Head and Neck Temporal and Infratemporal regions part II (Mandibular Nerve and Otic Ganglion)

Dr. Mohamed El fiky

Professor of anatomy and embryology

Trigeminal Nerve

Mandibular Division

The Mandibular Nerve Origin :It is a branch of trigeminal nerve

Exit from the Skull: It comes out from the skull through foramen ovale

Tensor Palati

Large Sensory Root Small Motor Root

Lateral Pterygoid

Middle Meningeal Artery

Anterior Division Posterior Division

Roots: The mandibular nerve has 2 roots motor root and sensory root

Course and Relations : • The mandibular nerve run for a short course in the cranial cavity then it comes out from the the skull through foramen ovale . • In the infratemporal fossa the nerve trunk is deep to the lateral ptregoid muscle and it divided into 2 division , anterior division and posterior division

The Mandibular Nerve

Anterior Division Posterior Division

V1 V2

1- Nerve to Medial pterygoid

Nerve to Tensor palati

Motor root Mandibular nerve (V3 (Medial Veiw)

Nerve to Tensor tympani

2- Nervous spinosus

Medial Pterygoid Muscle

Lateral Pterygoid Muscle

Otic Ganglion

Branches of The Mandibular Nerve A- Branches from the Trunk

1-Nerve to Lateral Pterygoid

2- Deep temporal nerves 3- Masseteric nerve

4- Buccal nerve

B- Branches from the Anterior Division

1- Auriculotemporal nerve

2- Inferior Alveolar nerve

3- Lingual nerve

C- Branches from the Posterior Division 1- Auriclotemporal 2- inferior alveolar 3- Lingual nerve .

Auriculotemporal Nerve Middle meningeal Artery

Sphenomandibular Ligament

Capsule of TMJ

1- Auriculotemporal NerveOrigin, Course and Relations

Auriculotemporal nerve

Parotid Gland

1- Auriculotemporal NerveOrigin, Course and Relations

Upper 2/3rd of Outer Surface of External Ear

External auditory meatus

Outer layer of Tympanic membrane

Fibers inside Auriculotemporal Nerve 1- Sensory Fibers

Auriculotemporal nerve

Inferior Salivatory Nucleus

Inferior Ganglion of Glossopharyngeal Nerve

Glossopharyngeal Nerve

Nerve of Jacopson

Tympanic Plexus Lesser Superficial Petrosal

Otic Ganglion

Fibers inside Auriculotemporal Nerve

2- Autonomic Fibers

Inferior alveolar nerve

Sphenomandibular ligament

Lingual nerve

Medial Pterygoid Muscle

Lateral Pterygoid Muscle

Nerve to Myelohyoid

Inferior alveolar Vessels

2- Inferior Alveolar Nerve :Origin, Course and Relations

Inferior alveolar nerve

Nerve to Myelohyoid Incisive branch

Mental nerve

Branch to molar and Premolar teeth

Inferior alveolar nerve Inside the mandibular canal

Distribution of Inferior Alveolar Nerve

Mylohyoid nerve

The Mylohyoid Nerve

Nerve to Mylohyoid

Nerve to anterior belly of digastric muscled

The Mylohyoid Nerve

Chorda Tympani

Inferior Alveolar nerve Lingual nerve

3- Lingual Nerve

Course : The lingual nerve arise from the posterior division it is deep to lateral pterygoid and it joined with the chorda tympani nerve . The lingual nerve pass between the styloglosus muscle and root of the last molar . The lingual nerve pass on the hyoglosus muscle . The lingual nerve hook around the submandibular salivary duct then it inter the tongue to supply the anterior 2/3 of the tongue

Medial Pterygoid Muscle

Lingual nerve

Lateral Pterygoid Muscle

Styloglossus Muscle

Last molar tooth

Superior Constrictor of Pharynx

Anterior 2/3rd of tongue

Floor of mouth

Inside of gums

Parynchma of Sublingual and Submandibular glands

Distribution of Lingual Nerve 1- Sensory Fibers of Lingual Nerve

Autonomic fibers to Sublingual and Submandibular glands

2- Autonomic fibers

Distribution of Lingual Nerve

Tensor Veli Palati

1- Sensory Root from Auriculo-temporal Nerve

2- Sympathetic Root from Sympathetic Plexus around Middle Meningeal Artery

3- Parasympathetic Root from Lesser Petrosal Nerve

Otic Ganglion Site :Infra temporal fossa deep to lateral ptregoid muscle below foramen ovale

Roots : 1- sympathetic root : sympathetic plexus around middle meningeal artery 2- sensory root : from aurcilo-temporal nerve . 3- parasympathetic root : lesser petrosal nerve .

Inferior Salivatory Nucleus

Inferior Ganglion of Glossopharyngeal Nerve

Glossopharyngeal Nerve

Nerve of Jacopson

Tympanic Plexus Lesser Superficial Petrosal

Otic Ganglion