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BDS2 ANATOMY > Trigeminal Nerve 2 > Flashcards

Trigeminal Nerve 2 Flashcards

1
Q

what is the course of the Mandibular Division of CNV?

A

CNV3 passes through the foramen ovale & into the infratemporal fossa

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2
Q

where is the foramen ovale located?

A

base of the greater wing of the sphenoid

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3
Q

what is the lateral boundary of the infratemporal fossa?

A

ramus of the mandible

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4
Q

what boundary lies medially to the infratemporal fossa?

A

lateral pterygoid plate of sphenoid bone

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5
Q

what is the anterior boundary of the infratemporal fossa?

A

posterior aspect of the maxilla

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6
Q

what boundaries lie posteriorly to the infratemporal fossa?

A
  • tympanic plate
  • mastoid process
  • styloid process
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7
Q

what is the superior boundary of the infratemporal fossa?

A

infratemporal crest of sphenoid bone

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8
Q

what is the inferior boundary of the infratemporal fossa?

A

angle of the mandible

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9
Q

what is interesting about the mandibular division of the trigeminal nerve, differing it from the other divisions?

A

it has 3 trunks

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10
Q

what are the main branches of the mandibular division of the trigeminal nerve?

A
  • auriculotemporal
  • buccal
  • mental
  • lingual
  • muscular
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11
Q

what are the different trunks of the mandibular division known as?

A
  • main trunk
  • anterior trunk
  • posterior trunk
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12
Q

what nerves come from the Main Trunk of the Mandibular Division of CNV? note if they are motor or sensory:

A
  • meningeal branch (sensory)
  • branch to tensor tympani (motor)
  • branch to tensor veli palatini (motor)
  • nerve to medial pterygoid (motor)
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13
Q

where does the sensory meningeal nerve innervate?

A

dura mater

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14
Q

what nerves arise from the Anterior Trunk of the Mandibular Division of CNV? are they motor or sensory?

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

what nerves arise from the Posterior Trunk of the Mandibular Division of CNV? are they motor or sensory?

A
  • auriculotemporal nerve (sensory)
  • lingual nerve (sensory)
  • inferior alveolar nerve (MIXED motor & sensory)
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16
Q

what are the areas of distribution of the mandibular division?

A
  • auricle
  • temple
  • cheek (posteriorly or laterally)
  • lower lip
  • chin
  • floor of mouth & lower teeth
  • anterior 2/3 tongue
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17
Q

where does the auriculotemporal nerve innervate? what type of innervation does this nerve supply?

A

sensory innervation to posterior temple/side of head

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18
Q

where does the buccal nerve innervate? what type of innervation does this nerve supply?

A

sensory innervation to the lateral posterior area of the cheek & posterior buccal gingivae of molars

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19
Q

where does the mental nerve innervate? what type of innervation does this nerve supply?

A

sensory innervation to the lower lip & buccal gingivae of anterior teeth (premolar onwards)

20
Q

what nerve does the mental nerve arise from?

A

a branch of the inferior alveolar nerve (posterior trunk)

21
Q

where does the mental nerve emerge?

A

the mental foramen

22
Q

what disorder may cause terrible pain to arise in CNV3? (occasionally in CNV2 as well)

A

trigeminal neuralgia

23
Q

what Trunk of the Mandibular Division supplies general sensory innervation to the oral cavity?

A

posterior trunk

24
Q

what nerve supplies sensory innervation to the cheek & posterior buccal gums?

A

buccal nerve

25
Q

what nerve supplies the lower posterior teeth? (from molars up to second premolar)

A

main trunk of inferior alveolar nerve

26
Q

what nerve supplies the lower anterior teeth? (1st premolar to central incisor)

A

incisive branch of inferior alveolar nerve

27
Q

what nerve supplies the skin of chin & lower lip, as well as anterior buccal gingivae?

A

mental nerve branch of the inferior alveolar nerve

28
Q

what is interesting about the inferior alveolar nerves innervation?

A

before entering the mandibular foramen, the inferior alveolar nerve fibres are MIXED (both sensory and motor)

29
Q

what occurs before the mixed inferior alveolar nerve enters the mandibular foramen?

A

a branch splits off, this is the nerve to mylohyoid (MOTOR FIBRES)

30
Q

when the inferior alveolar nerve enters the mandibular division, how does its innervation change?

A

only SENSORY innervation once it enters the spongy bone (through mandibular foramen)

31
Q

what does the nerve to mylohyoid supply?

A

motor innervation to the mylohyoid & anterior belly of digastric

32
Q

what nerve supplies the lingual gingivae?

A

lingual nerve

33
Q

what is meant by general sensation?

A
  • pressure
  • temperature
  • pain
    etc.
34
Q

what is meant by special sensation in relation to oral cavity?

A

taste

35
Q

what does the lingual nerve innervate? what type of innervation is this?

A

provides general sensory sensation to the anterior 2/3rd of the tongue

36
Q

what nerve supplies special sensation to the anterior 2/3rds of tongue?

A

CNVII (7) facial nerve

37
Q

what nerve innervates the muscles of mastication?

A

CNV3 motor roots

38
Q

what are the different muscles of mastication?

A
  • lateral pterygoid muscle
  • medial pterygoid muscle
  • masseter muscle
  • temporalis muscle
39
Q

what other muscles (aside from muscles of mastication) does CNV3 supply?

A
  • tensor tympani (middle ear)
  • tensor palati
  • mylohyoid
  • anterior belly of digastric
40
Q

what is the jaw jerk reflex?

A
  • involves sensory information being passed through the trigeminal nerve into the mesencephalic nucleus (of the trigeminal nerve) which deals with proprioception
  • it then connects to the motor nucleus of the trigeminal of the pons
  • info sent to muscles
41
Q

what is the skin over the angle of the mandible supplied by?

A

the cervical plexus of the great auricular nerve (cranial nerve 2 & 3)

42
Q

what is shingles?

A

reactivation of varicella zoster virus in the trigeminal ganglion

43
Q

what are the clinical symptoms of shingles/

A
  • erythematous, vesticular, crusting rash

- burning sensation

44
Q

what is Hutchinson’s sign?

A

cutaneous involvement of the tip of the nose (external nasal branch of nasociliary nerve)

45
Q

what does a positive Hutchinson’s sign increase the chance of?

A

the likelihood of ocular complications

  • conjunctivitis
  • keratitis (cornea)
  • uveitis
46
Q

what does the facial nerve supply?

A

the muscles of facial expression

BDS2 ANATOMY (3 decks)

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