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MINI-REVIEW: SENSORY INNERVATION OF HEAD: TOUCH, PAIN, TEMPERATURE, TASTE 1 - Sensory ganglia (no synapses only cell bodies) - V has Trigeminal (Semilunar ganglion); VII has Geniculate ganglion; (Note: exception not mentioned in video: Mesencephalic nucleus of V has sensory cell bodies located in CNS). 2- Sensory Innervation of Skin AREA Skin of Face, Forehead: V (Trigeminal) DETAILS face and forehead above lateral margin of eye CLINICAL Test: Two point discrimination and touch to forehead Skin of Outer Ear NERVE V1 Ophthalmic (Superior Orbital Fissure) V2 Maxillary (Foramen Rotundum) V3 Mandibular (Foramen Ovale) V,VII,IX,X between lateral margin of eye and lateral margin of mouth lateral margin of mouth to edge of mandible External auditory meatus Back of Head and Neck Cervical Spinal Nerves Cervical plexus (C2-C4) anterior and lateral; dorsal primary rami posterior side Test: Two point discrimination and touch to skin of cheek below eye Test: Two point discrimination and touch to lower lip and jaw Ear ache in Bell's palsy from VII sensory Anesthesia, pain with cervical nerve damage 3- Reflexes to Touch - Cornea is precise touch V; Pharynx is visceral, imprecise IX REFLEX ELICIT BY Corneal Reflex Touch cornea of eye (outer surface) Gag Reflex Touch oropharynx or soft palate SENSORY NERVE (IN) V1 Ophthalmic IX MOTOR NERVE (OUT) CLINICAL/RESPONSE VII - to Orbicularis oculi muscle (facial expression) X - to Pharyngeal Constrictor muscles, muscles of palate Close eyelids; response is bilateral Gagging; rapid contraction of muscles of pharynx 4- Sensory Innervation of Tongue - Touch, Pain, Temperature vs Taste Area of Tongue TOUCH, PAIN, TEMPERATURE NERVE FOR TOUCH PAIN, TEMPERATURE NERVE FOR TASTE Anterior 2/3 of tongue (Oral part of tongue) Precise localization (GSA) Trigeminal V3 Lingual Nerve Facial VII Chorda tympani Posterior 1/3 of tongue (Pharyngeal part of tongue) Imprecise localization (GVA) Glossopharyngeal IX Lingual branches Glossophary ngeal IX Lingual branches Area Anterior to Epiglottis (Pharyngeal part of tongue) Imprecise localization Vagus X Vagus X (GVA)