SCI Primer/Map Of The Spine

Segmental spinal Cord level and Function

Neck flexors
Neck extensors
C3, C4, C5
Supply diaphragm
C5, C6
Shoulder movement, raise arm (deltoid); flexion of elbow (biceps); C6 externally rotates the arm (supinates)
C6, C7, C8
Extends elbow and wrist (triceps and wrist extensors); pronates wrist
C7, C8, T1
Flexes wrist
C8, T1
Supply small muscles of the hand
lntercostals and trunk above the waist
Abdominal muscles
L1, L2, L3, L4
Thigh flexion
L2, L3, L4
Thigh adduction
L4, L5, S1
Thigh adduction
L5, S1, S2
Extension of leg at the hip (gluteus maximus)
L2, L3, L4
Extension of leg at the knee (quadriceps femoris)
L4, L5, S1, S2
Flexion of leg at the knee (hamstrings)
L4, L5, S1,
Dorsiflexion of foot (tibialis anterior)
L4, L5, S1,
Extension of toes
L5, S1, S2
Plantar flexion of foot
L5, S1, S2
Nexion of toes