Spinal nerve root
T2
Muscle contributions
Reported motor contributions, grouped by region. Muscles commonly receive more than one root; these groups are not a serial nerve pathway.
Thoracic wall
- External intercostal (space 2)
- Internal intercostal (space 2)
- Innermost intercostal (space 2, where present)
- Levatores costarum (corresponding fascicles)
Anterior thoracic wall
- Transversus thoracis
Posterior thoracic wall
- Serratus posterior superior
Source-dependent contributions
- Subcostales receive corresponding intercostal-nerve supply where slips are present; individual slip assignments vary.
Intrinsic back muscles receive segmental dorsal-ramus supply. Individual root-to-fascicle contributions vary.