Cranial Nerves

Question 1

Organization and naming of nerves

Answer 1

Goes from most superior to most inferior, roman numerals l-Xll

Question 2

Olfactory nerve l

Answer 2

Sensory, smell,

-Lesion results in loss of smell on affected side

Question 3

Optic ll

Answer 3

Involved in vision, sensory

-Lesion: blindness on affected side, loss of pupillary light reflex

Question 4

Oculomotor lll

Answer 4

Somatic motor to four of the six muscles that move the eye
ANS: parasympathetic to sphincter papillae for pupil constriction
Lesion: eye deviation causing double vision, pupil dilation and loss of pupillary light reflex

Question 5

Trochlear lV

Answer 5

Function: somatic motor to superior oblique eye muscle
Lesion: eye deviation causing double vision

Question 6

Trigeminal V

Answer 6

Function: Has three branches, sensory, general sense from face to forehead, a lot of tongue and mouth
Motor: somatic motor muscles for chewing
Lesion: Loss of feeling in face and forehead or increased sensitivity to pain called Trigeminal neuralgia

Question 7

Abducens Vl

Answer 7

Function: somatic motor to lateral rectus eye muscle
Lesion: medial deviation of eye causing double vision

Question 8

Facial Vll

Answer 8

Function: sensory 2/3 of the tongue taste and somatic motor control of facial expressions
ANS: parasympathetic to salivary glands and lacrimal glands
Lesion: face paralysis called Bell’s palsy, decreased ability to taste and salivate

Question 9

Vestibulocochlear Vlll

Answer 9

Function: Sensory vestibular senses balance, cochlear branch is hearing
Lesion: Vestibular would result in loss of balance and dizziness or vertigo, cochlear would result in loss of hearing

Question 10

Glossopharyngeal lX

Answer 10

Function: somatic motor deals with swallowing motions and sensory deals with 1/3 taste of the tongue and sensory from pharynx and carotid sinus
ANS: parasympathetic to salivary glands
Lesion: trouble swallowing, loss of taste, decreased ability to detect blood pressure changes

Question 11

Vagus X

Answer 11

Function: motor is involved in throat muscles and speech. Sensory is involved in taste, senses from the throat, thoracic and abdominal organs
ANS: parasympathetic to thoracic and abdominal organs, regulating things such as heart rate and respiration
Lesion: trouble swallowing, hoarse speech

Question 12

Accessory Xl

Answer 12

Function: somatic motor to sternocleidomastoid and trapezius muscles
Lesion: Muscle weakness, trouble turning head and raising scapula

Question 13

Hypoglossal Xll

Answer 13

Function: somatic muscles to tongue and throat muscles
Lesion: tongue deviation towards side of lesion, trouble manipulating food with tongue