Cranial nerve ix , xii

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Cranial nerve ix , xii

  1. 1. CRANIAL NERVE IX THE GLOSSOPHARYNGEAL NERVE
  2. 2. <ul><li>It is a mixed nerve ,carrying both sensory and motor fibres. </li></ul><ul><li>Nuclei : </li></ul><ul><li>Nucleus Ambiguus </li></ul><ul><li> Inferior Salivary Nucleus </li></ul><ul><li> Solitary Nucleus. </li></ul>
  3. 4. COURSE <ul><li>It arises from the medulla ,and then passes through the Jugular foramen of the skull ,between the IJV and the ICA. </li></ul><ul><li>It is accompanied by Cranial nerves X and XI. </li></ul><ul><li>It follows the ICA. </li></ul>
  4. 5. <ul><li>It passes under the Styloid process ,and then into the pharynx ,where it lies over the Stylopharyngeus muscle and the middle pharyngeal constrictor muscle. </li></ul><ul><li>It then passes undercover of the of the Hyoglossus muscle ,and is then distributed to the Palatine tonsil,and mucus memb of fauces,base of tongue ,and mucus glands of the mouth. </li></ul>
  5. 6. COMPONENTS OF THE GLOSSOPHARYNGEAL NERVE <ul><li>BRANCHIAL MOTOR COMPONENT :( SVE ) supplies the stylopharyngeus muscle. </li></ul><ul><li>VISCERAL MOTOR COMPONENT : ( GVE )parasympathetic innervation of smooth muscles and glands of pharynx and secretomotor to the parotid gland . </li></ul><ul><li>VISCERAL SENSORY COMPONENT :( GVA) This innervates the baroreceptors of the carotid sinus,and the chemoreceptors of the carotid body. </li></ul>
  6. 7. <ul><li>GENERAL SENSORY COMPONENT :( GSA )carries pain, temp, and touch from skin of ext.ear,internal surface of tympanic memb.,upper pharynx and post.1/3 rd of tongue. </li></ul><ul><li>SPECIAL SENSORY COMPONENT:(SA) </li></ul><ul><li>carrie taste sensation from the posterior 1/3 rd of the tongue . </li></ul>
  7. 8. IMPORTANT BRANCHES <ul><li>The Tympanic br.to the tympanic plexus in the middle ear. </li></ul><ul><li>Lesser petrosal N arises from this plexus and passes to the parotid gland. </li></ul><ul><li>Carotid br,w hich carries sensory fibres . </li></ul><ul><li>Nerve to the Stylopharyngeus </li></ul><ul><li>Pharyngeal brs </li></ul><ul><li>Lingual br ,which supplies the post 1/3 rd of the tongue. </li></ul>
  8. 9. <ul><li>C/C </li></ul><ul><li>The general sensory component mediates the afferent limb of pharyngeal reflex in which touching the back of the pharynx elicits the gag reflex . This is used to test the Glossopharyngeal nerve clinically. </li></ul>
  9. 10. CRANIAL NERVE XII <ul><li>THE HYPOGLOSSAL NERVE </li></ul>
  10. 11. <ul><li>Mainly motor </li></ul><ul><li>Arises from the medulla </li></ul><ul><li>Nucleus is the hypoglossal nucleus </li></ul>
  11. 12. FUNCTIONS <ul><li>It provides motor innervation to the muscles of the tongue except the Palatoglossus muscle which is innervated by the vagus nerve . </li></ul><ul><li>It controls the shape and movements of the tongue. </li></ul><ul><li>It is important for swallowing and articulation. </li></ul>
  12. 13. <ul><li>It arises in the medulla. </li></ul><ul><li>It leaves the skull through the hypoglossal canal. </li></ul><ul><li>Descends in the neck with structures like the ICA ,IJV,and Vagus nerve. </li></ul><ul><li>It then passes forwards on the side of the tongue </li></ul><ul><li>It is joined in the upper part of its course by C1 fibres . </li></ul>
  13. 14. <ul><li>The meningeal br. </li></ul><ul><li>The descending br. </li></ul><ul><li>Nerve to the Thyrohyoid muscle . </li></ul><ul><li>Muscular brs to the muscles of the tongue. </li></ul><ul><li>Nerve to the Geniohyoid muscle. </li></ul>IMPORTANT BRANCHES I
  14. 15. BRANCHES OF HYPOGLOSSAL
  15. 16. <ul><li>C/C: </li></ul><ul><li>Paralysis of the Hypoglossal nerve will cause deviation of the tongue to the affected side . </li></ul><ul><li>SO, to test the hypoglossal nerve , the patient is asked to stick out his tongue and then deviation ,if any, is noted by the weary and exhausted Medical Officer !!! </li></ul>
  16. 17. <ul><li>THE END ! </li></ul>

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