Practical lab 5

For every cranial nerve, know 4 things: ______

Where it leaves the skull (lab practicum), what it does, how you test it at the bedside, what a lesion looks like

CN I (olfactory) exits the skull through: ______

Cribriform plate

CN I (olfactory) type: ______

Sensory

CN I (olfactory) main function: ______

Smell

CN I (olfactory) bedside test: ______

Familiar odor, one nostril at a time

CN I (olfactory) lesion finding: ______

Anosmia

CN II (optic) exits the skull through: ______

Optic canal

CN II (optic) type: ______

Sensory

CN II (optic) main function: ______

Vision; afferent pupillary reflex

CN II (optic) bedside test: ______

Acuity, visual fields, light reflex

CN II (optic) lesion finding: ______

Field loss (chiasm: bitemporal hemianopia); afferent pupil defect

CN III (oculomotor) exits the skull through: ______

Superior orbital fissure

CN III (oculomotor) type: ______

Motor, parasympathetic

CN III (oculomotor) main function: ______

SR, IR, MR, IO, levator palpebrae; pupil constriction and accommodation

CN III (oculomotor) bedside test: ______

Eye movements, pupils

CN III (oculomotor) lesion finding: ______

Eye down and out, ptosis, dilated pupil

CN IV (trochlear) exits the skull through: ______

Superior orbital fissure

CN IV (trochlear) type: ______

Motor

CN IV (trochlear) main function: ______

Superior oblique

CN IV (trochlear) bedside test: ______

Look down and in

CN IV (trochlear) lesion finding: ______

Vertical diplopia on looking down

CN V (trigeminal) exits the skull through: ______

V1 superior orbital fissure; V2 rotundum; V3 ovale

CN V (trigeminal) type: ______

Sensory, motor

CN V (trigeminal) main function: ______

Facial sensation; muscles of mastication

CN V (trigeminal) bedside test: ______

Light touch in V1–V3, corneal reflex (afferent), clench jaw

CN V (trigeminal) lesion finding: ______

Facial numbness; jaw deviates toward weak side on opening

CN VI (abducens) exits the skull through: ______

Superior orbital fissure

CN VI (abducens) type: ______

Motor

CN VI (abducens) main function: ______

Lateral rectus

CN VI (abducens) bedside test: ______

Look laterally

CN VI (abducens) lesion finding: ______

Eye turned in; cannot abduct

CN VII (facial) exits the skull through: ______

Internal acoustic meatus → stylomastoid foramen

CN VII (facial) type: ______

Motor, sensory (taste), parasympathetic

CN VII (facial) main function: ______

Facial expression, stapedius; taste anterior 2/3; lacrimal, submandibular, sublingual glands

CN VII (facial) bedside test: ______

Raise eyebrows, close eyes tightly, smile, puff cheeks

CN VII (facial) lesion finding: ______

Lower motor neuron: whole same-side face; upper motor neuron: opposite lower face only

CN VIII (vestibulocochlear) exits the skull through: ______

Internal acoustic meatus

CN VIII (vestibulocochlear) type: ______

Sensory

CN VIII (vestibulocochlear) main function: ______

Hearing and balance

CN VIII (vestibulocochlear) bedside test: ______

Whisper, Weber, Rinne

CN VIII (vestibulocochlear) lesion finding: ______

Sensorineural hearing loss, vertigo, nystagmus

CN IX (glossopharyngeal) exits the skull through: ______

Jugular foramen

CN IX (glossopharyngeal) type: ______

Sensory, motor, parasympathetic

CN IX (glossopharyngeal) main function: ______

Sensation and taste of posterior 1/3 tongue; pharyngeal sensation; stylopharyngeus; parotid gland; carotid sinus and body

CN IX (glossopharyngeal) bedside test: ______

Gag reflex (afferent limb)

CN IX (glossopharyngeal) lesion finding: ______

Reduced gag on that side

CN X (vagus) exits the skull through: ______

Jugular foramen

CN X (vagus) type: ______

Motor, sensory, parasympathetic

CN X (vagus) main function: ______

Palate, pharynx, larynx; thoracic and abdominal viscera

CN X (vagus) bedside test: ______

Say "ah"; gag (efferent limb); voice

CN X (vagus) lesion finding: ______

Uvula deviates AWAY from the lesion; hoarseness

CN XI (accessory) exits the skull through: ______

Jugular foramen

CN XI (accessory) type: ______

Motor

CN XI (accessory) main function: ______

SCM and trapezius

CN XI (accessory) bedside test: ______

Shrug shoulders; turn head against resistance

CN XI (accessory) lesion finding: ______

Shoulder droop; weak head turning to the opposite side

CN XII (hypoglossal) exits the skull through: ______

Hypoglossal canal

CN XII (hypoglossal) type: ______

Motor

CN XII (hypoglossal) main function: ______

Tongue muscles

CN XII (hypoglossal) bedside test: ______

Protrude tongue

CN XII (hypoglossal) lesion finding: ______

Tongue deviates TOWARD the lesion

Nerves exiting the superior orbital fissure: ______

CN III, IV, V1, VI

Nerves exiting the jugular foramen: ______

CN IX, X, XI

Nerves exiting the internal acoustic meatus: ______

CN VII and VIII

Gag reflex: afferent limb = ______; efferent limb = ______

CN IX; CN X