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Head and Neck Anatomy > Lecture 12 Trigeminal nerve and ganglion, mandibular division of trigeminal > Flashcards

Lecture 12 Trigeminal nerve and ganglion, mandibular division of trigeminal Flashcards

1
Q

T/F - trigeminal nerve has motor and sensory roots

A

True

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2
Q

T/F - trigeminal motor root arises in pons just posteromedial to the sensory root

A

False, its anteromedial

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3
Q

T/F - motor root is more compact than sensory root

A

True

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4
Q

T/f - Motor root passes as a separate structure with the sensory root through the dura to the trigeminal cave

A

True

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5
Q

T/F - motor root passes over the trigeminal ganglion and through foramen ovale

A

False, it passes under

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6
Q

T/F - Motor root unites with sensory root either in or just below foramen ovale

A

True

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7
Q

T/F - sensory root does not connect pons and trigeminal ganglion

A

False, it does connect them

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8
Q

T/F - Sensory root consists of central processes of multipolar neurons in the trigeminal ganglion

A

False, it contains unipolar neurons

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9
Q

T/F - Trigeminal ganglion is a motor ganglion

A

False, it is sensory

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10
Q

T/F - neurons in trigeminal ganglion are multipolar

A

False, they are unipolar

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11
Q

T/F - Trigeminal ganglion have just a single axon arising from the cell body (rather than one axon and numerous dendrites).

A

True

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12
Q

T/F - the single axon arising from cell body divides adjacent to the cell body to form a central process to the CNS & a peripheral process.

A

True

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13
Q

T/F - peripheral processes bring information to the neurons of the trigeminal ganglion from structures supplied by the three divisions

A

True

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14
Q

T/F - most of sensory fibres in the three divisions of the trigeminal are peripheral processes of trigeminal neurons

A

True

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15
Q

T/F - proprioceptive axons of the muscles of mastication have their cell bodies in the trigeminal ganglion.

A

False, they are located in one of the sensory nuclei of the trigeminal in the pons

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16
Q

T/F - mandibular division of trigeminal is transmitted through foramen spinosum

A

False, its foramen ovale

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17
Q

T/F - Anterior division of mandibular of trigeminal is mostly motor apart from sensory buccal branch

A

True

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18
Q

T/F - Chorda tympani arises from facial nerve, hitch hikes on lingual nerve that is sympathetic to submandibular ganglion & submandibular & sublingual salivary glands (& extrinsic salivary glands of tongue)

A

False, chorda tympani is parasympathetic, and it’s intrinsic salivary glands.

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19
Q

T/F - chorda tympani also supplies special sensation (taste) to anterior 2/3 tongue

A

True

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20
Q

T/F - posterior division of mandibular division of trigeminal is mostly motor apart from mylohyoid nerve which is predominantly sensory

A

False, it is mostly sensory, whilst mylohyoid is motor

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21
Q

T/F - Auriculotemporal nerve is sensory plus parasympathetic hitchhikers from otic ganglion of glossopharyngeal

A

True

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22
Q

List the three mandibular nerve regions

A
  • Trunk - short segment just below foramen ovale
  • Anterior division - predominantly motor
  • posterior division - predominantly sensory
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23
Q

T/F - Medial pterygoid branch passes through foramen spinosum along with middle meningeal artery to supply meninges of middle cranial fossa & mastoid air cells

A

False, it is the meningeal branch

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24
Q

T/F - Meningeal branch arises from posterior surface of mandibular trunk

A

False, it passes through foramen spinosum

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25
Q

Name two tiny branches near the medial pterygoid branch

A
  • Tensor palati

- Tensor tympani

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26
Q

T/F - medial pterygoid nerve inserts into medial surface of medial pterygoid muscle

A

True

27
Q

Muscular branches of anterior division of mandibular nerve carry _______ fibres plus some sensory ______ fibres to some of the muscles of mastication.

A

MOTOR, PROPRIOCEPTIVE

28
Q

T/F - muscular branches of anterior division of mandibular are named according to muscles they supply - masseter, lateral pterygoid, deep temporal

A

True

29
Q

Name muscular branches of V/3 that innervate the deep surface of muscles

A
  • Masseteric nerve
  • Deep temporal nerves
  • Lateral pterygoid nerve
30
Q

Long buccal nerve is sensory to __________ muscle & to skin over buccinator, buccal mucous membrane & _________ adjacent to 2nd & 3rd molars.

