Grey matter White matter (a) Anterior view showing spinal cord, associated nerves, and vertebrae. The dorsal and ventral roots arise medially as rootlets and join laterally to form the spinal nerve. Branches of intercostal nerve Lateral cutaneous Anterior cutaneous Dereal and ventral rootets of spinal nerve Sternum intercostal nerve Dersal reet ganglie Dorsal root Ventral root (b) Cross section of thorax showing the main roots and branches of a spinal nerve.

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