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Innervation

Oral surgery innervation

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nardeenboutros
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27 views9 pages

Innervation

Oral surgery innervation

Uploaded by

nardeenboutros
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Oral surgery lnnervation 2OZ2ZS2ZO23 She Frigeminal newe P It is the fifth cranial nerve and the largest of all the cranial nerves Pb It is called so because of its three main divisions i.e. the Ophthalmic, Maxillary & Mandibular nerves P It is a mixed nerve (made of large sensory part and small motor part) e The sensory root arises from the Trigeminal (Gasserian ganglion which fills the trigeminal impression in the floor of the middle cranial fossa e The motor root arises from motor cells in the Pons & Ophthalmic nerve — 1* division Maxillary nerve — 2"! division Mandibular nerve —> 3" division = ——-—— Page1 & It leaves the middle cranial fossa, but before leaving it gives off the Middle Meningeal nerve which supply the dura mater. > It crosses the pterygopalatine fossa, and then enters the orbit through the inferior orbital fissure » It is now termed as the infraorbital nerve. > It passes through the infra orbital groove &canal in the floor of the orbit & appears on the face through the infi to give sensory fibers to the skin of the f nose Branches 1- Middle meningeal nerve orbital foramen 2- Twigs to the sphenopalatine ganglion 3- Zygomatic nerve 4- Posterior superior alveolar nerve 5- Infra-orbital nerve e 1- Middle sup alveolar nerve e 2- Ant superior alveolar nerve e 3- Terminal branches : ¢ Inferior palpebral nerve Lateral nasal nerve © Superior labial nerve Page 2 = —=s B.N. | 2018 I. Branches in the Middle cranial fossa 1. Middle Meningeal nerve _ Supplies ; the dura mater HJ. Branches in the Pterygopalatine fossa 1. Vhe_Ganglionic branches (The twigs to the Sphenopalatine ganglion): They are 2 short trunks that unite in the pterygopalatine ganglion and are then redistributed into several branches: © Sensory fibers distributed in several branches © Postganglionic s etomotor fibers from the lacrimal gland through communication between lacrimal nerve and ZG (zygommatic communicating) nerve 2. The Zygomatic nerve: & It arises in the Pterygopalatine fos the inferior orbital fissure a and enters the orbit through & It divides into 2 branches that penetrate the zygomatic bone a) The Zygomatico-facial nerve supplies the skin over the prominence of cheek The Zygomatico-temporal nerve s the skin of the temporal region _~ Page 3 3. Posterior superior alveolar nerve > It arises from the maxillary nerve in the Pterygopalatine fos just before it enters the infraorbital fissure It supplies the pulp and investing structures and the t mucoperiosteum of the upper molars except the M.B. Toot of, » The Posterior superior alveolar nerve enters small f¢ the posterior surface of the maxilla to run in the posteric alveolar canal located in the posterior and lateral maxillary sinus The Posterior and middle and anterior alveolar ne together to form the “ Superior dental (; which dental branches enter the roots of up| branches enter the bone, periodontal ligar » Once the maxillary nerve ente pass below the orbital cavity. te continues forwards in the infra-ort the infraorbital nerve Pb In the middle of the canal, alveolar nerve ~ B.N.| 2018 > Just before its exit from the infra-orbital foramen and still in the infra-orbital canal, it gives off the anterior superior alveolar nerve P As it leaves the infra-orbital foramen it gives off the terminal branches. 1. Middle superior alveolar nerye > It runs downwards and forwards in a canal in the lateral wall of the maxillary sinus > Supplies: the pulp and investing structures and the buccal mucoperiosteum of the maxillary premolars & mesiobuccal root of the first molar 2. Anterior superior alveolar nerve > It runs in a canal in the anterior wall of the maxillary sinus ® Supplies: the pulp and investing structures and the buccal mucoperiosteum of anterior teeth V. Terminal branches of the maxillary nerve 1. The inferior palpebral nerve Supplies the skin of the lower eyelid 2. The lateral nasal nerve Supplies the lateral aspect of the nose 3. The superior labial nerve ‘Supplies the skin of the upper lip

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