Cranial Nerves 21% Flashcards
Sensory:
- Smell (coffee, mint) is tested one nostril at a time with eyes closed
Olfactory (I)
Lost sense of smell (CN I)
Anosmia
Distorted sense of smell (CN I)
Parosmia
Sensory:
- Vision is tested with Snellen Chart for visual acuity, visual fields (peripheral vision)
Optic (II)
Direct Light Reflex CN
CN II Optic & III Oculomotor
Indirect (consensual) Light Reflex CN
CN II Optic & III Oculomotor
Eyes converge, pupils constrict & lens convexity (CN II)
Accommodation
What cranial nerves are tested together with the Six Cardinal Fields of Gaze?
CN III Oculomotor, IV Trohlear, VI Abducens
LR6, SO4, O3
Motor:
Levator Palpebrae, Inferior Oblique, Superior, Medial and Inferior Rectus
Oculomotor (III)
Parasympathetic: Ciliary muscles (lens shape) and constrictor papillae
Oculomotor (III)
Which CN:
- Direct Light Reflex
- Indirect Light Reflex
- Accommodation
CN II Optic & III Oculomotor
Deviation of one or both eyes
Strabismus
Eyelids droop due to weakness or paralysis of levator palpebrae
Ptosis
Motor:
Superior Oblique muscle (down, in)
Ex: look at the tip of your nose
Trochlear (IV)
Sensory:
To Face (V1-3)
Touch forehead, cheekbone & chin with cotton wisp
Trigeminal (V)
Corneal Reflex
- What CN is for afferent & which is efferent?
Touch cornea with cotton wisp, both eyes blink or tear normally
TQ
CN V (Trigeminal) is afferent (sensory) CN VII (Facial) is efferent (motor)
Jaw Jerk Reflex CN?
The mandible is tapped with hammer and jaw draws upward
CN V Trigeminal
Oculocardiac Reflex CN for afferent & efferent?
Press on eye and heart rate decreases
CN V Trigeminal is afferent (sensory)
CN X Vagus is efferent (motor)
General sensation to the anterior 2/3 of the tongue (sensory)
TQ
CN V Trigeminal
Motor:
Muscles of Mastication
TQ
Trigeminal (V)
Extreme, sporadic, sudden burning or shock-like face pain that lasts anywhere from a few seconds to as long as 2 minutes per episode. Lightening like, excruciating pain is repetitive, occurring several times per day. Pain is typically felt on one side of the jaw or cheek.
Tic Douloureaux aka Trigeminal Neuralgia
CN V Trigeminal
Motor:
to Lateral Rectus Muscle
TQ
Abducens (VI)
Sensory:
Taste - anterior 2/3 of tongue
(sweet, sour, salty)
Facial (VII)
Motor:
Muscles of facial expression
Facial (VII)
Unilateral facial paralysis caused by trauma, virus, or immune mediated response and is not permanent. Initial pain behind ipsilateral ear, twitching, weakness or paralysis, drooping eyelid, drooping corner of mouth, drooling, dry eye & impairment of taste.
TQ
Bell’s Palsy
Facial VII CN
What is the difference between Bell’s Palsy and Stroke?
Bells: Ipsilateral Motor loss of entire face & forehead does NOT wrinkle
Stroke: contralateral motor loss below eye & forehead does wrinkle
Sensory:
Balance, Mittelemeyer, Barany Caloric Test, Rombergs
VIII. Vestibulocochlear - Vestibular part
Sensory:
Hearing, Weber, Rinne, Whisper, Auditory Acuity/Watch
TQ
VIII. Vestibulocochlear - Cochlear part
Cause is unknown, but probably results from an abnormality in the fluids of the inner ear. Symptoms are episodic rotational vertigo, hearing loss, & tinnitus.
