arm abduction
C5 (deltoid)
digits flexion
C8 (flexor digitorum profundus)
elbow flexion
(C5) C6 (brachialis)
elbow extension
C6-8 (triceps brachii)
digit abduction/ adduction
T1 (dorsal interossei or plantar interossei)
hip flexion
L1/L2 (iliopsoas)
knee flexion
L5/S1/S2 (biceps femoris)
knee extension
L3/L4 (quadriceps, specifically vastus lateralis)
plantar flexion
S1/S2 (soleus)
adduction of toes
S2/S3 (plantar interossei)