Trigeminal Nerve (V)
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1 Trigeminal Nerve (V)
2 Lecture Objectives Discuss briefly how the face is developed. Follow up the course of trigeminal nerve from its point of central connections, exit and down to its target areas. Describe briefly important cranial reflexes involving the face and trigeminal nerve.
3 Development of the Face: Premordia and derivatives Swellings surrounding stomodeum Mandibular prominences (paired) Soft tissue Bone Maxillary prominences (paired) Soft tissue Bone Secondary palate Frontonasal prominence (unpaired) Soft tissue Bone
4 Development of the Face: Premordia and derivatives Nasal placodes nasal pits Medial nasal prominences Fleshy nasal septum Intermaxillary segment Philtrum Premaxilla, jaw and gingiva associated with upper incisor teeth Primary palate = median palatine process Lateral nasal prominences Soft tissue Bone Nasolacrimal groove Labiogingival laminae
5 Development of the Palate Primary palate (median palatine process) Secondary palate lateral palatine processes Fusion secondary palate
6 Malformations: Cleft Lip and Palate Incisive fossa separates anterior and posterior parts Anterior clefts unilateral (E) or bilateral (F) Complete vs. incomplete Posterior clefts unilateral (C) or bilateral (D) Complete vs. incomplete Causes of palate clefts Failure of fusion between different prominences and processes Cleft lip (with (E H) or without cleft palate) 1/1000, 75% males Maxillary with medial nasal prominences Cleft palate (with (E H)or without (C D) cleft lip) 1/2500, ⅔ females Lateral palatine processes with each other & with nasal septum & with median palatine process Primary palate clefts (E F) Secondary palate clefts (C D) Primary and secondary palate clefts (G H)
7 Malformations: Facial clefts Oblique (orbitofacial fissure) (E) Maxillary with lateral nasal prominences Lateral (macrostomia) Mandibular with maxillary prominences Median (A) Between medial nasal prominences
8 Trigeminal Nerve (V) Mixed nerve Largest of the cranial nerves trigeminal ganglion Pons Three branches: Ophthalmic nerve (GSA) superior orbital fissure Maxillary nerve (GSA) foramen rotundum pterygopalatine fossa Mandibular nerve (GSA, SVE) foramen ovale infratemporal fossa
9 Trigeminal Nerve (V) Emerges from two roots on the ventrolateral surface of the pons The large sensory root (GSA) trigeminal ganglion in the trigeminal cave of the dura matter The small motor root (SVE) originates from the pons pass beneath the ganglion Join the mandibular branch for mastication
10 Motor nucleus of trigeminal nerve (SVE) Location pons Connections Cortex Reticular formation, red nucleus, tectum Fibers course Trigeminal Nerve Nuclei
11 Trigeminal Nerve Sensory Nuclei Main sensory nucleus (GSA) Touch & pressure Location, Extention Relation to Motor nucleus Spinal nucleus Spinal nucleus* (GSA) Pain & tempreture Location Extentions Medulla C2 Somatotopic organisation Ophthalmic most caudal Mandibular most rostral *receive GSA from other cranial nerves Mesencephalic nucleus (GSA) Proprioception Location, Extension
12 Trigeminal Nerve Sensory Nuclei 1 st order neurons Trigeminal ganglion 2 nd order neurons Trigeminal nerve sensory nuclei Central axons cross midline Form trigeminal lemniscus 3 rd order neurons VPM nucleus of thalamus Internal capsule
13 Maxillary Nerve: Branches Menengial branches Zygomatic branch inferior orbital fissure Zygomaticotemporal n. Zygomaticotemporal foramen Zygomaticofacial n. Zygomaticofacial foramen Posterior superior alveolar n. posterior superior alveolar foramen Infraorbital nerve inferior orbital fissure infraorbital groove infraorbital foramen Middle superior alveolar n. Anterior superior alveolar n.
14 Ganglionic branches (pterygopalatine nerves) Greater &lesser palatine nn. Greater & lesser palatine canals/foramens Nasal branches (posterior superior lateral, posterior superior medial, & nasopalatine nn.) sphenopalatine foramen Pharyngeal branch pharyngeal canal Maxillary Nerve: Branches
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16 Mandibular Nerve: Branches Meningeal branch foramen spinosum Nerve to medial pterygoid Anterior division Masseteric n. Deep temporal nn. Nerve to lateral pterygoid Buccal nerve
17 Mandibular Nerve: Branches Posterior division Auriculotemporal n. Relations TMJ, middle menengeal a. Lingual n. Relations submandibular duct Inferior alveolar n. mandibular foramen Mylohyoid n. (GSE) Mental n. mental foramen
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19 Ophthalmic Nerve: Branches Superior orbital fissure Frontal nerve Scalp Branches: Supraorbital & Supratochlear nn. Lacrimal nerve Lateral part of upper eyelid Carry parasympathetic fibers to lacrimal gland via zygomaticotemporal nerve
20 Ophthalmic Nerve: Branches Nasociliary nerve Branches: Comunicating branch to ciliary ganglion sensory fibers from short ciliary nn. Long ciliary nn. carry sympathetic fibers (dilator pupillae m.) Posterior ethmoidal n. (ethmoid & sphenoid sinuses) Anterior ethmoidal n. External nasal branch (tip of nose) Infratrochlear n. (medial part of upper eyelid & part of nose)
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23 Trigeminal Nerve (V): Lesion Loss of general sensation (hemianesthesia) from face and oral & nasal cavities Loss of corneal reflex (V1) (afferent limb) Paralysis of the muscles of mastication Deviation of the mandible to the weak side Paralysis of the tensor tympani muscle partial deafness to low pitched sounds Trigeminal neuralgia Test Sensory by touching face using cotton ball Motor by assisting masticatory muscles (masseter & temporalis) on clenching
24 Corneal Reflex
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