Lecture 12 Trigeminal nerve and ganglion, mandibular division of trigeminal

Question 1

T/F - trigeminal nerve has motor and sensory roots

Answer 1

True

Question 2

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

Answer 2

False, its anteromedial

Question 3

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

Answer 3

True

Question 4

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

Answer 4

True

Question 5

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

Answer 5

False, it passes under

Question 6

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

Answer 6

True

Question 7

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

Answer 7

False, it does connect them

Question 8

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

Answer 8

False, it contains unipolar neurons

Question 9

T/F - Trigeminal ganglion is a motor ganglion

Answer 9

False, it is sensory

Question 10

T/F - neurons in trigeminal ganglion are multipolar

Answer 10

False, they are unipolar

Question 11

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

Answer 11

True

Question 12

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.

Answer 12

True

Question 13

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

Answer 13

True

Question 14

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

Answer 14

True

Question 15

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

Answer 15

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

Question 16

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

Answer 16

False, its foramen ovale

Question 17

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

Answer 17

True

Question 18

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)

Answer 18

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

Question 19

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

Answer 19

True

Question 20

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

Answer 20

False, it is mostly sensory, whilst mylohyoid is motor

Question 21

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

Answer 21

True

Question 22

List the three mandibular nerve regions

Answer 22

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

Question 23

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

Answer 23

False, it is the meningeal branch

Question 24

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

Answer 24

False, it passes through foramen spinosum

Question 25

Name two tiny branches near the medial pterygoid branch

Answer 25

- Tensor palati | - Tensor tympani

Question 26

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

Answer 26

True

Question 27

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

Answer 27

MOTOR, PROPRIOCEPTIVE

Question 28

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

Answer 28

True

Question 29

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

Answer 29

- Masseteric nerve - Deep temporal nerves - Lateral pterygoid nerve

Question 30

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

Answer 30

Lateral pterygoid, buccal gingiva

Question 31

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

Answer 31

False, it's two heads of lateral pterygoid

Question 32

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

Answer 32

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

Question 33

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

Answer 33

Anterior, 3rd molar, buccinator

Question 34

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

Answer 34

- Auriculotemporal nerve | - inferior alveolar nerve

Question 35

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

Answer 35

True

Question 36

T/F - auriculotemporal nerve is a cutaneous motor nerve

Answer 36

False, it is sensory

Question 37

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

Answer 37

False, it is otic ganglion

Question 38

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

Answer 38

True

Question 39

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

Answer 39

False, it arises mixed sensory and motor nerve

Question 40

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

Answer 40

False, it is medial to lateral pterygoid

Question 41

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

Answer 41

True

Question 42

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

Answer 42

True

Question 43

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

Answer 43

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

Question 44

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

Answer 44

True

Question 45

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

Answer 45

False, branches in mandible to form inferior dental plexus

Question 46

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

Answer 46

True

Question 47

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

Answer 47

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

Question 48

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

Answer 48

True

Question 49

Which two terminal branches does inferior alveolar nerve divide into?

Answer 49

- Incisor branch | - mental branch

Question 50

What does incisor branch supply?

Answer 50

Canines, incisors, surrounding bone & labial gingiva

Question 51

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

Answer 51

True

Question 52

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

Answer 52

True

Question 53

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

Answer 53

False, it may groove

Question 54

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

Answer 54

False, it runs medial

Question 55

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

Answer 55

True

Question 56

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

Answer 56

False, it arises close, and is usually anteromedial

Question 57

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

Answer 57

True

Question 58

T/F - Lingual nerve is joined by chorda tympani

Answer 58

True

Question 59

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

Answer 59

False, it joins at fairly acute angle from posterior side

Question 60

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

Answer 60

True

Question 61

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

Answer 61

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

Question 62

T/F - Lingual nerve is inferior to submandibular gland

Answer 62

False, it is superior

Question 63

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

Answer 63

True