Dermatomes, Myotomes, Reflexes, CN Tests Flashcards
C1 dermatome
Vertex of skull
C2 dermatome
Temple, forehead, occipital
C2 myotome
Longus colli, SCM, rectus capitis
C3 dermatome
Entire neck, posterior check, temporal area, under mandible
C3 myotome
Trapezius, splenius capitis
C4 dermatome
Shoulder area, clavicular area, upper scap area
Lateral neck
C4 myotome
Trap, levator
Shoulder shrug
C5 dermatome
Deltoid, anterior aspect of entire arm to base of thumb
Lateral deltoid
C5 myotome
Suprasinatus, infraspinatus, deltoid, bicep
Elbow flexion
C5 reflex
Biceps
C6 dermatome
Anterior arm, radial side of hand to thumb and index finger
Pad of thumb
C6 myotome
Biceps, supinator, wrist extensors
Wrist extension
C6 reflex
Bracioradialis
C7 dermatome
Lateral arm and forearm to index finger, long, ring finger
Pad of middle finger
C7 myotome
Triceps, wrist flexors
Wrist flexion
C7 reflex
Triceps
C8 dermatome
Medial arm and forearm to long, ring and little finger
Pad of 5th
C8 myotome
Ulnar deviators, thumb extensors, thumb adductors
Flex fingers
T1 dermatome
Medial side of forearm to base of little finger
Medial forearm
T1 myotome
Finger abduction
T2 dermatome
Medial side of upper arm to medial elbow, pectoral and mid scap areas
T3-6 myotome
Upper thorax
T5-7 dermatome
Costal margin
T8-12 dermatome
Abdomen and lumbar region
L1 dermatome
Back over trochanter and groin
L2 dermatome
Back, front of thigh to knee
Lateral thigh
L2 mytome
Posas, hip adductors
Hip flexion
L3 dermatome
Back, upper buttock, anterior thigh and knee, medial lower leg
(Medial femoral condyle)
L3 myotome
Psoas, quad,
Knee extension
L4 dermatome
Medial buttock, lateral thigh, medial leg, Dorsum of foot, big toe
(Post medial malleolus)
L4 myotome
Anterior tib, extensor hallucis
Walk on heels
L5 dermatome
Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, 1, 2, 3, toes
(Dorsum of foot between 1,2)
L5 myotome
Extensor hallucis, peroneals, glute med, DFs, hamstring,
Great toe ext
S1 dermatome
Lateral and plantar aspect of foot
Post to lat malleolus
S1 myotome
Walk on toes
S2 dermatome
Buttock, thigh, and posterior leg
S3 dermatome
Groin, posteromedial thigh to knee
S4 dermatome
Perineum, genitals, lower sacrum
CN I
Olfactory (sensory)
Smell - ID familiar odors (coffee, chocolate)
CN II
Optic (sensory)
Eye sight - test visual fields
CN III
Oculomotor (motor) Levator of eyelid, superior medial and inferior recti, inferior oblique Autonomic smooth muscle of eyeball Test upward, downward, and medial gaze, Test reaction to light
CN IV
Trochlear (motor)
Superior oblique muscle
Test Downward and inward gaze
CN V
Trigeminal (both)
Sensory: touch and pain to face, mucous membrane of nose, sinuses, mouth and anterior tongue
Motor: muscles of mastication
Test: corneal reflex, face sensation, clench teeth, push down on chin to seperate jaw
CN VI
Abducens (motor)
Lateral rectus
Test lateral gaze
CN VII
Facial (both)
Taste on anterior tounge
Voluntary facial muscles
Autonomic lacrimal, submandibular, and sublingual glands
Tests: close eyes tight, smile and show teeth, whistle and puff cheeks, ID familiar tastes
VN VIII
Vestibulochoclear (sensory)
Hearing and balance from ear
Tests: can they hear a ticking watch, hearing tests, balance and coordination tests
CN IX
Glossopharyngeal (both)
Sensory: touch and pain to posterior tounge and pharynx, taste on posterior tounge
Motor: select muscles of pharynx, autonomic parotid gland
Test: gag reflex, ability to swallow
CN X
Vagus (both)
Touch and pain to pharynx, larynx, bronchi. Taste to tounge and epiglottis
Muscles of palate, pharynx, and larynx, autonomic thoracic and abdominal viscera
Test: gag reflex, ability to swallow, say “ahhh”
CN XI
Accessory (motor)
SCM and trap
Test resisted shoulder shrug
CN XII
Hypoglossal (motor)
Muscles of tongue
Test tongue protrusion (if injured it deviates toward injured side)
