Trigeminal Nerve 2 Flashcards by Roisin Mousa

What is the course of the third division of the trigeminal nerve

it passes through the foramen ovale, into the infratemporal fossa

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What makes the foramen ovale more prone to injury

it is not protected by bone like the other two exits of the branches of CNV

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Where is the infra temporal fossa located

deep to the masseter muscle and zygomatic arch (to which the masseter attaches)

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What is the infra temporal fossa closely associated with

both the pterygopalatine fossa, via the pterygomaxillary fissure and also communicates with the temporal fossa

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What is the lateral boundary of the infratemporal fossa

ramus of mandible

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What is the medial boundary of the infratemporal fossa

lateral pterygoid plate of sphenoid bone

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What is the anterior boundary of the infra temporal fossa

posterior aspect of the maxilla

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What is the posterior boundary of the infra temporal fossa

tympanic plate, mastoid and styloid process

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What is the inferior boundary of the infra temporal fossa

angle of the mandible

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What does the mandibular division provide sensorial innervation to

the lower face, hairy temple and anterior 2/3 of the tongue

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What does the mandibular division provide parasympathetic innervation to

submandibular, sublingual and parotid gland

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What does the mandibular division supply motor innervation to

muscles of mastication, tensors tympani and palati

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Is the skin over the angle of the mandible supplied by the trigeminal nerve

supplied by cervical plexus

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Where is the main trunk of the mandibular division found

BEFORE the division

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Where are the branches that come from the main trunk

meningeal branch
branch to tensor tympani
branch to tensor veli palatine
nerve to medial pterygoid

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Are the branches that come off the main trunk sensory or motor

motor except the meningeal branch

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What does the meningeal branch (main trunk) provide

sensory info the the dura mater

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What does the tensor tympani branch innervate

motor innervation to tensor tympani

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What is tensor tympani

Tensor tympani attaches to the ossicles in the middle ear and control the vibration of the bones to dampen down loud sounds

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What is the tensor veli palatini

Tensor veli palatini tenses the soft palate

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Are the anterior trunk branches motor or sensory

motor except buccal nerve

What are the branches of the anterior trunk

deep temporal nerves
nerve to lateral ptergoid
buccal nerve
masseteric nerve

What is the deep temporal nerve supplying

temporalis

What should buccal nerve not be confused with

BUCCAL BRANCH OF FACIAL CRANIAL NERVE

What is the difference with the buccal nerve and buccal branch

§ The BUCCAL NERVE is found in the INFRATEMPORAL FOSSA, BEHIND the MANDIBLE, it is DEEP The BUCCAL BRANCH of the FACIAL NERVE is SUPERFICIAL and MOTOR

Is the posterior trunk sensory or motor

sensory except from the inferior alveolar nerve that is MIXED

What are the branches of the posterior trunk

auriculotemporal inferior alveolar nerve lingual nerve

Where is the inferior alveolar nerve mixed

the superior part - before it divides

What part of the inferior alveolar is motor

□ Branch to the mylohyoid (muscle found in floor of the mouth which supports the oral cavity

What does the mandibular division provide

general sensation to the floor of the mouth along with the lower teeth & gums general sensation to the anterior 2/3rd of the tongue (general somatic afferent) via the lingual nerve The lingual nerve carries the chorda tympani nerve which is a branch of CN VII

What does the buccal nerve go to

cheek and lateral gum (ANTERIOR TRUNK)

What does the inferior alveolar nerve go to

The inferior alveolar nerve and it's branch, the incisive nerve, go to the lower teeth The inferior alveolar nerve goes to the skin of the chin and lower lip (both skin and mucous membranes) as the mental nerve

What does the motor component of inferior alveolar nerve supply

The mylohoid and anterior belly of digastric before entering the mandibular foramen to supply general sensation to the lower teeth

What does the mental nerve supply

provides the mucous membranes anteriorly

What does the lingual nerve supply regarding gingivae

palatal gingiva

What does the buccal nerve supply regarding gingivae

buccal gingivae

Wha does the main trunk of the interior alveolar nerve provide in regards to teeth

posterior

What does the incisive branch of the inferior alveolar nerve provide in regards to teeth

The incisive branch targets the anterior teeth

What provides general sensation to anterior 2/3 of tongue

mandibular division (CNV3) of trigeminal nerve is provided to the anterior 2/3 (oral part) of the tongue via the LINGUAL NERVE

What provides taste to anterior 2/3 of tongue

Taste is provided to the anterior 2/3 (oral part) of the tongue by the FACIAL NERVE NOT TRIGEMINAL (chorda tympani of the facial nerve)

What supplies posterior 1/3 of tongue

glossopharyngeal, both special and general

What supplies the motor for the tongue

hypoglossal

What does the mandibular division provide other than the muscles of mastication

Tensor tympani muscle in the middle ear Tensor palati (the latter via the branch to medial pterygoid) Mylohyoid and anterior belly of digastric (via inferior alveolar branch)

What are the afferent and efferent component of jaw jerk reflex run by

trigeminal nerve

What is jaw jerk reflex

Mandible is tapped at a downward angle just below the lips at the chin while the mouth is held slightly open - in response the masseter muscles will jerk the mandible upwards

What does the jaw jerk reflex go through

It is sent to the mesencephalic nucleus of the trigeminal nerve and then it comes out through the trigeminal motor nucleus

If you are injecting a superficial nerve then what can you hit

If you are near a superficial nerve then you can hit the pterygoid plexus which is a venous plexus of considerable size that is situated between the lateral pterygoid and temporalis muscle

What happens if you hit a muscle accidentally

trismus

What muscle is in close proximity

medial pterygoid

What happens if you accidentally infiltrate the parotid gland

If you hit the parotid gland and infiltrate then you can anaesthetise the facial nerve which will result in facial nerve palsy resulting in unilateral, droopy mouth, eyes unable to close etc as the facial nerve supplies all the muscles of facial expression