A spinal nerve ramus is a branch formed after a spinal nerve has been assembled from its dorsal root and ventral root. Both posterior and anterior spinal nerve rami carry mixed sensory and motor fibres. Posterior branches principally supply the back; anterior branches supply the anterolateral trunk and, through nerve networks, the limbs.[ref]
A root and a ramus therefore describe different positions in the branching pathway. Fibres have already mixed before the spinal nerve rami separate. Many anterior branches contribute to a nerve plexus, redistributing axons from several spinal levels into named peripheral nerves. The branch points route existing fibres rather than forming new synapses.

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  1. Spinal nerve
  2. Peripheral nervous system
  3. Nervous system
  4. Neuroscience
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