Nervous and mental diseases . f theposterior cord tracts, because of the anatomical absence of the neurilemmaat the point where the sensory root fibers enter the cord. They findthis to be the initial point for the degenerative process. Morbid Anatomy.—In this section it is purposed to take up themorbid anatomy of the nervous apparatus in tabes dorsalis. The morbidanatomy of the trophic lesions in the bones, joints, and soft structureswill be described respectively with their clinical features. As the diseaseis essentially marked by ascending degenerations, it is well to commenceat the peripher
Nervous and mental diseases . f theposterior cord tracts, because of the anatomical absence of the neurilemmaat the point where the sensory root fibers enter the cord. They findthis to be the initial point for the degenerative process. Morbid Anatomy.—In this section it is purposed to take up themorbid anatomy of the nervous apparatus in tabes dorsalis. The morbidanatomy of the trophic lesions in the bones, joints, and soft structureswill be described respectively with their clinical features. As the diseaseis essentially marked by ascending degenerations, it is well to commenceat the periphery. 1 Brain, Winter, 1904. DISEASES OF THE WHITE MATTER OF THE CORD. 425 The spinal nerves are usually found to present a degeneration whichis greatest at the periphery and most marked in, if not entirely confinedto, the sensory fibers for the skin, muscles, and joints. The trophiccenters for these fibers are in the posterior root-ganglion in part, but itseems probable that there are also superficial peripheral trophic cells. Fig. 180.—Sections of the cord in an early case of tabes. 1, Lumbar region ; 2, dorsal region; 3, cervical region (Marie). for at least a few of them. The muscle spindles which undoubtedlyhave a sensory function are constantly found degenerated. By somewriters these nerve-changes are denominated a neuritis, but histologicallythe changes conform to a Wallerian degeneration. The spinal nerve-roots
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