Trigeminal Nerve 2

Question 1

what is the course of the Mandibular Division of CNV?

Answer 1

CNV3 passes through the foramen ovale & into the infratemporal fossa

Question 2

where is the foramen ovale located?

Answer 2

base of the greater wing of the sphenoid

Question 3

what is the lateral boundary of the infratemporal fossa?

Answer 3

ramus of the mandible

Question 4

what boundary lies medially to the infratemporal fossa?

Answer 4

lateral pterygoid plate of sphenoid bone

Question 5

what is the anterior boundary of the infratemporal fossa?

Answer 5

posterior aspect of the maxilla

Question 6

what boundaries lie posteriorly to the infratemporal fossa?

Answer 6

• tympanic plate
• mastoid process
• styloid process

Question 7

what is the superior boundary of the infratemporal fossa?

Answer 7

infratemporal crest of sphenoid bone

Question 8

what is the inferior boundary of the infratemporal fossa?

Answer 8

angle of the mandible

Question 9

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

Answer 9

it has 3 trunks

Question 10

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

Answer 10

• auriculotemporal
• buccal
• mental
• lingual
• muscular

Question 11

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

Answer 11

• main trunk
• anterior trunk
• posterior trunk

Question 12

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

Answer 12

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

Question 13

where does the sensory meningeal nerve innervate?

Answer 13

dura mater

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

what are the areas of distribution of the mandibular division?

Answer 16

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

Question 17

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

Answer 17

sensory innervation to posterior temple/side of head

Question 18

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

Answer 18

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

Question 19

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

Answer 19

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

Question 20

what nerve does the mental nerve arise from?

Answer 20

a branch of the inferior alveolar nerve (posterior trunk)

Question 21

where does the mental nerve emerge?

Answer 21

the mental foramen

Question 22

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

Answer 22

trigeminal neuralgia

Question 23

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

Answer 23

posterior trunk

Question 24

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

Answer 24

buccal nerve

Question 25

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

Answer 25

main trunk of inferior alveolar nerve

Question 26

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

Answer 26

incisive branch of inferior alveolar nerve

Question 27

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

Answer 27

mental nerve branch of the inferior alveolar nerve

Question 28

what is interesting about the inferior alveolar nerves innervation?

Answer 28

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

Question 29

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

Answer 29

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

Question 30

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

Answer 30

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

Question 31

what does the nerve to mylohyoid supply?

Answer 31

motor innervation to the mylohyoid & anterior belly of digastric

Question 32

what nerve supplies the lingual gingivae?

Answer 32

lingual nerve

Question 33

what is meant by general sensation?

Answer 33

- pressure - temperature - pain etc.

Question 34

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

Answer 34

taste

Question 35

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

Answer 35

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

Question 36

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

Answer 36

CNVII (7) facial nerve

Question 37

what nerve innervates the muscles of mastication?

Answer 37

CNV3 motor roots

Question 38

what are the different muscles of mastication?

Answer 38

- lateral pterygoid muscle - medial pterygoid muscle - masseter muscle - temporalis muscle

Question 39

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

Answer 39

- tensor tympani (middle ear) - tensor palati - mylohyoid - anterior belly of digastric

Question 40

what is the jaw jerk reflex?

Answer 40

- 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

Question 41

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

Answer 41

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

Question 42

what is shingles?

Answer 42

reactivation of varicella zoster virus in the trigeminal ganglion

Question 43

what are the clinical symptoms of shingles/

Answer 43

- erythematous, vesticular, crusting rash | - burning sensation

Question 44

what is Hutchinson’s sign?

Answer 44

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

Question 45

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

Answer 45

the likelihood of ocular complications - conjunctivitis - keratitis (cornea) - uveitis

Question 46

what does the facial nerve supply?

Answer 46

the muscles of facial expression