Flashcards · tap card to flip

tap to reveal answer
Answer

Mind Map · scroll sideways if needed

Mandibular Nerve (CN V3) Mixed nerve ORIGIN Trigeminal ganglion TYPE Motor + Sensory + Autonomic PATHWAY Trigeminal ganglion → Foramen ovale MENINGEAL BRANCH = Nervus spinosus re-enters via foramen spinosum NERVE TO MED. PTERYGOID → Tensor tympani → Tensor veli palatini ANTERIOR DIV. mostly motor Buccal nerve cheek · sensory Masseteric masseter · TMJ Deep temporal temporalis N. to lateral pterygoid POSTERIOR DIV. mostly sensory Auriculotemporal parotid · ear · temple Lingual ant. ⅔ tongue Inferior alveolar mandibular canal N. to mylohyoid + ant. digastric Mental nerve lower lip Root Division Direct branch Terminal branch

Diagram Quiz · identify the labelled structures

CN V3 labelled diagram
0 / 20
Q1

Quick Reference

Overview
Type
MotorSensoryAutonomic
Origin
Trigeminal ganglion of Gasser (sensory) + Motor nucleus of CN V (motor)
Exit skull
Foramen ovale → infratemporal fossa
Divisions
Anterior (smaller, mostly motor) · Posterior (larger, mostly sensory)
Sensory area
Lower ⅓ face, lower lip, mandible, preauricular/temporal skin, anterior ⅔ tongue, cheek, dura of middle cranial fossa
Motor muscles
Masticatory muscles, mylohyoid, anterior belly of digastric, tensor tympani, tensor veli palatini
Direct branches (pre-bifurcation)
Meningeal branch
= Nervus spinosus · re-enters skull via foramen spinosum · innervates dura mater of middle cranial fossa (follows middle meningeal artery)
N. to med. pterygoid
Innervates medial pterygoid, tensor tympani, tensor veli palatini
Anterior division
Buccal nerve
Sensory Skin of cheek + buccal mucosa · anastomoses with CN VII buccal branches
Masseteric nerve
Motor Masseter + TMJ branch
Deep temporal nn.
Motor Anterior + posterior branches → temporalis muscle
N. to lat. pterygoid
Motor Lateral pterygoid muscle
Posterior division
Auriculotemporal n.
Two roots encircle middle meningeal artery · parasympathetic from CN IX via otic ganglion to parotid · supplies tragus, EAM, tympanic membrane, temporal skin
Lingual nerve
Sensory Joins chorda tympani (CN VII) · anterior ⅔ tongue, floor of mouth, mandibular gingiva
Inferior alveolar n.
Enters mandibular foramen → mandibular canal → terminal branch = mental nerve (lower lip via mental foramen) · gives off N. to mylohyoid + ant. belly of digastric
Key associations to memorise
Nervus spinosus
= meningeal branch · spinosum = foramen it re-enters
Otic ganglion
Relay for parasympathetic fibers (CN IX → parotid gland via auriculotemporal)
Chorda tympani
CN VII branch that joins lingual nerve · carries taste + parasympathetic to submandibular/sublingual glands
Mental nerve
Terminal branch of inferior alveolar → exits mental foramen → lower lip
1st pharyngeal arch
All muscles motor-innervated by CN V3 derive from it