Cranial Nerves

Question 1

CN V

Answer 1

Trigeminal Nerve

Question 2

Actions of CN V

Answer 2

Sensory
Motor- mandibular only
Parasympathetic

Question 3

Origin of CN V

Answer 3

Pons

Question 4

Branches of CN V

Answer 4

Ophthalmic, maxillary, mandibular

Question 5

What division is carries motor

Answer 5

Mandibular

Question 6

Where do the division exit the cranium

Answer 6

Ophthalmic- SOF
Maxillary- Rotundum
Mandibular- Ovale

Question 7

Ophthalmic division spread

Answer 7

Scalp to dorsum of nose and cornea

Question 8

Corneal reflex

Answer 8

Involuntary blinking

Ophthalmic nerve afferent. Facial nerve efferent causing contraction of orbicularis oculi muscle.

Question 9

Maxillary division spread

Answer 9

Conjunctiva and lower eyelid to superior palate

Question 10

Parasympathetic maxillary

Answer 10

Lacrimal glands from pterygopalatine ganglion

Question 11

Mandibular division spread

Answer 11

Mucous membranes and oral cavity floor to lower gums

Question 12

Motor supply of mandibular

Answer 12

Mastication muscles
Medial, lateral pterygoid and masseter and temporalis
Anterior belly of diagastric

Question 13

Parasympathetic of mandibular

Answer 13

Submandibular and sublingual glands and parotid gland from otic ganglion

Question 14

Inferior alveolar nerve block

Answer 14

Branch of V3 which innervates gum of lower teeth- used as local anaesthesia. Can get numbness of anterior 2/3 tongue due to spread to lingual nerve.

Question 15

Examining CN V

Answer 15

Close eyes and cotton bud face to detect sense
Clench jaw
Corneal flex