Plate 17.327 Medulla Oblongata
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peer Reviewed
Dog, Müller's fluid, Marchi's method, 12 x.
This cross section of the lower medulla is stained with the Marchi method, which selectively stains degenerated myelinated tracts black. In this section, black staining outlines the dorsal and ventral spinocerebellar tracts. These are fiber tracts that convey proprioceptive impulses to the cerebellum. They are concerned with unconscious proprioception. Three types of end organs are associated with proprioception: Pacinian corpuscles, muscle spindles, and Golgi tendon organs (see Plates 120, 121, 122, 124, and 125 ). These receptors detect movements of joints and changes in stretch and tension in muscles and tendons.
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