Head: Mandibular Nerve

Question 1

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origin of Mandibular Nerve

Answer 1

• Large sensory root (trigemnal ganglion)
• Small motor (trigemnal nerve from pons)

Question 2

Course of Mandibular Nerve

Answer 2

2 roots descend into** foramen ovale** and unite just below the foramen into Mandibular Nerve trunk, the trunk then divides into anterior and posterior division

Question 3

Branches of trunk of Mandibular Nerve

Answer 3

Motor: Nerve to medial pterygoid, which supplies:
* Medial pterygoid
* (2 tensors) Tensor palati
* tensor tympani

Sensory
* Nervous spinosus: ascends upwards through foramen spinosum to supply dura mater of posterior cranial fossa

Question 4

Branches of Anterior division of Mandibular Nerve

Answer 4

Motor (rest of muscles of mastication):
* Temporalis
* Masseter
* Lateral pterygoid

Sensory:
* Buccal Nerve: skin covering mucosa of buccinator muscle

Question 5

Enumerate branches of Posterior division of Mandibular Nerve

Answer 5

• Auriculotemporal N
• Inferior Alveolar N
• Lingual N

Question 6

Course of Auriculotemporal Nerve

Answer 6

1. orignates from post. div. of mand. N by 2 roots, around middle meningeal A
2. It Ascends behind TMJ within the parotid gland
3. it exits through upper part of parotid gland to reach the scalp

Question 7

Branches of Auriculotempral N

Answer 7

• Parotid: parotid gland
• Articular: TMJ
  Sensory:
• posterior 2/3 of lateral part of Auricle
• Ear drum
• External Auditory meatus

Question 8

Course of Inferior Alveolar Nerve

Answer 8

1. it runs on medial pterygoid muscle, posterior to lingual N
2. It enters Mandibular foramen and runs through mandibular canal
3. It terminates at mental foramen, by dividing into Mental N and Incisive N

Question 9

Branches of Inferior Alveolar Nerve

Answer 9

• Nerve to mylohyoid: Mylohyoid and Anterior belly of digastric
• Insicive Nerve: to incisors and Canines
• Mental Nerve: skin of chin and upper lip
• Dental branches: in Mandibular Canal

Question 10

Course of Lingual Nerve

Answer 10

1. Deep to ramus of Mandible: it runs on Medial pterygoid muscle in front of Inferior Alveolar Nerve
2. Deep to Body of mandible: passes in a faint groove **below last molar tooth **
3. At side of tongue: It crosses styloglossus and upper part of hypoglossus, hooks around Submandibular Duct & gives 2 ganglionic branches to Submandibular ganglion

Question 11

Branches of Lingual Nerve

Answer 11

• Taste to Anterior 2/3 of tongue (through Corda tympani)
• General sensation to Anterior 2/3 of tongue, gums, floor of mouth
• Parasympathetic to Submandibular and sublingual Glands (through chorda tympani)