Raphespinal tract

Raphespinal tract
Details
Identifiers
Latintractus raphespinales
Anatomical terminology

The raphespinal tract is a descending spinal cord tract located in the medulla oblongata. It consists of two tracts an anterior raphespinal tract, and a lateral raphespinal tract that mainly descend in the lateral funiculus. Fibers descend in the ventral portion of the lateral funiculus, mainly bilaterally to terminate in laminae I, II, and IV.

The tract emerges from three of the raphe nuclei, the magnus, obscurus, and pallidus. The fibers of the raphespinal tract are mainly serotonergic. When raphe nuclei are stimulated they release serotonin which modulates the transmission of pain.

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