CRANIAL NERVES

Question 1

Cranial nerve I name, function, type of neurone

Answer 1

Olfactory nerve - sensory

• Sense of smell
• distinguishing smells
• Supplies nasal mucosa

Question 2

Cranial nerve II name, function, type of neurone

Answer 2

Optic - sensory

Supplies the brain with visual information from the eyes

Question 3

Cranial nerve III name, function, type of neurone

Answer 3

Oculomotor - motor

Allows for adduction, depression and elevation in the eyes and pupil constriction which is from parasympathetic innervation

Question 4

Cranial nerve IV name, function, type of neurone

Answer 4

Trochlear - motor

Enables movement in the superior oblique of the eye and allows the eye to move down and out

Question 5

Cranial nerve V name, function (3) , type of neurone

Answer 5

Trigeminal - both

Ophthalmic - sends sensory info such as pain, temp, and proprioception from the upper face, skull and eye

Maxillary - sensation to the middle region of the face including teeth, palate and gums

Mandibular - Helps ears to soften loud sounds and helps keep chemical balance and pressure between the ears

Question 6

Cranial nerve VI name, function, type of neurone

Answer 6

Abducens - motor

Allows eyes to move towards the side of the head away from the nose. It innervates the lateral rectus muscle which is an extra ocular muscle

Question 7

Cranial nerve VII name, function, type of neurone

Answer 7

Facial - both

Responsible for facial expressions, taste in the anterior 2/3 of the tongue and innervation of the submandibular gland

Question 8

Cranial nerve VIII name, function, type of neurone

Answer 8

Vestibulocochlear - sensory

Vestibular - info about head position and movement - keep balance and maintain posture to the brain

Cochlear - carries auditory info to the brain

Two nerves join together in the cranial nuclei to form the vestibulocochlear nerve

Question 9

Cranial nerve IX name, function, type of neurone

Answer 9

Glossopharyngeal - both

Sensory: Carries sensory and taste info from posterior 1/3 of tongue. Carries sensory info from the carotid artery and carotid sinus

Motor: motor innervation to the stylopharyngeus muscle which is responsible for the elevation of the larynx and pharynx during speaking and swallowing

Also controls the upper pharynx, tonsils, outer ear, eardrum and eustachian tube.

Question 10

Cranial nerve X name, function, type of neurone

Answer 10

Vagus - both

Sensory: Supplies the epiglottis and the laryngopharynx. Parasympathetic innervation and visceral sensation of the thorax and abdomen

Motor: pharynx, larynx and one tongue muscle

Question 11

Cranial nerve XI name, function, type of neurone

Answer 11

Accessory - motor

Question 12

Cranial nerve XII name, function, type of neurone

Answer 12

Hypoglossal - motor