Mandibular nerve

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Mandibular nerve :

Mandibular nerve

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Largest trigeminal division It supplies:- Teeth and gums of mandible Skin in the temporal region Part of auricle Lower lip Muscles of mastication Mucosa of the anterior 2/3 rd of the tongue Mucosa of floor of the mouth Duramater of middle cranial fossae

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Formed by union of large sensory root and small motor root. Motor fiber to muscles derived from first pharyngeal arch Exit cranial cavity, through foramen ovale Undivided trunk Anterior division Posterior division

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Undivided trunk of CN V3 Meningeal branch:{nervus spinosus} Enters foramen spinosum Divides into anterior and posterior branches Supplies duramater of middle cranial fossa and mucous lining of mastoid air cells Also contains sympathetic postganglionic fibres from the middle meningeal plexus Nerve to medial pterygoid : Enters deep aspect of the muscle supplies one or two filaments which pass through otic ganglion and supplies tensor veli palatini and tensor tympani

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Branches of anterior division of CN V3 Masseteric nerve:- passes laterally above the lateral pterygoid muscle and crosses the posterior part of mandibular coronoid notch to enter deep surafce of the masseter . Deep temporal nerves:- anterior and posterior branches pass above the lateral pterygoid to enter the deep surface of the temporalis . Nerve to lateral pterygoid muscle:- Buccal nerve:- supplies buccal mucous membrane and buccal gingiva .

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Branches of posterior division of CN V3 Lingual nerve supply floor of mouth, lingual gingiva , ant 2/3 tongue & chordae tympani taste (ant.2/3 of tongue) sub mandibular ganglion Inferior alveolar nerve mylohyoid branch inferior dental branch incisive branch mental branch Auriculotemporal nerve parotid branch articular branch auricular branch superficial temporal branch

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Auriculotemporal nerve:- it has two roots encircling the middle meningeal artery which passs between the sphenomandibular ligament and neck of mandible. auricular :- supplies skin of the tragus external acoustic meatus articular :- one or two filaments enter the posterior part of tmj to supply the joint. parotid:- convey secretomotor fibres to the gland . superficial temporal:- supply the skin of the temporal region

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Lingual nerve :- seprating from the inferior alveolar nerve usually 5-10mm below the cranial base ,it lies anterior and slightly medial to inferior dental nerve. supplies the mucosa of floor of the mouth. lingual gingiva mucosa of the anterior 2/3 rd of the tongue carries postganglionic fibres from the submandibular ganglion to the sublingual and anterior lingual glands.

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Inferior alveolar nerve:- descends medial to the lateral pterygoid at its lower border, passes between the sphenomandibular ligament and mandibular ramus to enter the mandibular canal via the mandibular foramen. in the canal it runs downward and forward , generally below the apices of teeth until the first and second premolars where it divides into terminal incisive and mental branches. Incisive branch:- runs forward in the canal to give off branches to the first premolar, canine ,incisor teeth and labial gingiva.

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Mental branch:- it passes upward backward and outward to emerge from from the mandible via mental foramen between and just below the apices of premolar teeth . it immediately divides into three branches two of which pass upward and forward communicating with the terminal filaments of the mandibular branch of the facial nerve. the third branch passes through the fibres of depressor anguli oris and platysma muscles to supply the skin of lower lip and chin.

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Mylohyoid branch:- just before entering the mandibular canal the inferior alveolar nerve gives off a small mylohyoid branch which pierces the sphenomandibular ligament and enters a shallow groove on the medial surface of the mandible. it passes below the origin of mylohyoid to lie on the superficial surface of the muscle. it supplies mylohyoid and ant belly of digastric.

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Otic ganglion parasympathetic ganglion of CN IX; supply parotid gland Chorda tympani taste fiber (SVA) from ant 2/3 of tongue parasympathetic fiber (GVE) to

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