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Trigeminal Nerve

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Anatomy

Publié dans : Sciences
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Trigeminal Nerve

  1. 1. Presented by : Nour Alhoda Youssef Allham Supervision: Dr. Ali Booker *Khalije-libya college Department of general medical science subject : General Anatomy Trigeminal Nerve
  2. 2. ● Introduction ● Trigeminal Nuclei ● Trigeminal Ganglion ● Divisions of Trigeminal ● References *Contents :
  3. 3. ● Trigeminal nerve (Dentists nerve) the fifth cranial nerve or simply (CN“V”) ● Its name trigeminal (Tri = three ) and (Geminus = twin = thrice-twinned ) ● Derives from the fact that each of the two nerves ( one on each side of the pons ) ● The largest of the cranial nerves *Introduction
  4. 4. * *Motor to : − Muscles of mastication − Tensor ville palatini , Tensor tympany − Anterior belly of digastrics − Mylohyoid *Sensory to : − Skin of face − Mucosa of cranial viscera − Except base of tongue and pharynx
  5. 5. ● A cranial nerve nucleus is a collection of neurons (gray matter) in the brain stem that is associated with one or more cranial nerves. ● Axons carrying information to and from the cranial nerve form a synapse first at these nuclei. ● Lesions occurring at these nuclei can lead to effects resembling those seen by the severing of nerves they are associated with. *
  6. 6. 1- Mesencephalic nucleus − Cell body of pseudounipolar neuron. − Relay proprioception from muscles of mastication , Extra ocular muscles , Facial muscles . Situated in midbrain just lateral to aqueduct. 2- Principal sensory nucleus − Lies pons lateral to motor nucleus. − Relays touch sensation. 3- Spinal nucleus − Extends from caudal end of principal sensory nucleus in pons to 2nd or 3rd spinal segment. − It relays pain and temperature. *Sensory Nuclei :
  7. 7. ●Innervates muscles of mastication and tensor tympani and tensor palatini. ●Derived from first branchial arch. ●Located in pons medial to principle sensory nucleus. *
  8. 8. ● Semilunar or Gasserian ganglion. ● Cresentric in shape with convexity anterolaterally . ● Contains cell bodies of pseudounipolar neurons . ● Location : lies in a bony fossa at apex of the petrous temporal bone on floor of middle cranial fossa , just lateral to posterior part of lateral well of the cavernous sinus . *
  9. 9. ● Coverings : covered by dural pouch (Meckles cave or cavum trigeminal) − Cave lied by pia and arachoid thus the ganglion is bathed in CSF ● Arterial supply : ganglionic branches of internal carotid artery , middle meningeal artery and accessory meningeal artery.
  10. 10. −Superiorly : ● Superior petrosal sinus ● Free margin of tentorium cerebelli −Inferiorly : ● Motor root ● Greater petrosal nerve ● Petrous apex ● Foramen lacerum −Medially : ● posterior part of lateral well of cavernous sinus ● Internal carotid artery with its sympathetic plexus −Laterally : ● Uncus of temporal lobe ● Middle meningeal artery and vein ● Nervous spinosum *
  11. 11. ●The sensory supply from the face comes from its three major branches : 1- The Ophthalmic Nerve (V1) V2))2- The Maxillary Nerve 3- The Mandibular Nerve (V3) *
  12. 12. ● Smallest division. ● First division . ● Sensory only. ● Supplies : Eyeballs , Conjunctive , Lacrimal gland , Mucosa of nose and paranasal sinus , Skin of forehead eyelid and Nose . *
  13. 13. ● Arises : Upper part of the semi lunar ganglion as a short , flattened band pass forward along the lateral wall of the Cavernous sinus. ● Before entering the orbit through Superior orbital Fissure it divides into three branches : 1- lacrimal Nerve 2- Frontal Nerve 3- Nasociliary Nerve
  14. 14. ● Second division of trigeminal nerve ● Pure sensory ● Supplies derivatives of maxillary process and frontnasal process *
  15. 15. Trigeminal ganglion ( middle cranial fossa) Lateral wall of cavernous sinus Foramen rotundum Pterigopalatine Fossa In groove on posterior surface of maxilla Through inferior orbital fissure into orbit as Infra orbital N. Through infraorbital foramen on face *
  16. 16. ● Its the largest branch of trigeminal nerve. ● It is a Mixed Nerve with two roots : 1- Large sensory root . 2- Small motor root . ● The sensory root of the mandibular division originates at the (Inferior angle of the Trigeminal ganglion . ● The motor arises in the motor cells located in the Pons and Medulla oblongata . ● The two roots emerge from the cranium separately through the Foramen Ovale ( The motor root lying medial to sensory). ● They unite just outside the skull and from the main trunk of the third division. *
  17. 17. *
  18. 18. 1- Trunk (undivided) ● Nervous Spinosum. ● Nerve to medial Pterygoid. 2- Anterior Division ● Mesenteric Nerve. ● Deep temporal Nerve . ● Nerve to lateral Pterygoid. ● Buccal Nerve. 3- Posterior Division ● Auriculo Temporal Nerve. ● Inferior Alveolar Nerve. ● Lingual Nerve. *
  19. 19. It supplies: ● The teeth and gums of the mandible. ● The skin of the temporal region . ● The auricular. ● The lower lip. ● The lower part of the face . ● Muscles of mastication . ● It also supplies the mucous membrane of the anterior two- thirds of the tongue. *
  20. 20. ● Greys anatomy. ● Snells anatomy. ● Head and Neck Anatomy . ● Head , Neck and Dental tomy. *

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