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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: Curr Opin Neurobiol. 2012 Mar 10;22(4):631–639. doi: 10.1016/j.conb.2012.02.010

Figure 1. Afferent termination patterns in the spinal dorsal horn.

Figure 1

Primary afferents are routinely categorized as Aβ (thickly myelinated), Aδ (thinly myelinated), and C (unmyelinated) fibers based on conduction velocity, and can be further divided according to their responsiveness to different modalities and intensities of stimulation. The spinal dorsal horn is divided into laminae (indicated along left margin). Different types of afferents terminate in different laminae. HTMR, high-threshold mechanoreceptor. LTMR, low-threshold mechanoreceptor. Modified from [45].