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BDS2 BAMS - Anatomy > Trigeminal nerve 2 (CNV3) > Flashcards

Trigeminal nerve 2 (CNV3) Flashcards

1
Q

Out of CNV1,2 and 3 what is the most important for us

A

CNV3 (mandibular)

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2
Q

what does sensory info does CNV3 provide

A

temple, jaw, chin, anterior 2/3 tongue, floor of mouth along with lower teeth and gums, lower lip

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3
Q

what motor info does CNV3 provide

A

muscles of mastication + a couple of others

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4
Q

What is the course of CNV3

A

passess through the foramen ovale and into the infratemporal fossa where it gives several branches

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5
Q

after the trigeminal ganglion where do each of the 3 branches go

A

CNV1 - superior orbital fissure
CNV2 - foramen rotundum
CNV3 - foramen ovale

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6
Q

CNV3 exits into less protected structure than CNV1 and 2, advantage and disadvantage of this? (infratemporal fossa no bone)

A

advantage - can target easier

disadvantage - branches are vulnerable to injury

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7
Q

Boundaries of the infratemporal fossa

A
  • not continuous
  • not all connected
    i. e. if you have a dislocation, branches of CNV3 can be affected

laterally: ramus of mandible
medially: lateral pterygoid plate of sphenoid bone
anteriorly: posterior aspect of maxilla
superiorly: infratemporal crest of sphenoid bone
inferiorly: angle of mandible

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8
Q

What are the main branches of the mandibular division

A
  • Auriculotemporal
  • Buccal
  • Mental
  • lingual
  • muscular
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9
Q

What info does the mandibular branch carry

A

Parasympathetics via submandibular and otic ganglia to submandibular and sublingual glands and parotid gland

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10
Q

Before CNV3 divides into anterior and posterior branches, what other small branches are there? are these sensory or motor?

A
  1. Meningeal branch (sensory)
  2. Branch to tensor tympani (motor)
  3. Branch to tensor veli palatini (motor)
  4. Nerve to medial pterygoid (motor)
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11
Q

What does the meningeal branch do

A

sensory to dura mater

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12
Q

What does the branch to tensor tympani do

A
  • In middle ear, 3 little bones to help vibrations, 2 muscles attach to these, control vibration of ear walls
    (If someone presents to injury of CNV3, very sensitive to loud noises + sensory problems in temple, jaw, chin, inability to close jaw)
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13
Q

What does the branch to tensor veli palatini do

A

elevation of soft palate

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14
Q

What are the branches of the anterior trunk of the mandibular division? are they sensory or motor?

A
  • deep temporal nerves (motor)
  • nerve to lateral pterygoid (motor)
  • buccal nerve (sensory)
  • anterior trunk (motor)
  • masseteric nerve (motor)
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15
Q

How is the buccal branch CNV3 different to the buccal branch of CNVII

A

CNV3 - infratemporal fossa, behind mandible, sensory

CNVII - facial nerve, superficial, motor

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16
Q

What are the posterior branches of CNV3? are they sensory or motor?

A
  • auriculotemporal (sensory)
  • lingual (sensory)
  • inferior alveolar (mixed)
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17
Q

In what way is the inferior alveolar nerve sensory and motor

A

Higher up (superiorly) the inferior alveolar nerve is a mixed nerve, then divides into 2:

  • mylohyoid (motor component goes with this nerve)
  • after it loses it’s motor component, the rest of the nerve is sensory
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18
Q

What part of CNV3 supplies general sensation to the anterior 2/3rds of the tongue

A

lingual nerve

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19
Q

What is the term for terrible pain usually associated with CNV3 pain

A

trigeminal neuralgia

20
Q

What nerves provide which parts of the oral cavity general sensory supply

A
  • Buccal nerve to cheek and lateral gum
  • Inferior alveolar nerve (+incisive nerve) to lower teeth
  • Inferior alveolar nerve (mental nerve) to skin of chin and lower lip (both skin and mucous membranes)
21
Q

What is the course of the inferior alveolar nerve

A
  • supplies the mylohyoid and anterior belly of digastric
  • before entering the mandibular foramen
  • to supply general sensation to the lower teeth
22
Q

what nerve supplies the lower teeth general sensory supply

A

inferior alveolar nerve

incisive branch = 1-4, main trunk = 5-8

23
Q

what nerve supplies the buccal aspect of the gingiva next to teeth 6-8 on the lower arch

A

buccal nerve

24
Q

what nerve supplies the buccal aspect of the gingiva next to teeth 1-5 on the lower arch

A

mental nerve (from inferior alveolar

25
Q

what nerve supplies the lingual aspect of the gingiva next to teeth 1-8 on the lower arch

A

lingual nerve

26
Q

What nerve is involved in general sensation (not taste) to the anterior 2/3rds of the tongue

A

CNV3 via lingual nerve

27
Q

What nerve is involved in special sensation (taste) to the anterior 2/3rds of the tongue

A

facial nerve via chorda tympani

28
Q

what part of the tongue is the trigeminal nerve involved in

A

general sensation (pain and temp) to the anterior 2/3rds

29
Q

what part of the trigeminal nerve has the motor root for the muscles of mastication

A

CNV3

30
Q

what are the muscles of mastication

A
  • temporalis
  • masseter
  • lateral pterygoid
  • medial pterygoid
31
Q

what muscles of mastication close the mouth (elevators)

A
  • temporalis
  • masseter
  • medial pterygoid
32
Q

what does the temporalis do

A

close the mouth (elevator)

33
Q

what does the masseter do

A

close the mouth (elevate)

34
Q

what does the medial pterygoid do

A

close the mouth (elevator)

35
Q

what does the lateral pterygoid do

A

opens the mouth (depresses)

36
Q

what is the only muscle of mastication to open the mouth

A

lateral pterygoid

37
Q

apart from the muscles of mastication, what else does CNV3 supply

A
  • tensor tympani muscle in the middle ear
  • tensor palati
  • mylohyoid
  • anterior belly of digastric
38
Q

What happens during the jaw jerk reflex

A

The response to the stimulus is monosynaptic, with sensory neurons of the trigeminal mesencephalic nucleus sending axons to the trigeminal motor nucleus, which in turn innervates the masseter. This reflex is used to judge the integrity of the upper motor neurons projecting to the trigeminal motor nucleus. Both the sensory and motor aspects of this reflex are through CN V

39
Q

What nerve supplies the skin of the angle of the mandible?

A

cervical plexus with the great auricular nerve (C2 and C3)

NOT CNV!!!

40
Q

what is hutchinson’s sign

A

shingles on the tip of nose (increases likelihood of ocular complications via nasociliary nerve)

41
Q

You should always aspirate to avoid…

A
  • hitting a vein
  • hitting an artery
  • hitting a muscle
  • hitting facial nerve
42
Q

if you hit a vein with LA what’s the most likely to hit

A

pteryoid plexus

43
Q

if you hit an artery with LA what’s the most likely to hit

A

could hit lots

44
Q

if you hit a muscle with LA what’s the most likely to hit and what would happen

A
  • medial pterygoid

- trismus

45
Q

if you hit the facial nerve with LA what’s most likely to happen

A
  • unilateral palsy??
  • ipsilateral palsy??
    facial nerve palsy is v rare (will resolve after a day or 2)
46
Q

what nerve supplies all the muscle of facial expression

A

facial nerve

BDS2 BAMS - Anatomy (2 decks)

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