Sensory System

Question 1

Peripheral Nerve

Answer 1

Part of spinal nerve distal to the spinal nerve root and plexus
Bundles of nerve fibres from more than one dermatome

Question 2

Mononeuropathy

Answer 2

Peripheral nerve damaged individually (trauma/compression)

Question 3

What is a common cause of peripheral neuropathy?

Answer 3

Diabetes

Question 4

Ulnar nerve

Answer 4

Little finger and medial part of ring finger

Question 5

Median Nerve

Answer 5

First 3 fingers (thumb, pointer, middle)

Question 6

Radial Nerve

Answer 6

Tissue next to thumb

Question 7

Sciatic nerve

Answer 7

Backside of leg entire

Question 8

Lateral cutaneous nerve

Answer 8

Anterior part of thigh (lateral)

Question 9

Femoral nerve

Answer 9

Medial anterior part of thigh, passes knee

Question 10

Peroneal nerve

Answer 10

Foot and lateral part of shin

Question 11

Spinal nerve organization

Answer 11

Ventral motor root

Dorsal sensory root

Question 12

Dermatome

Answer 12

Area of skin supplied by a single spinal nerve from a single sensory root

Question 13

C5

Answer 13

Lateral/radial side of antecubital fossa just proximal to elbow

Question 14

C6

Answer 14

thumb

Question 15

C7

Answer 15

Middle finger

Question 16

C8

Answer 16

Little finger

Question 17

T1

Answer 17

Medial/ulnar side of antecubital fossa just proximal to elbow

Question 18

T4

Answer 18

Level of nipples

Question 19

T10

Answer 19

Horizontal level of umbilicus

Question 20

L2

Answer 20

Antero-lateral upper thigh

Question 21

L3

Answer 21

Medial aspect distal thigh/knee

Question 22

L4

Answer 22

Great toe, medial malleolus

Question 23

L5

Answer 23

3rd toe

Question 24

S1

Answer 24

Calcaneus, lateral malleolus, 5th toe

Question 25

Dorsal columns

Answer 25

Carry sensory information about fine touch, vibration and joint position (TVP) Run on ipsilateral side of spinal cord until they reach medulla = cross

Question 26

Spinothalamic Tract

Answer 26

Pain and temperature sensation Fibres enter spinal cord, synapse in dorsal horn and then travel in contralateral side to thalamus and reticular formation

Question 27

Why is light touch examination least helpful in determining site of lesion?

Answer 27

Fibres relaying info about light touch travel in both the posterior columns and anterior spinothalamic tract

Question 28

When does Brown Sequard syndrome occur?

Answer 28

When one half of the spinal cord is damaged - ipsilateral motor weakness and loss of vibration/joint position sense - contralateral loss of pain and temperature

Question 29

Hemi-neglect

Answer 29

Lesions affecting right parietal lobe | Neglect visual, somatosensory or auditory stimuli on left side

Question 29

Hemi-neglect

Answer 29

Lesions affecting right parietal lobe | Neglect visual, somatosensory or auditory stimuli on left side

Question 30

What is the key test stimulus when using the neurotip?

Answer 30

Sharp - limit the number of dull checks

Question 31

What is tested in the sensory exam?

Answer 31

Light touch Superficial pain Proprioception - Joint Position Sense Vibration