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Infratemporal Fossa
Nervous Structures
Kristine Joy LeyvaDMD1-A
I. Mandibular Nerve
- largest of the 3 divisions of CN V
- Mixed nerve- large sensory and small
motor root that unite after passing through foramen ovale to enter infratemporal fossa
Anterior Division: Masseteric
laterally superior to lateral pterygoid M.
anterior to TMJ and posterior of temporalis
mandibular notch
small branch to TMJ
Anterior Division: Anterior and Posterior Deep Temporal
superior to lateral pterygoid M.; between skull and temporalis; pass deep to muscle it innervates
Anterior Division: Medial Pterygoid
enters deep surface of muscle
Anterior Division: Buccal
anterior between 2 heads of lateral pterygoid
descends along lower part of temporalis
supply skin of buccinator
mucous membrane
gingiva along mandibular molars
Posterior Division: Auriculotemporal
arise from 2 roots
runs posteriorly, inferior to lateral pterygoid
medial aspect of neck of mandible
superiorly between auricle and condyle of mandible deep to parotid gland
ascends over zygomatic arch
divides to superficial temporal branches
Posterior Division: Lingual
inferior to lateral pterygoid and medial and anterior to I.A.N.
joins Chorda Tympani
between medial pterygoid and ramus of mandible
oral cavity
Posterior Division: Inferior Alveolar
descends with inferior alveolar artery
inferior to lateral pterygoid
between sphenomandibular ligament and ramus of mandible
mandibular foramen
INNERVATES: lower teeth and gingiva from premolars anteriorly to midline
Posterior Division: Mylohyoid
branch form I.A.N
descends in a groove on deep side of ramus
superficial surface of Mylohyoid M.
II. Maxillary Nerve: Posterior Superior Alveolar Nerve
pterygomaxillary fissure
infratemporal fossa (on posterior surface of maxilla along maxillary tuberosity)
gingival branch
enter posterior surface of maxilla
innervate maxillary sinus and molars
III. Chorda Tympani
SOURCE: branch from facial n. in tympanic cavity
preganglionic sympathertic fibers to submandibular ganglion and taste fibers to anterior 2/3 of tongue
enter tympanic cavity and lies along tympanic membrane and malleus
petrotympanic fissurejoins lingual nerve in infratemporal fossa
IV. Lesser Petrosal
SOURCE: tympanic plexus along promontory of the ear and re-forms as lesser petrosal nerve
middle ear cavity
preganglionic parasympathetic and postganglionic parasympathetic to parotid gland
groove for lesser petrosal n.
foramen ovale
infratemporal fossa joins otic
ganglion
V. Otic Ganglion
Postganglionic parasympathtic fibers
auriculotemporal branch (CN V)
parotid gland
CHARACTERISTICS OF CELL BODY: a collection of nerve cell bodies; located in infratemporal fossa; small stellate-shaped ganglion; located inferior to foramen ovale, medial V₃
Parasympathetics of Parotid Gland
I. Preganglionic Neuron
Preganglionic parasympathetic fibers
Inferior salivatory nucleus in medulla
glossopharyngeal N.
jugular foramen
Glossopharyngeal n.
tympanic branch of IX
tympanic plexus
lesser petrosal nerve
otic ganglion
NAME OF CELL BODY: inferior salivatory nucleusCHAR. OF CELL BODY: a collection of nerve cell bodies located in the medulla
II. Postganglionic Neuron
postganglionic parasympathetic fibers
otic ganglion
auriculotemporal branch (CN V)
parotid gland
NAME OF CELL BODY: otic ganglionCHAR. OF CELL BODY: a collection of nerve cell bodies; small stellate-shaped ganglion; located inferior to foramen ovale, medial V₃