Meniere’s Disease
aka Endolymphatic Hydrops
VIII. Vestibulocochlear CN
Sensory (Afferent):
- Gag (Pharyngeal) Reflex
- Uvula Reflex
- Carotid Reflex: massage carotids and heart rate drops
- Taste to posterior 1/3 of tongue (bitter)
TQ
IX. Glossopharyngeal
Motor:
Stylopharyngeus muscle elevates pharynx & larynx; dilates pharynx to permit swallowing
IX. Glossopharyngeal
Sensory:
Epiglottis & laryngeal muscles of swallowing (palate, pharynx, contracting muscles)
X. Vagus
Motor (efferent):
- Gag Reflex
- Uvular Reflex
- Carotid Reflex
TQ
X. Vagus
Uvular Reflex: palate and uvula deviate to the _____ side of lesion when patient says “AHHHH”
TQ
Opposite side of lesion (Vagus)
Motor:
Trapezius & SCM muscles
- Shoulder shrug against resistance
TQ
XI. Spinal Accessory
Spasm of SCM muscle?
Torticollis aka Wry Neck
XI. Spinal Accessory CN
Motor:
Tongue muscles
- Stick tongue out; tongue will deviate _____ side of lesion
- Look for atrophy & fasciculations
TQ
XII. Hypoglossal
Toward side of lesion
Involuntary motor responses to potentially harmful stimuli?
Reflexes
T/F - All reflex tests are done bilaterally with the normal side tested first.
True
Absence of any DTR, especially patellar (LMNL)
Westphal’s Sign
Brings out reflexes by cortical distraction?
Jendrassik’s Maneuver
aka Reinforcement Test
Deep Tendon Reflexes: Wexler Scale 0+ 1+ 2+ 3+ 4+ 5+
0+ Absent with reinforcement 1+ Hypoactive with no reinforcement 2+ Normal 3+ Hyperactive 4+ Hyperactive with transient clonus ~~ TQ 5+ Hyperactive with sustained clonus
DTR: Jaw Jerk
Trigeminal V
DTR: Biceps
Musculocutaneous (C5)
DTR: Brachioradialis
TQ
Radial (C6)
DTR: Triceps
TQ
Radial (C7)
DTR: Patella aka Knee Jerk
Femoral (L4)
DTR: Medial Hamstring
Sciatic (L5)
DTR: Achilles aka Ankle Jerk
Tibial (S1)
Superficial Reflexes:
Corneal - touch with cotton wisp produces blinking or tearing
V. Trigeminal (afferent)
VII. Facial (efferent)
Superficial Reflexes:
Gag/Pharyngeal - touch back of tongue with tongue blade to produce gagging
IX. Glossopharyngeal (afferent)
X. Vagus (efferent)
Superficial Reflexes:
Stroke inner thigh of male; ipsilateral rise in testes
Cremasteric (L1) Femoral Nerve (afferent) Genitofemoral Nerve (efferent)
Superficial Reflexes:
Stroke inner thigh of female; poupart’s ligament contracts
Geigel's (L1) Femoral Nerve (afferent) Genitofemoral Nerve (efferent)
Superficial Reflexes:
Stroke up sole of foot; see curling of toes & pulling away of foot
Plantar (L4-S2) Tibial Nerve (afferent & efferent)
Superficial Reflexes:
Abdominal - stroke in all 4 abdominal quadrants away from umbilicus.
Normal = umbilicus moves toward side stroked
Afferent & Efferent:
Upper T7-T9 & Lower T10-T12
Superficial Reflexes:
While observing the umbilicus, the pt does a partial sit up.
Normal = umbilicus stays midline
TQ
Beevor’s
Afferent & Efferent:
Upper T7-T9 & Lower T10-T12
Lesion of the brain and spinal cord not including the anterior horn cells
UMNL
Lesion of the anterior horn cells out to the myoneural junction
LMNL
Paralysis: UMNL? LMNL?
UMNL: Spastic
LMNL: Flaccid
Deep Tendon Reflexes: UMNL? LMNL?
UMNL: Hyperactive
LMNL: Hypoactive/Absent
Pathological Reflex: UMNL? LMNL?
UMNL: Present
LMNL: Absent
Clonus: UMNL? LMNL?
UMNL: Present
LMNL: Absent
Tone: UMNL? LMNL?
UMNL: Hypertonic
LMNL: Hypotonic
Reaction of Degeneration: UMNL? LMNL?
