Dermatomes part 3

Question 1

What is a motor unit?

Answer 1

Single motor neurone and the skeletal fibres it innervates

spinal nerve contains many

Question 2

L2 myotome job

Answer 2

Hip flexion

Question 3

L3 myotome job

Answer 3

Knee extension

Question 4

L4 myotome job

Answer 4

ankle dorsiflexion

Question 5

L5 myotome job

Answer 5

Great toe extension

Question 6

S1 myotome job

Answer 6

Ankle plantar flexion

Question 7

S2 myotome job

Answer 7

Great toe flexion

Question 8

what is hiltons law?

Answer 8

Nerve crossing a joint supplies:

• Skin over the insertion (dermatome)
• Joint itself
• Muscles acting on the joint

Question 9

What happens to muscles in peripheral nerve injury?

Answer 9

Muscles distal to site of injury = paralysis
Anaesthesia in cutaneous distribution of nerve AND BRANCHES
(eg femoral nerve = loss in saphenous nerve too)

Question 10

What is neural level clinically?

Answer 10

Lowest level of fully intact sensation and motor function