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BDS2 BAMS Anatomy > Trigeminal Nerve 2 > Flashcards

Trigeminal Nerve 2 Flashcards

1
Q

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

A

it passes through the foramen ovale, into the infratemporal fossa

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2
Q

What makes the foramen ovale more prone to injury

A

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

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3
Q

Where is the infra temporal fossa located

A

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

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4
Q

What is the infra temporal fossa closely associated with

A

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

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5
Q

What is the lateral boundary of the infratemporal fossa

A

ramus of mandible

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6
Q

What is the medial boundary of the infratemporal fossa

A

lateral pterygoid plate of sphenoid bone

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7
Q

What is the anterior boundary of the infra temporal fossa

A

posterior aspect of the maxilla

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8
Q

What is the posterior boundary of the infra temporal fossa

A

tympanic plate, mastoid and styloid process

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9
Q

What is the inferior boundary of the infra temporal fossa

A

angle of the mandible

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10
Q

What does the mandibular division provide sensorial innervation to

A

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

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11
Q

What does the mandibular division provide parasympathetic innervation to

A

submandibular, sublingual and parotid gland

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12
Q

What does the mandibular division supply motor innervation to

A

muscles of mastication, tensors tympani and palati

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13
Q

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

A

NO

supplied by cervical plexus

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14
Q

Where is the main trunk of the mandibular division found

A

BEFORE the division

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15
Q

Where are the branches that come from the main trunk

A

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

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16
Q

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

A

motor except the meningeal branch

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17
Q

What does the meningeal branch (main trunk) provide

A

sensory info the the dura mater

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18
Q

What does the tensor tympani branch innervate

A

motor innervation to tensor tympani

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19
Q

What is tensor tympani

A

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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20
Q

What is the tensor veli palatini

A

Tensor veli palatini tenses the soft palate

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21
Q

Are the anterior trunk branches motor or sensory

A

motor except buccal nerve

22
Q

What are the branches of the anterior trunk

A

deep temporal nerves
nerve to lateral ptergoid
buccal nerve
masseteric nerve

23
Q

What is the deep temporal nerve supplying

A

temporalis

24
Q

What should buccal nerve not be confused with

A

BUCCAL BRANCH OF FACIAL CRANIAL NERVE

25
Q

What is the difference with the buccal nerve and buccal branch

A

§ 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

26
Q

Is the posterior trunk sensory or motor

A

sensory except from the inferior alveolar nerve that is MIXED

27
Q

What are the branches of the posterior trunk

A

auriculotemporal
inferior alveolar nerve
lingual nerve

28
Q

Where is the inferior alveolar nerve mixed

A

the superior part - before it divides

29
Q

What part of the inferior alveolar is motor

A

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

30
Q

What does the mandibular division provide

A

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

31
Q

What does the buccal nerve go to

A

cheek and lateral gum (ANTERIOR TRUNK)

32
Q

What does the inferior alveolar nerve go to

A

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

33
Q

What does the motor component of inferior alveolar nerve supply

A

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

34
Q

What does the mental nerve supply

A

provides the mucous membranes anteriorly

35
Q

What does the lingual nerve supply regarding gingivae

A

palatal gingiva

36
Q

What does the buccal nerve supply regarding gingivae

A

buccal gingivae

37
Q

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

A

posterior

38
Q

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

A

The incisive branch targets the anterior teeth

39
Q

What provides general sensation to anterior 2/3 of tongue

A

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

40
Q

What provides taste to anterior 2/3 of tongue

A

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)

41
Q

What supplies posterior 1/3 of tongue

A

glossopharyngeal, both special and general

42
Q

What supplies the motor for the tongue

A

hypoglossal

43
Q

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

A

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)

44
Q

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

A

trigeminal nerve

45
Q

What is jaw jerk reflex

A

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

46
Q

What does the jaw jerk reflex go through

A

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

47
Q

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

A

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

48
Q

What happens if you hit a muscle accidentally

A

trismus

49
Q

What muscle is in close proximity

A

medial pterygoid

50
Q

What happens if you accidentally infiltrate the parotid gland

A

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

BDS2 BAMS Anatomy (3 decks)

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