UMNL: Absent
LMNL: Present
Atrophy: UMNL? LMNL?
UMNL: Absent
LMNL: Present
Fasiculation: UMNL? LMNL?
UMNL: Absent
LMNL: Present
Superficial Reflexes: UMNL? LMNL?
UMNL: Absent
LMNL: Absent
Visceral Organic Reflexes:
Absent in UMNL & LMNL
Pinch neck while noting dilation of the eyes
Ciliospinal - Sensory from neck
Cervical sympathetics
Visceral Organic Reflexes:
Absent in UMNL & LMNL
Press on eye while noting the slowing of the heart by 10 bpm
Oculocardiac
V. Trigeminal
X. Vagus
Visceral Organic Reflexes:
Absent in UMNL & LMNL
Press on carotid sinus while noting the slowing of the heart & decreased pressure
Carotidcardio reflex
IX. Glossopharyngeal
X. Vagus
Which CN are sensory only?
I. Olfactory
II. Optic
VIII. Vestibulocochlear
Which CN are motor only?
III. Oculomotor IV. Trochlear VI. Abducens XI. Spinal Accessory XII. Hypoglossal
Which CN are both sensory & motor?
V. Trigeminal
VII. Facial
IX. Glossopharyngeal
X. Vagus
Pathological Reflex indicates UMNL:
Stroke up lateral aspect of foot to great toe
Babinski:
Dorsiflexion of great toe with splaying of other toes (+)
Pathological Reflex indicates UMNL:
Stroke lateral malleolus to fifth toe
Chaddock:
Babinski-like response (+)
Pathological Reflex indicates UMNL:
Stroke down tibial crest to the ankle
Oppenheim:
Babinski-like response (+)
Pathological Reflex indicates UMNL:
Squeeze the calf below the knee
TQ
Gordon’s Calf:
Babinski-like response (+)
Pathological Reflex indicates UMNL:
Squeeze Achilles tendon
Schaefer:
Babinski-like response (+)
Pathological Reflex indicates UMNL:
Tap the ball of the foot
Rossolimo:
Plantar flexion of great toe with curling of other toes (+)
Pathological Reflex indicates UMNL:
Examiner extends middle phalanx & flicks distal phalanx inferior
Hoffman:
Flexion & adduction of thumb and flexion of fingers (+)
Pathological Reflex indicates UMNL:
Examiner sharply taps the tips of the middle 3 fingers
Tromner:
Flexion & adduction of thumb and flexion of the fingers (+)
Pathological Reflex indicates UMNL:
Examiner strokes the pisiform of the pt
Gordon’s finger:
Flexion of wrist & fingers, or thumb & index finger (+)
Pathological Reflex indicates UMNL:
Examiner strokes the distal ulnar side of the forearm near the wrist
Chaddock’s Wrist:
Flexion of wrist with extension & fanning of fingers (+)
Muscle Grading:
5, 4, 3, 2, 1, 0
TQ
5 - Normal: complete ROM, against gravity, full resistance
4- Good: complete ROM, against gravity, some resistance
3 - Fair: complete ROM, against gravity
2 - Poor: complete ROM, no gravity
1 - Trace: evidence of slight contractility w/ no joint motion
0 - Zero: no evidence of contractility
C5 nerve root: Motor function?
Arm Abduction / Forearm Flexion
C5 nerve root: Muscle?
Middle Deltoid / Biceps Brachii
C5 nerve root: Sensory?
Lateral Arm
C5 disorder
Erb’s Palsy
Paralysis of the arm primarily from dystocia; LMN syndrome; MC affected nerves are Suprascapular N, Musculocutaneous N, and Axillary N.
C6 nerve root: Motor function?
Wrist Extension
C6 nerve root: Muscle?
Extensor Carpi Ulnaris/Radialis & Brachialis
C6 nerve root: Sensory?
Lateral Forearm & Digits 1-2
C6 disorder
*** Erb’s Palsy
C7 nerve root Motor Function?
