Dermatomes Flashcards
(27 cards)
A dermatome is defined as:
the area of skin supplied by a single nerve root
The area innervated by a nerve
root is larger than that innervated by ____
a peripheral nerve
Sensory information from a specific dermatome is transmitted by the ___ to the ___ of a specific segment of the spinal cord.
sensory nerve fibers
spinal nerve
Pressure on nerve roots leads to loss of ____, but the loss is often not as obvious as when pressure is applied to ____
muscle tone and mass
a peripheral nerve
Because the peripheral nerve that innervates the muscle is usually supplied by ____ more muscle fibers are likely to be affected
and wasting or atrophy is more evident if the ___ is damaged.
more than one nerve root
peripheral nerve itself
C1
Vertex of skull
C2
Temple, forehead, occiput
C3
Entire neck, posterior cheek, temporal area, under mandible
C4
Shoulder, clavicle, upper scapula
C5
Deltoid area, anterior arm to base of thumb
C6
Anterior arm, radial side of hand to thumb and index finger
C7
Lateral arm/forearm to index, long, and ring fingers
C8
Medial arm/forearm to long, ring, and little fingers
T1
Medial forearm to base of little finger
T2
Medial upper arm to medial elbow, pectoral and midscapular areas
T3-T6
Upper thorax
T5-T7
Costal margin
T8-T12
Abdomen and lumbar region
L1
Back, over greater 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/lateral thigh, lateral leg, dorsum of foot, sole (medial half), toes 1–3
S1
Buttock, posterior thigh and leg
