Cranial Nerves

Question 1

CN. I?

Answer 1

Olfactory
cribriform plate
special sensory smell
anosmia

Question 2

CN. II?

Answer 2

Optic
nerves form to join optic chiasm
special sensory vision

Question 3

CN. III?

Answer 3

Oculomotor
midbrain exits superior orbital fissure
somatic motor
visceral motor to parasympathetic to pupil
ciliary muscle for accommodation

Question 4

CN. IV?

Answer 4

Trochlear
emerges from dorsal surface of midbrain and exits via the superior orbital fissure
somatic motor extraocular muscles (Superior oblique)

Question 5

CN. VI?

Answer 5

Abducent
emerges between pons and medulla and exits via the superior orbital fissure
somatic motor extra ocular muscles (lateral rectus)

Question 6

CN. V1?

Answer 6

Trigeminal - Ophthalmic

general sensory from cornea forehead, eyelids, nose and mucosa of nasal cavity and sinuses

Question 7

CN. V2?

Answer 7

Trigeminal - Maxillary?
exits via the foramen rotundum
general sensory from face over maxilla, teeth, TMJ, mucosa of nose, maxillary sinuses and palate

Question 8

CN. V3?

Answer 8

Trigeminal - Mandibular
exits via the foramen ovale
general sensory from face over mandible, teeth, TMJ, mucosa of mouth and anterior 2/3rd of tongue

Question 9

CN. VII?

Answer 9

Facial nerve
exits via the internal acoustic meatus, facial canal and stylomastoid foramen
somatic motor muscles of facial expression, scalp, stapedius and middle ear
visceral motor parasympathetic innervation of submandibular and sublingual salivary glands and lacrimal glands
special sensory taste from anterior 2/3rd of tongue

Question 10

CN. VIII?

Answer 10

Vestibulocochlear
exits via the internal acoustic meatus and splits into the vestibular and cochlear nerves
special sensory vestibular sensation from semi-circular ducts, utricle

Question 11

CN. IX?

Answer 11

Glossopharyngeal
exits via jugular foramen
special sensory taste from posterior 3rd of tongue
general sensory cutaneous sensation from middle ear
visceral sensory sensation from carotid body and sinus
visceral motor parasympathetic innervation of parotid gland
somatic motor to stylopharyngeus which aids swallowing

Question 12

CN. X?

Answer 12

Vagus
exits via jugular foramen and then everywhere
special sensory taste from epiglottis and palate
general sensory from auricle and EAM …..

Question 13

CN. XI?

Answer 13

Accessory
exits via the jugular foramen
somatic motor striated muscle of the soft palate, pharynx and larynx and to SCM and trapezius

Question 14

CN. XII?

Answer 14

hypoglossal
exits through hypoglossal canal
somatic motor to muscles of the tongue