Wrist Flexion & Finger extension
C7 nerve root muscles
Flexor Carpi Ulnaris/Radialis & Triceps
C7 nerve root sensory?
3rd Digit
C7 nerve root disorder
Wrist Drop
C8 motor function
Finger Flexion
C8 muscles
Flexor Digitorum Superficialis/Profundus & Lumbricals
C8 sensory
Medial Forearm & Digits 4-5
C8 nerve root disorder
*** Klumpke’s Paralysis (C8-T1)
Paralysis involving the intrinsic muscles of the forearm & hand; “Claw Hand”; lower brachial plexus injury
T1 nerve root motor function
Finger abduction & adduction
T1 nerve root muscle
Dorsal Interossei & Palmer Interossei
T1 nerve root sensory
Medial Elbow
T5-T12 nerve root motor function
Trunk Flexion
T5-T12 nerve root muscle
Rectus Abdominus
T5-T12 nerve root sensory
T5-T12 follow vertebral levels
L1-L3 nerve root motor funtion
Hip Flexion
L1-L3 nerve root muscle
Iliopsoas
L1-L3 nerve root sensory
Inguinal Ligament (L1), Oblique (L2), Oblique across Knee (L3)
L1-L3 nerve root disorder
*** Meralgia Paresthetica
Numbness/pain in outer thigh caused by injury to the nerve from thigh to spinal column.
Lateral Cutaneous Nerve of the thigh
L2-L4 nerve root motor function
Hip flexion & adduction
Knee extension
L2-L4 nerve root muscle
Quadriceps & Adductors
L4 nerve root motor function
Inversion & Dorsiflexion
L4 nerve root muscle
Tibialis Anterior
L4 nerve root sensory
Medial aspect of leg & foot
L4 nerve root disorder
Foot Drop
Gait abnormality; Common Fibular Nerve; unable to extend toe or dorsiflex ankle; common with ALS, MS, Cerebral Palsy
L5 nerve root motor function
Toe extension, Heel walk, Hip abduction
L5 nerve root muscle
Extensor digitorum
Extensor Hallucis Longus
Gluteus Medius & Minimus
L5 nerve root sensory
Lateral aspect of the leg across dorsum of foot to big toe
L5 disorder
Foot Drop
Gait abnormality; Common Fibular Nerve; unable to extend toe or dorsiflex ankle; common with ALS, MS, Cerebral Palsy
S1 nerve root motor function
Eversion
Plantar Flexion
Hip Extension
S1 nerve root muscle
Peroneus longus/brevis
Gluteus Maximus
S1 nerve root sensory
Lateral aspect of foot & plantar surface of foot
S2-S4 nerve root motor function
Anal wink
S2-S4 nerve root muscle
Levator Ani & Coccygeus
S2-S4 nerve root sensory
Perianal
S2-S4 nerve root disorder
Cauda Equina
Axillary Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Arm Abduction
Deltoid & Teres Minor
Lateral Arm
Glenohumeral Dislocation
Radial Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Wrist/Finger Extension & Thumb Abduction
Wrist/Finger Extensors & Triceps
Dorsal web between thumb and index
Wrist Drop, Crutch Palsy, Erb’s Palsy
Musculocutaneous Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Elbow Flexion
Biceps, Brachialis, Coracobrachialis
Lateral Forearm
Impingement
Median Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Thumb pinch, Opposition of thumb
Wrist & thumb flexors, Thumb abductors, Thenar
Distal Radial hand, 2nd digit
Carpal Tunnel, Pronator Teres, Ape Hand
Ulnar Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Abduction of 5th digit & Adduction of Thumb
Finger abductors/adductors & Thumb adductors
Distal Ulnar Hand, 5th digit
Claw Hand
Dorsal Scapular Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Elevation & Retraction of Scapula
Rhomboids & Levator Scapula
NO sensory
Flaring of Scapula
Long Thoracic Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Protraction of Scapula
Serratus Anterior
NO sensory
Winged Scapula
Lateral Femoral Cutaneous Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
No Motor function
No Muscle innervation
Lateral Thigh
Meralgia Paresthetica
Saphenous Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
