed to thoracic heart, lung and abdominal up to right 23 of transverse colon viscera.3. General visceral afferent: Nucleus tractus solitarius lower part receives sensations from pharynx, larynx, trachea, esophagus and thoracic and abdominal viscera.4. Special visceral afferent: Nucleus tractus solitarius upper part receives taste sensation from posterior most part of tongue vallecula and epiglottis through internal laryngeal nerve.5. General somatic afferent: Distributed to skin of auricle, external meatus, and tympanic membrane and terminate in spinal nucleus of trigeminal. 