general myotomes

Question 1

Diaphragm

Answer 1

(C3, C4, C5 keep the diaphragm alive”) - Book points just to C3. Phrenic nerve is C3,c4,c5.

Vertebrae level: C2–C4 vertebral levels in the spinal canal

Question 2

Trapezius

Answer 2

Motor: Spinal accessory nerve XI and Sensory/Proprioception - C3 C4 - Book has it at C3 for motor not sure why.
Vertebrae level C2-C4.

Question 3

deltoid (axillary nerve) and biceps brachii (musculocutaneous nerve)

Answer 3

C5 (and partially C6) - Vertebrae level C4, c5

Question 4

Wrist extensors

Answer 4

Myotome = C6 - (receive contributions from multiple cervical roots (usually C5–C7) - Vertebrae level around c5.

Question 5

Triceps

Answer 5

(the “C7 myotome”) Vertebrae level c6.

Question 6

Hand intrinsics

Answer 6

The ulnar nerve and the median nerve from the lower trunk of brachial plexus
C8-T1
from vertebrae level T1-T2.

Question 7

Intercostals

Answer 7

ventral rami of T3–T6 become intercostal nerves

Question 8

Abdominals

Answer 8

t7-T12

Question 9

Hip and leg muscles

Answer 9

L3-S2

Question 10

Foot muscles

Answer 10

L5-S2

Question 11

Bowl and bladder

Answer 11

S4-s5