PNS Anatomy

Question 1

Radiculopathy

Answer 1

Sensory of motor dysfunction caused by pathology of nerve root

Question 2

Dermatome

Answer 2

Somatosensory fiber innervation of one spinal nerve

Question 3

Total loos of sensation requires

Answer 3

3 consecutive sgments to be lost

Question 4

True segmental dermatome patterns

Answer 4

The back - dorsal ramus (true back muscles)

Thoracic regions - ventral ramus (T2-T12)

Question 5

Varicella zoster

Answer 5

Follows dermatome patterns…herpes zoster is other name

Question 6

What is a plexus

Answer 6

Merging of nerves

Question 7

Cervical
Brachial
Lumbosacral plexus levels

Answer 7

Cervical - C1-C4 (phrenic is C3-C5)
Brachial - C5-T1
Lumosacral - L1-S5

Question 8

Upper limb dermatomes

Answer 8

Lateral arm and forearm - C5-C6
Middle part of palm - C7
All medial parts of upper limb C8-T2

Question 9

Trunk-segmental dermatomes

Answer 9

T4 - nipple
T10 - umbilical
L1(2) - lowest level of torso

Question 10

Lower limb anterior dermatoomes

Answer 10

L2-3 - anterior thight
L4 - medial knee
L5 - laterla leg to big toe

Question 11

Lower lib posterior dermatomes

Answer 11

S1 - small toe, lateral foot, sole, calf
S2 - posterior leg and thight
S2-4 - perineum

Question 12

Anus dermatome

Answer 12

Coccygeal levels

Question 13

Upperlimb and lower limb myotomes

Answer 13

Upper - brachial plexus

Lower - lumbosacral plexus

Question 14

Ab/adduction
Flex and extend elbow
Flex and extend wrist
Flx and extend fingers

Answer 14

Ab/Ad - C5
Flex elbow - C5,6
Extend - C6,7
Flex wrist - C7-C8
Extend - C7
Flex fingers - C8-T1
Etend - C7

Question 15

Flex hip
Extend knee
Dorsiflex ankle and extend toes
PLantar flex sankle

Answer 15

Hip - L2-L3
Extend knee - L3-4
Dorsiflex ankle and extend toes - L4-L5
Plantar flex ankle - S1