. Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine . ocytes. The inflammation maybecome suppurative or gangrenous. If severe, it destroys the nervefibres; but oftenest the axis cylinders are not destroyed, and re-covery takes place. Chronic interstitial neuritis and perineuritisare accompanied with hyperplasia of the connective tissue, compres-sion and more or less destruction of the nerve (Fig. 44). It may 80 DISEASES OF THE NERVOUS SYSTEM. ascend or descend, and it is called, accordingly, ascending, descend-ing, or migrating neuritis. It
. Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine . ocytes. The inflammation maybecome suppurative or gangrenous. If severe, it destroys the nervefibres; but oftenest the axis cylinders are not destroyed, and re-covery takes place. Chronic interstitial neuritis and perineuritisare accompanied with hyperplasia of the connective tissue, compres-sion and more or less destruction of the nerve (Fig. 44). It may 80 DISEASES OF THE NERVOUS SYSTEM. ascend or descend, and it is called, accordingly, ascending, descend-ing, or migrating neuritis. It may affect only certain segments ofthe nerve, when it is called segmental neuritis or disseminated neu-ritis. Tuberculous and syphilitic neuritis are of the chronic inter-stitial or diffuse type. These latter forms rarely involve peripheralnerves, but rather the intracranial parts of the cranial nerves andthe spiual nerve roots in meningeal tuberculosis or syphilis. Asyphilitic peripheral multiple neuritis is, however, thought to occursometimes. Leprous neuritis is a very typical form of proliferating. Fig. 44.—Acute Infectious Neuritis, showing hemorrhage, connective-tissue prolifera-tion, diseased nerve fibres, and obliterated vessel (Rosenheim). chronic perineuritis. Cancerous neuritis sometimes occurs, and itis of the diffuse type, though sometimes an actual cancerous processinvades the nerve. The second type is called degenerative neuritis and this processof degeneration is the dominant one, so that the changes can be bestdescribed under the head of degeneration of nerves: Degeneration of Nerves.—This is a process in which thenerve fibres gradually die; the myelin sheath and axis cylinderdisappear, leaving only a strand of connective tissue. Nerve Degeneration.—There are three forms of nerve degenera-tion: 1. Primary, 2. Secondary; 3. Neuritic or toxic. GENERAL DISEASES OF THE PERIPHERAL NERVES. 81 1. The primary form is rare, slight in extent, and of littleclinical
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