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At the time the article was created Jeffrey Cheng had no recorded disclosures.View Jeffrey Cheng's current disclosures
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The dorsal horn of the spinal cord is one of the grey longitudinal columns found within the spinal cord. It primarily acts as the termination of primary afferent fibers via the dorsal roots of the spinal nerves.
On transverse section of the spinal cord the spinal grey matter is described as being 'butterfly-shaped' or in an arrangement of the letter 'H'. The dorsal horns are bilateral structures which form the posterior projection of this shape. A thin fasciulus or tract (of Lissauer) separates the tip of the dorsal horn from the dorso-lateral surface of the spinal cord.
The dorsal horn consists of six neuronal cell layers (laminae) which receive various sensory fibers
- I: marginal zone
- II: substantia gelatinosa
- III + IV: nucleus proprius
- V: neck of the dorsal horn
- VI: base of the dorsal horn
Clarke's column is present at the base of the dorsal horn in close proximity to the dorsal white funiculus.
Laminae I-IV primarily receive main cutaneous receptive fibers while lamina V receives fine afferents from the skin, muscles and viscera. Lamina VI receives proprioceptive fibers and contributes to the pathway for the deep tendon reflex.