|
AH 321
Neurology Dermatome Laboratory
Test each of the following dermatomes for three (3) your
classmates and record.
| Root |
Sensation |
L1
|
R1
|
L2
|
R2
|
L3
|
R3
|
| C5 |
Lateral arm Axillary nerve
|
|
|
|
|
|
|
| C6 |
Lateral Forearm Musculocutaneous
Nerve
|
|
|
|
|
|
|
| C7 |
Middle Finger |
|
|
|
|
|
|
| C8 |
Medial Forearm Med.
Antebrachial Cutaneous Nerve
|
|
|
|
|
|
|
| T1 |
Medial Arm Medial Brachial
Cutaneous Nerve
|
|
|
|
|
|
|
| Nerve |
Sensation Test |
L1
|
R1
|
L2
|
R2
|
L3
|
R3
|
| Radial Nerve |
Dorsal web Space between
Thumb & Index Finger |
|
|
|
|
|
|
| Ulnar Nerve |
Distal Ulnar Aspect-Little
Finger |
|
|
|
|
|
|
| Median Nerve |
Distal Radial Aspect-Index
Finger |
|
|
|
|
|
|
| Axillary Nerve |
Lateral Arm-Deltoid patch on
Upper Arm |
|
|
|
|
|
|
| Musculocutaneous Nerve |
Lateral Forearm |
|
|
|
|
|
|
| Root |
Sensation |
L1
|
R1
|
L2
|
R2
|
L3
|
R3
|
| L1 |
Back, over trochanter and
groin |
|
|
|
|
|
|
| L2 |
Back, front of thigh to knee |
|
|
|
|
|
|
| L3 |
Back, upper buttock,
anterior thigh and knee, medial lower leg |
|
|
|
|
|
|
| L4 |
Medial buttock, lateral
thigh, medial leg, dorsum of foot, big toe |
|
|
|
|
|
|
| L5 |
Buttock, posterior and
lateral thigh, lateral aspect of leg, dorsum of foot,
medial half of sole, first, second, and third toes |
|
|
|
|
|
|
| S1 |
Buttock, thigh, and leg
posterior |
|
|
|
|
|
|
| S2 |
Buttock, thigh, and leg
posterior |
|
|
|
|
|
|
| S3 |
Groin, medial thigh to knee |
|
|
|
|
|
|
| S4 |
Perineum, genitals, lower
sacrum |
|
|
|
|
|
|
With a washable pen, mark each of the following dermatomes on
your partner.
Split into four groups, each using a different of the
following authorities to do your mapping.
Segment
|
Key
movements to test
|
Key
sensory areas to test
|
| C1-C4 |
Neck flexion |
Head and face |
| C3 |
Neck lateral flexion |
Lateral neck |
| C4 |
Shoulder elevation |
Top of shoulder |
| C5 |
Shoulder abduction |
Lateral arm & forearm |
| C6 |
Elbow flexion, wrist
extension |
Thumb & index finger |
| C7 |
Elbow extension, wrist
flexion |
Middle finger |
| C8 |
Ulnar deviation, thumb
extension |
Ring & small finger |
| T1 |
Approximation of fingers |
Medial forearm |
| L1-L2 |
Hip flexion |
Front of thigh |
| L3 |
Knee extension |
Front of knee |
| L4 |
Ankle dorsiflexion |
Medial leg |
| L5 |
Toe extension |
Lateral leg |
| S1 |
Ankle plantar flexion |
Sole of foot |
| S2 |
Knee flexion |
Back of thigh |
| |
Dermatomes |
Reflex |
Myotomes |
| C5 |
lateral side of arm &
elbow |
Biceps |
biceps, brachioradialis,
supinator |
| C6 |
lateral side of forearm |
Brachioradialis |
biceps, brachioradialis,
supinator, wrist & finger extensors |
| C7 |
middle of anterior forearm |
Triceps |
triceps & flexor carpi
radialis |
| C8 |
medial forearm &
posterior elbow |
|
flexor carpi ulnaris, flexor
digitorum profundus, pronator quadratus, opponens
pollicis, & interossei |
| T1 |
medial arm & elbow |
|
flexor carpi ulnaris, flexor
digitorum profundus, pronator quadratus, opponens
pollicis, & interossei, flexor pollicis |
Major Peripheral Nerve Testing
| Nerve |
Motor Test |
Sensation Test |
| Radial Nerve |
Wrist Extension Thumb
Extension
|
Dorsal web Space between
Thumb & Index Finger |
| Ulnar Nerve |
Abduction-Little finger |
Distal Ulnar Aspect-Little
Finger |
| Median Nerve |
Thumb Pinch Opposition of
Thumb
Abduction of Thumb
|
Distal Radial Aspect-Index
Finger |
| Axillary Nerve |
Deltoid |
Lateral Arm-Deltoid patch on
Upper Arm |
| Musculocutaneous Nerve |
Biceps |
Lateral Forearm |
|
