Plate 17.323 Spinal Cord
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Dog, Müller's fluid, Weigert's method, 3.75 x.
This is a section of the spinal cord showing the distribution of dorsal root collaterals. Note that the coarser, heavily myelinated collaterals are medially located. They are seen passing to the posterior horn, intermediate gray, and anterior horn. Many fibers of this bundle enter the posterior funiculus. Finer, poorly myelinated collaterals are more laterally located and are seen entering the substantia gelatinosa. Some heavily myelinated fibers also enter the substantia gelatinosa. The medial bundle is the larger of the two. Collaterals that pass directly to the anterior horn constitute components of monosynaptic reflex arc. Their number is relatively small since most of the collaterals to the anterior horn terminate on at least one interneuron before reaching the final efferent neuron. Note the bundle of motor fibers (axons of motor neurons) leaving the anterior horn to form the ventral roots.
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