neurophysiology

Question 1

What is the innervation, nerve root and action of the deltoid?

Answer 1

C5- axillary nerve. Shoulder abduction

Question 2

What is the innervation, nerve root and action of the biceps?

Answer 2

C6-musculocutaneous nerve. Elbow flexion

REMEMBER biceps is 6 letters and so innverated by c6

Question 3

What is the innervation, nerve root and action of the triceps?

Answer 3

C7-radial nerve. Elbow extension.

REMEMBER triceps is 7 letter and so is innverated by c7

Question 4

What is the innervation, nerve root and name of the muscle that does wrist extensions?

Answer 4

C8-radial. Extensor corpi radialis

Question 5

What is the innervation, nerve root and name of the muscle tha does wrist flexion?

Answer 5

Flexor corpi ulnaris- C8- ulnar.

Question 6

What is the innervation, nerve root and name of the muscle that does abduct fingers?

Answer 6

First dorsal interossei- C8- ulnar

Question 7

What is the innervation, nerve root and name of the muscle that does abduction of little fingers?

Answer 7

Abductor digiti minimi-C8-ulnar

Question 8

What is the innervation, nerve root and name of the muscle that flexes thumbs?

Answer 8

Abductor pollicis brevis-T1/C8-median.

Question 9

What is the acronym for what the median nerve does in the hand?

Answer 9

LOAF
lumbricals
opponens pollicis
abductor pollicis brevis
flexor pollicis brevis
everything else in hand is innvervated by ulnar nerve

Question 10

What do the dermatomes of the upper limbs innervate?

Answer 10

C5- outer arm 
C6-side index finger 
C7-middle finger 
C8-little finger 
T1-forearm

Question 11

What do the radial, ulnar and median nerves innervate in the hand?

Answer 11

Median=thumb, pointer and half of ring finger. (remmeber it takes two nerve to make a marriage)

ULNAR=little and half of ring finger

Radial= dorsum hand and snuffbox

Question 12

What muscle, nerve and nerve root does hip flexion?

Answer 12

Iliopsoas- L1-femoral nerve.

Question 13

What muscle, nerve and nerve root does hip extension?

Answer 13

Glutemous maximus- L1-inferior gluteal nerve.

Question 14

What muscle, nerve and nerve root does knee extension?

Answer 14

Quadriceps- L3/L4 (kick the door)-femoral nerve.

Question 15

What muscle, nerve and nerve root does knee flexion?

Answer 15

Hamstrings- sciatic nerve.L4-S3

Question 16

What muscle, nerve and nerve root does foot dorsiflexion?

Answer 16

anterior compartment of the leg including Tibialis anterior- peroneal nerve-L4/L5.
other muscles are: gastrocnemius, soleus, plantaris

Question 17

What muscle, nerve and nerve root does foot plantarflexion?

Answer 17

L5/S1- tibiliaris posterior- tibial nerve

other muscles of the posterior comparment include extensor hallucis longus and extensor digitorum longus

Question 18

What can damage to the peroneal nerve cause and what is this one of the first symptoms of?

Answer 18

Can get foot drop, which is the first presentation of MND

Question 19

What do the dermatomes of the lower limb innervate?

Answer 19

L1- top of thigh and groin 
L2-thigh 
L3-knee 
L4-Over tibia 
L5-top of foot 
S1-bottom of foot laterally or the sole

Question 20

Whats the difference between an EMG and a nerve conduction study?

Answer 20

• nerve conduction studies –records speed. If small, then indicates axon loss due to DM or alcohol. If slow indicates demyelination by GBS. NEUROPATHIES
• EMG- ask to contract muscle- small wave means muscle problem and large wave means nerve problem-Myasthenia gravis. Anti ACh-R in blood. Time in between contraction of the muscle fiber varies