Usmle Step 1 Fa Neurology-Cranial Nerves Skull Base

Front 1

Pineal glandjfct

Back 1

Melatonin secretion, circadian rhythms

Front 2

Superior colliculi fct

Back 2

Conjugate vertical gaze center

Front 3

Inferior colliculi fct

Back 3

Auditory

Front 4

Parinaud syndrome

Back 4

Paralysis of conjugate vertical gaze due to lesion of superior colliculi (pinealoma)

Front 5

Cranial nerve nuclei located in midbrain

Back 5

CNIII, IV

Front 6

Cranial nerve nuclei located in pons

Back 6

CNV, VI, VII, VIII

Front 7

Cranial nerve nuclei located in medulla

Back 7

CN IX, X, XI, XII

Front 8

Lateral cranial nerve nuclei tend ot be?

Back 8

Sensory

Front 9

Medial cranial nerve nuclei tend to be?

Back 9

Motor

Front 10

Nucleus solitarus
(a) assoc CN (s)
(b) fct

Back 10

(a) visceral sensory info (taste, baroreceptors, gut distention)
(b) VII, IX, X

Front 11

Nucleus ambiguus
(a) assoc CN (s)
(b) fct

Back 11

(a) motor innervation to pharanx, larynx, and upper esophogus (swallowing, palatal elevation)
(b) IX, X, XII

Front 12

Dorsal motor nucleus

Back 12

Sends autonomic (parasympathetic) fibers to heart, lungs, upper GI tract

Front 13

Associated passing structure(s): cribriform plate

Back 13

CNI

Front 14

Associated passing structure(s): middle cranial fossa (through sphenoid bone)

Back 14

CNII-VI

Front 15

Associated passing structure(s): optic canal

Back 15

CN II, opthalmic artery, central retinal vein

Front 16

Associated passing structure(s): superior orbital fissure

Back 16

CNIII, IV, VI, V-1, opthalmic vein

Front 17

Associated passing structure(s): Foramen Rotundum

Back 17

CN V-2

Front 18

Associated passing structure(s): Foramen ovale

Back 18

CN V-3

Front 19

Associated passing structure(s): Foramen spinosum

Back 19

Middle meningial a

Front 20

Associated passing structure(s): posterior cranial fossa

Back 20

CNVII-XII through temporal or occipital bone

Front 21

Associated passing structure(s): internal auditory meatus

Back 21

CNVII, VIII

Front 22

Associated passing structure(s): jugular foramen

Back 22

VN IX, X, XI, jugular vein

Front 23

Associated passing structure(s): foramen magnum

Back 23

Psinal roots of CNXI, brain stem, vertebral arteries

Front 24

CNXII lesion

Back 24

Tongue deviates towards side of lesion

Front 25

CNV motor lesion

Back 25

Jaw deviates towards side of lesion

Front 26

CNX lesions

Back 26

Uvula deviates away from side of lesion

Front 27

CNXI lesion

Back 27

Weakness in turning head to contralateral side of lesion
Shoulder droop on side of lesion

Front 28

Muscles of mastication; which opens?

Back 28

Masseter, temporalis, medial pterygoid
Lateral pterygoid closes

Front 29

Palatoglossus innervated by what?

Back 29

CNX (other glossus muscles are CNXII)

Front 30

All muscles with the root palat are innervated by what? Exception?

Back 30

Vagus nerve
But tensor veli palatini is innervated by mandibular branch of CNV