Spinal nerve root
C5
Muscle contributions
Reported motor contributions, grouped by region. Muscles commonly receive more than one root; these groups are not a serial nerve pathway.
Neck and respiratory
- Longus colli
- Anterior scalene
- Middle scalene
- Posterior scalene
- Diaphragm
Shoulder and scapula
- Levator scapulae
- Rhomboid major
- Rhomboid minor
- Serratus anterior
- Subclavius
- Supraspinatus
- Infraspinatus
- Subscapularis
- Deltoid
- Teres minor
- Pectoralis major — clavicular part
Arm
- Biceps brachii
- Brachialis
- Coracobrachialis
Forearm
- Brachioradialis
- Supinator
Source-dependent contributions
- Teres major — C5–C6 in some references; UW gives C6–C7.
Other deep posterior neck muscles have segmental posterior-ramus supply; the reviewed references do not resolve every muscle or fascicle to an individual root.