cranial nerve 5

Question 1

what is the name of cranial nerve 5 and what does it supply

Answer 1

• trigeminal nerve

- skin of face and underlying structures

Question 2

how many branches, names and motor or sensory

Answer 2

• ophthalmic - sensory
• maxillary - sensory
• mandibular - sensory and motor muscles of mastication

Question 3

where does the ophthalmic branch leave and what innervation does it supply

Answer 3

• leaves cranium through superior orbital fissure

- supplies sensory info to eye and upper part of nasal cavity

Question 4

what are the 3 major branches of ophthalmic

Answer 4

• frontal [skin of forehead]
• lacrimal [lateral skin of upper eyelid and blinking]
• nasociliary [medial upper eyelid, upper part of nasal cavity]

Question 5

where does maxillary branch leave cranium and where does it provide sensory innervation to

Answer 5

• leaves cranium via foramen rotundum

- sensory innervation to skin from lower eyelid to upper lip, maxillary teeth, palate

Question 6

where does mandible branch leave cranium and where does it provide sensory and motor innervation to

Answer 6

• leave cranium through jugular foramen
• sensory innervation to skin of lower lip and chin , lower teeth, anterior 2/3 of tongue and floor of mouth
• motor innervation to muscles of mastication

Question 7

what is the clinical test for function

Answer 7

• sharp-blunt test over all divisions - see if patient recognises sharp and blunt
• for motor ask patient to clench teeth ; ask patient to protrude jaw and if there is nerve damage it will deviate to injured nerve