Segmental innervation of muscles (dave's notes)

Question 1

What is the myotome of the hip?

Answer 1

L2,3 flex

L4,5 extend

Question 2

What is the myotome of the knee?

Answer 2

L3,4 extend

L5, S1 flex

Question 3

What is the myotome of the ankle?

Answer 3

L4,5 dorsiflex

S1,2 plantarflex

Question 4

Give the myotome of C4

Answer 4

Diaphragm - respiration

Question 5

Give the myotome of C5

Answer 5

Deltoid - abduction of shoulder

Question 6

Give the myotome of C6

Answer 6

Biceps - flexion of elbow (biceps jerk)

Question 7

Give the myotome of C7

Answer 7

Triceps - extension of elbow (triceps jerk)

Question 8

Give the myotome of C8

Answer 8

FDP and ED - finger flexion and extension

Question 9

Give the myotome of T1

Answer 9

APB - abduction of thumb

Question 10

Give the myotome of T7-12

Answer 10

Anterior abdominal wall muscles (abdominal reflex)

Question 11

Give the myotome of L1

Answer 11

Lowest fibres of oblique and transversus

Question 12

Give the myotome of L2

Answer 12

Psoas major - flexion of the hip

Question 13

Give the myotome of L3

Answer 13

Quadricpes femoris - extension of the knee (knee jerk)

Question 14

Give the myotome of L4

Answer 14

Tibialis anterior and posterior - inversion of the foot

Question 15

Give the myotome of L5

Answer 15

EHL and peroneal muscles - extension of great toe and eversion of the foot

Question 16

Give the myotome of S1

Answer 16

Gastrocnemius - plantar flexion of the foot (ankle jerk)

Question 17

Give the myotome of S2

Answer 17

Small muscles of the foot