Cranial Nerves

Question 1

Olfactory CN 1:
Origin:
Function:
Exit:

Answer 1

Origin: Nasal Mucosa
Function: Sensory Smell
Exit: Cribiform plate of the ethmoid bone

Question 2

Optic CN ll:
Origin:
Function:
Exit:

Answer 2

Origin: Retina
Function: Sensory: Sight
Exit: Optic Canal

Question 3

Oculomotor CN lll:
Origin:
Function:
Exit:

Answer 3

Origin: Midbrain
Function: Somatic Motor: levator palpeerde superioris; superior, medial, and inferior rectus; inferior oblique
Visceral Motor: sphincter pupillae
Exit: Superior orbital fissure

Question 4

Trochlear CN lV:
Origin:
Function:
Exit:

Answer 4

Origin: Midbrain
Function: Somatic motor - superior oblique
Exit: superior orbital fissure

Question 5

Trigeminal CN V:
Origin:
Function:
Exit:

Answer 5

Origin: Pons
Function: General Sensory:
CNV-1: Orbit and forhead
CNV-2: maxillary region
CNV-3: mandibular region, tongue
Brachial motor:
CNV-3: Muscles of mastication (middle and lateral ptyergoid, masseter, temporalis) mylohyoid, tensor tympani (low frequency sounds), sensory veil palatine
Exit: CN-V1 - superior orbital fissure
CN-V2- Foramen Rotundum
CN-V3- Foramen Ovale

Question 6

What detects low frequency sounds?

Answer 6

tensor tympani

Question 7

What detects high frequency sounds?

Answer 7

stapedius

Question 8

Abducens CN Vl:
Origin:
Function:
Exit:

Answer 8

Origin: Pons
Function: Somatic motor: lateral rectus
Exit Internal acustic meatus

Question 9

Facial CN Vll:
Origin:
Function:
Exit:

Answer 9

Origin: Pons
Function: General Sensory - external acoustic meatus and auricle
Special Sensory- anterior two third of the tongue
Branchial Motor- muscles of facial expression, stylohyoid, posterior digastrics, stapedius
Visceral motor- lacrimal, submandibular, sublingual, and nasal glands
Exit: internal acoustic meatus

Question 10

Vestibulocochlear CN Vlll:
Origin:
Function:
Exit:

Answer 10

Origin: Inner ear
Function: Special sensory: hearing, balance, and equilibrium
Exit: Jugular Foramen

Question 11

Glossopharyngeal CN IX:
Origin:
Function:
Exit:

Answer 11

Origin: Medulla
Function:
General Sensory: posterior 1/3 of the tongue, oropharynx, tympanic membrane, middle ear, auditory tube
special sensory: taste from posterior two thirds of tongue
visceral sensory: carotid sinus (baroreceptor) and carotid body (chemoreceptor)
Brachial motor: stylopharyngess
visceral motor: parotid gland
Exit: Jugular Foramen

Question 12

Vagus CN X:
Origin:
Function:
Exit:

Answer 12

Origin: Medulla
Function:
General Sensory: skin of posterior ear and external acoustic meatus
Visceral sensory: aortic and carotid bodies and aortic arch
branchial motor: palatal muscles, pharyngeal muscles, laryngeal m
visceral motor: heart, smooth muscle, glands of the respiratory tract, GI tube, and viscera
Exit: Jugular Foramen

Question 13

Accessory CN Xl
Origin:
Function:
Exit:

Answer 13

Origin: Cervical Spinal cord
Function: Branchial Motor: trapezius and sternocleidomastoid
Exit: Jugular Foramen

Question 14

Hypoglossal CN Xll
Origin:
Function:
Exit:

Answer 14

Origin: Medulla
Function: Somatic Motor: tongue
Exit: Hypoglossal Canal

Question 15

What nerves are within the cavernous sinus?

Answer 15

Cranial Nerve 3 (Oculomotor), Trochlear, abducens