UE Dermatomes

Question 1

dermatomes

Answer 1

-cutaneous area whose sensory innervation is derived from a single spinal nerve (i.e., posterior root)
-segmental organization of the spinal cord + associated nerves

Question 2

what are dermatomes used for

Answer 2

differential diagnosis as part of a thorough neurological exam

Question 3

cervical dermatomes

C2

Answer 3

-temple
-forehead
-occiput

Question 4

cervical dermatomes

C3

Answer 4

-entire neck
-posterior cheek
-temporal area

Question 5

cervical dermatomes

C4

Answer 5

-shoulder area
-clavicular area
-upper scapular area

Question 6

cervical dermatomes

C5

Answer 6

-deltoid area
-anterior aspect of arm

Question 7

cervical dermatomes

C6

Answer 7

-anterior/lateral arm
-radial side of hand to thumb

Question 8

cervical dermatomes

C7

Answer 8

-hand
-index, long + ring fingers

Question 9

cervical dermatomes

C8

Answer 9

medial hand to little finger

Question 10

thoracic dermatomes

T1

Answer 10

medial side of forearm

Question 11

thoracic dermatomes

T2

Answer 11

-medial side of upper arm to medial elbow
-pectoral area
-midscapular area

Question 12

thoracic dermatomes

T3-T6

Answer 12

upper thorax

Question 13

thoracic dermatomes

T5-T7

Answer 13

costal margin

Question 14

thoracic dermatomes

T8-T12

Answer 14

abdomen + lumbar region

Question 15

myotomes

Answer 15

a group of muscles innervated by a single spinal nerve (i.e., anterior root)

Question 16

muscles that receive innervation from more than 1 spinal nerve root comprise one/multiple myotome(s)

Answer 16

multiple myotomes

Question 17

what are myotomes used for

Answer 17

differential diagnosis as part of a thorough neurological exam