A

Lateral pterygoid, buccal gingiva

31
Q

T/F - long buccal nerve passes between 2 heads of medial pterygoid, then runs medial to tendon of temporalis & coronal process to ramus

A

False, it’s two heads of lateral pterygoid

32
Q

T/F - Long buccal nerve does not supply buccinator which has its sensory supply from facial nerve

A

False, it does supply buccinator which has its motor supply from facial nerve.

33
Q

Sensory buccal nerve tranverses _______ border of ramus posterolateral to ______ (nerve block here) - then to lateral surface of _______, buccal skin & mucosa, buccal gingiva over mandibular molars

A

Anterior, 3rd molar, buccinator

34
Q

Branches of posterior division of V/3 include: (2 structures)

A
  • Auriculotemporal nerve

- inferior alveolar nerve

35
Q

T/F - Auriculotemporal nerve often arises as two roots surrounding middle meningeal artery

A

True

36
Q

T/F - auriculotemporal nerve is a cutaneous motor nerve

A

False, it is sensory

37
Q

T/F - Cervical ganglion is close to origin of auriculotemporal nerve.

A

False, it is otic ganglion

38
Q

T/F - Auriculotemporal nerve picks up parasympathetic hitchhikers from nearby otic ganglion & transmits them to parotid.

A

True

39
Q

T/F - Inferior alveolar nerve arises as a motor nerve

A

False, it arises mixed sensory and motor nerve

40
Q

T/F - Inferior alveolar nerve is initially lateral to medial pterygoid

A

False, it is medial to lateral pterygoid

41
Q

T/F - Inferior alveolar nerve passes between medial pterygoid & ramus of mandible to mandibular foramen

A

True

42
Q

T/F - Inferior alveolar nerve motor fibres leave inferior alveolar nerve in mylohyoid branch

A

True

43
Q

T/F - Site of origin of inferior alveolar nerve of mylohyoid branch is not variable and is 3mm above mandibular foramen

A

False, it is variable, ranging from 5-23mm

44
Q

T/F - Inferior alveolar nerve is accompanied by inferior alveolar artery & vein

A

True

45
Q

T/F - Inferior alveolar nerve doesn’t branch in mandible and terminates as branches: mental & incisive nerves

A

False, branches in mandible to form inferior dental plexus

46
Q

T/F - The inferior alveolar nerve closely follows the inferior alveolar artery

A

True

47
Q

T/F - Inferior alveolar nerve and artery & small accompanying veins usually does not pass into mandibular foramen

A

False, it does usually pass into mandibular foramen & then through the mandibular canal within the bone of the mandible giving off branches to bone & to each of the mandibular teeth

48
Q

T/F - At levels of the premolars (first or second), inferior alveolar nerve divides into two terminal branches - incisor branch and mental branch

A

True

49
Q

Which two terminal branches does inferior alveolar nerve divide into?

A
  • Incisor branch

- mental branch

50
Q

What does incisor branch supply?

A

Canines, incisors, surrounding bone & labial gingiva

51
Q

T/F - mental branch passes through the mental foramen and forms usually three branches: two to mucosa, and one to overlying muscles and skins to supply skin

A

True

52
Q

T/F - Mandibular foramen is about half way between anterior & posterior borders of ramus

A

True

53
Q

T/F - Inferior alveolar nerve doesn’t groove at all the roots of the third molar and may be damaged during extraction of an impacted lower third molar

A

False, it may groove

54
Q

T/F - mylohyoid nerve runs lateral to mandible in mylohyoid groove to pass between mylohyoid muscle & anterior belly of digastric (motor innervation)

A

False, it runs medial

55
Q

T/F - Mylohyoid may innervate mandibular teeth in some individuals (up to 60% of people)

A

True

56
Q

T/F - Lingual nerve arises far from inferior alveolar nerve as it is usually posteromedial to inferior alveolar nerve

A

False, it arises close, and is usually anteromedial

57
Q

T/F - Lingual nerve passes between medial pterygoid & ramus of mandible.

A

True

58
Q

T/F - Lingual nerve is joined by chorda tympani

A

True

59
Q

T/F - Chorda tympani joins lingual nerve from obtuse angle from the anterior

A

False, it joins at fairly acute angle from posterior side

60
Q

T/F - Parasympathetic hitch hikers are transferred to submandibular ganglion which then supplies submandibular & sublingual glands

A

True

61
Q

T/F - Lingual nerve is superficial to mylohyoid muscle & medial to hyoglossus muscle (root of tongue)

A

False, it is deep to muscle, and is lateral to hyoglossus muscle

62
Q

T/F - Lingual nerve is inferior to submandibular gland

A

False, it is superior

63
Q

T/F - Lingual nerve passes very close to the alveoli of the second & third molars

A

True

Head and Neck Anatomy (13 decks)

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