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The complexity of the laminae within the posterior horn and the cord pathways are illustrated in Figure 2.9, the detail of which is hard to remember. A single nerve root ganglion can contain around 100,000 neurones, each enshrouded by a modified Schwann cell. Two streams of axons, medial and lateral – the dorsal root afferents – synapse in various specific areas of the cord, to form the two main sensory pathways.

Figure 2.8 Sensory pathways to the cortex. (a) Posterior columns, (b) Spinothalamic tracts.

Source: Champney (2016).

Figure 2.9 Cord cross‐section: dorsal horn laminae, ascending & descending tracts.

Source: Fitzgerald 2010.