No motor function
No muscle
Anteromedial Knee & Medial Leg
No disorder
Obturator Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Hip Adduction
Hip Adductor muscles
Medial Thigh
Impingement
Femoral Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Hip Flexion, Knee Extension
Iliopsoas, Quadriceps
Anteromedial Thigh & Leg
Impingement
Sciatic Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Flexion of the Knee
Hamstrings
Ant/Post Leg & Sole/Dorsum of Foot
Piriformis Syndrome (15%)
Peroneal Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Foot Dorsiflexion, Inversion & Eversion
Tib Anterior, Toe Extensors, Peroneals
Anterior leg & Dorsum of foot
Fibular Head fracture
Medial Plantar Nerve:
- Motor function
- Muscle
- Sensory
- Disorder
Toe Flexion
Toe Flexor muscles
NO sensory
Tarsal Tunnel Syndrome
List the 10 Peripheral Nerve Entrapments
"DR CUMA" D - Drop Wrist R - Radial Nerve C - Claw Hand U - Ulnar Nerve M - Median Nerve A - Ape Hand
Pain along the sensory distribution of a nerve root
Dermatogenous
Pain that originates within a muscle
Myotogenous
Pain that arises from structures derived from embryological sclerotomes (joint pain)
Scleratogenous
Pain along the course of a dermatome due to irritation of a nerve root
Radicular
Pain along scleroderm of origination involving more than one kind of tissue (shared pathway)
Referred
Muscle - type of pain
Cramping, spasm, aching, dull
Nerve - type of pain
Shooting, radiating, burning
Circulation - type of pain
Throbbing, pulsating
Bone Cancer - type of pain
Constant, deep, boring, nocturnal, progressive, unremitting
Scleratogenous - type of pain
Poorly localized, dull, ache
Myofascial - type of pain
Trigger Points
Gallbladder referred pain sites
Right Shoulder, Inferior Scapula
Pancreas referred pain sites
Spine & T10 level (epigastric)
Heart referred pain sites
Left Shoulder & Medial Left arm
Intestines referred pain sites
Periumbilical
Appendix referred pain sites
Epigastric (early) or RLQ (late)
Kidney referred pain sites
Flank pain
Ureter referred pain sites
Groin
Bladder referred pain sites
Suprapubic area
Normal findings include ability for patient to distinguish between sharp and dull sensations with their eyes closed.
Dermatomes
Abnormalities for Dermatomes
Anesthesia - no feeling
Hypoesthesia - minimal sense of feeling
Hyperesthesia - increased sense of feeling
C4 dermatome
Neck (C7 location)
C5 dermatome
Lateral arm shoulder to elbow
C6 dermatome
Lateral forearm & 1st two digits
C7 dermatome
Middle finger (3rd digit)
C8 dermatome
Medial forearm & 4th and 5th digits
T1 dermatome
Medial Elbow
T2 dermatome
Medial upper arm into axilla
T10 dermatome
Waist at bellybutton level
T11 dermatome
Waist just below bellybutton
T12 dermatome
Above hip down to groin area
L1 dermatome
Upper 1/3 of thigh
L2 dermatome
Middle 1/3 of thigh
L3 dermatome
Lower 1/3 of thigh just above knee
L4 dermatome
Medial calf to bottom of foot
L5 dermatome
Lateral calf to top of toes
S1 dermatome
Lateral foot
Ménière’s disease is associated with what CN?
VIII. Vestibulocochlear
Torticollis aka Wry Neck is associated with which CN?
XI. Spinal Accessory Nerve
Paralysis of the arm from dystopia;
LMN Syndrome;
MC affected nerves are Suprascapular, Musculocutaneous, and Axillary
Erb’s Palsy
Paralysis involving intrinsic muscles of forearm and hand from lower brachial plexus injury.
Klumpke’s paralysis
Numbness/Pain in outer thigh caused by injury to nerve from thigh to spinal column.
Lateral cutaneous nerve of the thigh
Meralgia Paresthetica
Gait abnormality; Common Fibular Nerve; associated with ALS, MS, and Cerebral Palsy.
Nerve roots affected are L4-5
Foot Drop