. A treatise on nervous and mental diseases, for students and practitioners of medicine. he core, and ends at its furtherextremity in a knob-like expansion, probably losing its medullarysheath Ixjforc it does so. The nervous network of the involuntary muscle has been traced 68 INTRODUCTORY, to the nucleoli of the muscle cell, but the subject has uot been suffi-ciently investigated to enable us to speak positively. The motor end-plates consist of a layer of granular matter filled withlarge, clear nuclei, each nucleus having one or more brigiit layer sitsupon a slight eminence made
. A treatise on nervous and mental diseases, for students and practitioners of medicine. he core, and ends at its furtherextremity in a knob-like expansion, probably losing its medullarysheath Ixjforc it does so. The nervous network of the involuntary muscle has been traced 68 INTRODUCTORY, to the nucleoli of the muscle cell, but the subject has uot been suffi-ciently investigated to enable us to speak positively. The motor end-plates consist of a layer of granular matter filled withlarge, clear nuclei, each nucleus having one or more brigiit layer sitsupon a slight eminence made by the upraised sarcolemmaor sheath of the muscle. The nerve fibre, as it approaches this gran-ular layer, loses its medullary sheath. The axis-cylinder then formsa flattened expansion, and terminates in the granular layer. There are probably many other modes of termination of nervefibres Mhicli future investigation will disclose, but these are sufficientto demonstrate that the nerve cell is in material communicationthrough the axis-cylinder Avith sensory and motor tissues. Fig. Drawing from a longitudinal section of a horses 360 diameters. In Fig. 48 is seen a transverse section of a horses nerve, to showthe way in which the different nerve fibres are grouped in a nerve,with their peri-neural and inter-neural connective tissue, and Fig. 49is a longitudinal section of the same horses nerve. THE BLOODVESSELS OF THE CEREBRUM, CEREBELLUM,PONS, AND MEDULLA OBLONGATA. Heubner and Duret have made most important researches into thevascular supply of the cerebrum, and have shown that there are twogreat sets of arterioles—one for the brain cortex, and the other forthe brain stem, as the intra-cranial organs below the cortex and thecentrum ovale are called, i. e., the basal ganglia and the sub-lying ponsand medulla oblongata. The arteries of the brain stem arise at rightangles from the larger branches of the circle of Willis, and, entering thecerebral substance, b
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