LA Anatomy

Question 1

where does the trigeminal nerve divide into its three main branches

Answer 1

three divisions arise from the trigeminal ganglion which is situated in the middle cranial fossa of the skull (temple area)

Question 2

how does the opthalmic division exit the middle cranial fossa and where does it travel next

Answer 2

via the superior orbital fissure and travels to the orbit

Question 3

how does the maxilliary division exit the middle cranial fossa and where does it travel next

Answer 3

via the foreamen rotundum and travels to the pterygopalatine fossa

Question 4

how does the mandibular division exit the middle cranial fossa and where does it travel next

Answer 4

via the foreamen ovale and travels to the infratemporal fossa

Question 5

for each division of the trigeminal nerve does it carry sensory or motor fibres

Answer 5

opthalmic - sensory
maxillary - sensory
mandibular - sensory and motor

Question 6

what does the opthalmic division supply

Answer 6

sensory innervation to forehead, scalp , cornea, upper eyelid

Question 7

what does the maxillary division supply

Answer 7

sensory innervation to cheeks, sides of nose, upper lip , hard and soft palates, maxillary teeth and gingiva

Question 8

what does the mandibular division supply

Answer 8

sensory innervation to lower lip , chin , mandibular teeth and tempoauricular area
motor innervation to the muscles of mastication and mylohyoid muscle

Question 9

what are the three main branches of CN V1

Answer 9

frontal , lacrial and nasocilliary

Question 10

what branch of CN V2 branches before exiting the cranium

Answer 10

meningeal nerve - supplies dura mater

Question 11

zygomatic nerve

Answer 11

branch of CN V2
supplies sensory innervation to orbit
enters orbit via inferior orbital fissure

Question 12

infraorbital nerve

Answer 12

branch of CN V2
enters orbit via inferior orbital fissure then leaves skull to exit face via infraorbital foreamen
supplies part of upper lip , lower eye and sides of nose
also gives off middle superior alveolar nerve and anterior superior alveolar nerve which supply pre molars and their gingiva and canines and incisors + gingiva respectively

Question 13

posterior superior alveolar nerve

Answer 13

branch of CN V2

supplies sensory innervation to molars and their gingiva

Question 14

nasopalatine nerve

Answer 14

branch of CN V2 pterygopalatine ganglion
exits via incisive foramen
supplies anterior hard palate

Question 15

greater palatine nerve

Answer 15

branch of CN V2 pterygopalatine ganglion

supplies posterior hard palate

Question 16

lesser palatine nerve

Answer 16

branch of CN V2 pterygopalatine ganglion

supplies soft palate and uvulva

Question 17

nasopharyngeal nerve

Answer 17

branch of CN V2 pterygopalatine ganglion

supplies nasopharynx

Question 18

anterior division of CN V3

Answer 18

mainly motor fibres
consists of….
- deep temporal nerve (supplies temporalis) motor
- nerve to lateral pterygoid (lateral pterygoid) motor
- masseteric nerve (supplies masseter) motor
- buccal nerve (sensory to cheek and mandibular molar gingiva)

Question 19

inferior alveolar nerve

Answer 19

branch of CN V3
first branch = nerve to mylohyoid , motor innervation to mylohyoid muscle and anterior belly of digastric
then enters mandible via mandibular foramen
supplies sensory innervation to lower teeth and gingiva
then exits mandible via mental foramen as mental nerve which supplies sensory innervation to chin and lower lip

Question 20

lingual nerve

Answer 20

Branch of CN V3
provides sensory innervation to anterior 2/3 of tongue , lingual gingiva and floor of the mouth
chorda tympani from CN VII travels with the lingual nerve it carries sensory afferents to receive taste from ant 2/3 of tongue and also parasympathetic fibres to the submandibular and sublingual glands

Question 21

auriculotemporal nerve

Answer 21

branch of CN V3

supplies sensory innervation to that region of face

Question 22

nerve to medial pterygoid

Answer 22

branch of CN V3

motor innervation to medial pterygoid muscle

Question 23

what nerve supplies parasympathetic innervation to the submandibular and sublingual glands

Answer 23

chorda tympani branch of facial nerve

runs alongside lingual nerve of CN V3

Question 24

where does the facial nerve exit the skull

Answer 24

stylomastoid foramen

Question 25

what are the 5 main motor branches of the facial nerve

Answer 25

temporal 
zygomatic 
buccal 
marginal mandibular 
cervical

Question 26

what gland does the facial nerve run through

Answer 26

parotid gland