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glossopharyngeal nerve & its relation to vagus


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glossopharyngeal nerve & its relation to vagus

  1. 1. Amna liaqatRoll#51BDS3rd yr
  2. 2. It is the Ninth cranial nerveIt has three components:1. Motor2. Secretomotor parasympathetic3. sensory It has three nuclei:1. Main motor2. Parasympathetic3. Sensory
  3. 3. 1.Main motor nucleusLies deep in medulla oblongata.Receives afferent fibres from bothcerebral hemispheres.Give efferent fibres to Stylopharyngeusmuscle.
  4. 4. 2.Parasympathetic nucleusIt give preganglionic efferent fibres to1. Tympanic branch of 9th nerve2. Tympanic plexus3. Lesser petrosal nerve The postganglionic fibres pass toParotid salivary gland.
  5. 5. 3.Sensory nucleus ofthe tractus solitariusGeneral sensation & taste sensationto posterior 3rd of tongue & pharynx.Afferent sensory fibres from theCarotid body & carotid sinus.
  6. 6. Emerges from medulla oblongatab/w olives & inferior cerebellarPeduncle.Passes laterally in post. Cranial fossaLeave the skull by juglar foramenThan it passes to the lateral side ofneck & gives branches.
  7. 7. 1.Tympanic branchSensory supply to middle ear2.Lesser petrosal nerveSecretomotor fibres for Parotid salivaryGland3.Phyrangeal branchesForm pharyngeal plexus with vagal &Sympathetic fibres
  8. 8. 4.Muscular branchesSupply to stylopharyngeus muscle5.Tonsillar branchesSupply tonsills & soft palate6.Lingual branchesSupply general & taste sensations toPost. third of tongue7.Carotid branchDescends on internal carotid artery& supplies the carotid body & carotidSinus.
  9. 9. It is the 10th cranial nerveIt arises from the same area of brainas of the Glossophyrangeal nerveIt also exit through juglar foramenIt has two components1. Motor2. sensory
  10. 10. Vagus nerve has three nuclei:1.Main motor nucleusEfferent fibres supply constrictormuscle of pharynx & intrinsic muscleof larynx.2.Parasympathetic dorsal motor nucleusReceives afferent fibres from1.Hypothalmus2.Glossopharyngeal nerve(from Carotid sinus & Carotid body)
  11. 11. It sends efferent fibres toinvoluntary muscles of bronchi,Heart,stomach,esophagus,small& large intestine.3.Sensory nucleusTaste sensations to epiglottis.
  12. 12. The glossopharyngeal & vagus nervesare related to each other through:The carotid branch of 9th nervecarries the sensation of anychange in blood pressure or inchemical constituents of blood fromCarotid body & carotid sinus throughafferent fibres.
  13. 13. These afferent fibres reachparasympathetic dorsal motornucleus of Vagus nerve.Vagus nerve inturn sends efferentFibres to the involuntary muscles ofHeart,which in turn results in either ofthe following accordingly:BradycardiaHypotensionSyncopeasystole
  14. 14. All of these show the predominantParasympathetic effect of Vagus nerveon heart.
  15. 15. CLINICAL NEUROANATOMY byRichard S.SnellB D Chayrasia’s HUMAN ANATOMYHead & Neck