A.Ventral rami of 1st to 4th pairs of cervical spinal nerves
B.Dorsalrami of 1st to 4th pairs of cervical spinal nerves
C.Ventral rami of 4th to 8th pairs of cervical spinal nerves
D.Dorsal rami of 4th to 8th pairs of cervical spinal nerves
A.Ventral rami of 1st to 4th pairs of cervical spinal nerves
B.Dorsalrami of 1st to 4th pairs of cervical spinal nerves
C.Ventral rami of 4th to 8th pairs of cervical spinal nerves
D.Dorsal rami of 4th to 8th pairs of cervical spinal nerves