The trigeminal nerve Flashcards

1
Q

What are the two umbrella classifications of nerve fibres?

A
  • Sensory
  • Motor
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2
Q

What are the two types of motor fibre transmission?

A
  • to involuntary muscles (heart)
  • to voluntary muscles (mastication)
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3
Q

What is cranial nerve V?

A

The trigeminal nerve

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4
Q

what is the largest and most important cranial nerve?

A

The trigeminal nerve

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5
Q

What types of fibres does the trigeminal nerve have?

A

Both sensory and motor

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6
Q

What is the principal general sensory nerve for the head?

A

The trigeminal nerve

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7
Q

What are the three divisions of the trigeminal nerve?

A
  • Ophthalmic
  • Maxillary
  • Mandibular
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8
Q

What is the smallest division of the trigeminal nerve?

A

The ophthalmic nerve

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9
Q

Describe the opthalmic nerve.

A
  • mostly sensory
  • leaves trigeminal ganglion and enters orbit through the superior orbital fissure
  • has three additional divisions (frontal, lacrimal, nasociliary)
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10
Q

What is the second division of the trigeminal nerve?

A

The maxillary nerve

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11
Q

What does the maxillary nerve supply?

A
  • Mostly sensory
  • maxilla & skin, maxillary sinuses, nasal cavity, palate, nasopharynx, dura mater
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12
Q

Where does the maxillary nerve exit the skull?

A

The foramen rotundum in the sphenoid bone

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13
Q

What joins up with the maxillary nerve as it enters the trigeminal ganglion?

A

The meningeal branches from the dura mater

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14
Q

What are the five sub-branches of the maxillary nerve?

A
  • zygomatic nerve (primarily sensory)
  • infraorbital nerve (sensory)
  • nasopalatine nerve (sensory)
  • greater palatine (sensory)
  • lesser palatine (sensory)
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15
Q

What does the nasopalatine nerve supply?

A
  • anterior hard palate
  • maxillary anterior teeth
  • tissues of the nasal septum
    (all sensory)
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16
Q

Describe the greater palatine nerve.

A
  • Sensory nerve for
  • posterior hard palate
  • posterior lingual gingiva
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17
Q

Describe the lesser palatine nerve.

A
  • Sensory nerve for
  • soft palate and palatine tonsils
18
Q

What are the dental branches of the maxillary nerve?

A
  • Anterior superior alveolar
  • Middle superior alveolar
  • Posterior superior alveolar
19
Q

What does the ASA nerve supply?

A
  • maxillary anterior teeth
  • facial gingiva
20
Q

What does the MSA nerve supply?

A
  • upper premolars
  • Mesiobuccal root of upper 1st molar (important)
  • sinus mucosa
  • buccal gingiva
21
Q

What does the PSA supply?

A
  • upper molars (2nd and 3rd)
  • maxillary sinuses
22
Q

What is the largest division of the trigeminal nerve?

A

The mandibular nerve

23
Q

What is the mandibular nerve composed of?

A
  • Large sensory root
  • Small motor root
24
Q

What is the anterior trunk of the mandibular nerve composed of?

A
  • Long buccal nerve
  • Muscular branches
25
What is the posterior trunk of the mandibular nerve composed of?
- Auriculotemporal nerve - Inferior alveolar nerve - Lingual nerve (P-AIL)
26
Describe the buccal (mandibular) nerve | and where is it located
Sensory - Supplies buccal mucosa, skin of cheek, buccal gingiva - located on buccinator but doesnt innervate
27
What are the muscular branches of the mandibular nerve?
All motor: - Masseteric nerve - Lateral pterygoid nerve - Deep temporal nerve mld (me lady)
28
Describe the auriculotemporal (mandibular) nerve | and fibres it carries
Sensory nerve for external ear, skin of scalp, tmj - Carries postganglionic parasympathetic fibres to the parotid gland
29
Describe the lingual nerve
Sensory nerve for general sensation of body of tongue (ant. 2/3), floor of mouth, lingual gingiva.
30
Describe the mylohyoid (mandibular) nerve.
Motor nerve - to mylohyoid muscle and anterior belly of the digastric muscle
31
Describe the mental (mandibular) nerve. | innervation, path
Sensory nerve for the chin, lower lip, labial mucosa of anterior teeth. Enters through mental foramen.
32
Describe the incisive (mandibular) nerve.
Sensory nerve for mandibular premolars and anterior teeth.
33
What does the incisive nerve merge with? | and where?
The mental nerve to form the IA in the mandibular canal
34
Describe the inferior alveolar nerve. | innervation, what forms it
Sensory nerve for mandibular molars - Formed by mental and incisive nerves
35
What is a trigeminal nerve disorder?
Trigeminal neuralgia
36
What is trigeminal neuralgia?
Nerve pain due to compression or inflammation or degeneration of the trigeminal nerve
37
Where does trigeminal neuralgia occur?
The right side of the head, affects CV2 and 3 more than CV1
38
What are treatments of trigeminal neuralgia? (6)
- Anticonvulsants (carbamazepine) - Botox - Laser surgery - Surgical neurectomy - Radiation therapy - Alcohol injections
39
What does the deep temporal branch of the mandibular nerve innervate? | and what does it pass through
The temporalis muscle passes through the sphenoid bone
40
What does the masseteric branch of the mandibular nerve innervate? | and what does it pass through
The masseter muscle passes through the mandibular notch
41
What does the lateral pterygoid branch of the mandibular nerve innervate?
Both heads of the lateral pterygoid muscle.
42