Myotomes & Peripheral Nerves Flashcards
What are the myotomes (i.e. groups of muscles) supplied by the cervical plexus? (3)
- neck postural muscles
- neck strap muscles
- diaphragm
What spinal nerve roots make up the cervical plexus?
C1-C4
What are the myotomes supplied by the brachial plexus? (2)
- upper limb muscles
- extrinsic back muscles
What spinal nerve roots make up the brachial plexus?
C5-T1
What are the myotomes supplied by the T2-L3 spinal nerves? (3)
- intrinsic back muscles
- intercostal muscles
- anterolateral abdominal wall muscles
What are the myotomes supplied by the lumbosacral plexus? (2)
- lower limb muscles
- perineal skeletal muscles
What spinal nerve roots make up the lumbrosacral plexus?
L1-S4
How many true myotomes does the area of motor innervation of the femoral nerve cross? and what are they?
- 3 myotomes
- L2, L3, L4
What muscle does shoulder abduction test and what myotome spinal root level?
- deltoid
- C5
What muscles does shoulder adduction test and what myotome spinal root level?
- pec major and latissimus dorsi
- C7
What muscle does elbow flexion test and what myotome spinal root levels?
- biceps brachii
- C5, C6
What muscle does elbow extension test and what myotome spinal root levels?
- triceps brachii
- C7 mostly and C8
What muscle does wrist flexion test and what myotome spinal root levels?
- carpal flexors
- C6 but mostly C7
What muscle does wrist extension test and what myotome spinal root levels?
- carpal extensors
- C6 mostly and C7
What muscles does finger flexion test and what myotome spinal root level?
- digit flexors
- C8
