. Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine . ts of the cranial nerve cells in these ganglia send off a single process whichdivides in a T-shaped fashion, the peripheral branch going out toform the sensory fibre, the central branch passing into the cord orbrain, to end in a terminal arborization which surrounds groups GENERAL DISEASES OF THE PERIPHERAL NERVES. 79 of sensory nerve cells. These sensory nerve cells in the cord are,therefore, not really nuclei of origin, but are terminal are no nuclei of origin f
. Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine . ts of the cranial nerve cells in these ganglia send off a single process whichdivides in a T-shaped fashion, the peripheral branch going out toform the sensory fibre, the central branch passing into the cord orbrain, to end in a terminal arborization which surrounds groups GENERAL DISEASES OF THE PERIPHERAL NERVES. 79 of sensory nerve cells. These sensory nerve cells in the cord are,therefore, not really nuclei of origin, but are terminal are no nuclei of origin for sensory nerves in the central ner-vous system. This changed point of view is of especial importancein our consideration of the anatomy of the cranial nerves (Fig. 43). General Pathology. Hyperemia and — Under the head of hypersemia andanaemia there occur types of nerve irritation, leading to differentforms of neuralgia, paraesthesia, and motor weakness or and anaemia are, however, secondary conditions and arerarely recognized clinically. It cannot always be determined. Fig. 43.—Showing the Cells of Origin op the Motor Nerves in the AnteriorHorns op the Spinal, Cord, and the Cells of Origin of the Sensory Nerves in thkPosterior Spinal Ganglia (Van Gehuchten). whether an irritated nerve is congested or anaemic, or whether thecentral part of the nervous system is not mainly at fault. Inflammation of Nerves—Neubitis.—There are two formsof neuritis: 1. Interstitial neuritis and perineuritis. 2. Diffuseneuritis with parenchymatous degeneration. The first form may beacute or chronic. In the first type there is hypersemia, with sometimes extrav-asation of blood. An exudation occurs into the fibrous frame workof the nerve, with migration of leucocytes. 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 neur
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