. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 708 NERVOUS SYSTEM. (MICROSCOPICAL ANATOMY OF THE NERVOUS CENTRES.) the direction of which is probably oblique or transverse, as considerable portions of them may be seen taking such a direction when a piece of grey matter, cut transversely, is exa- mined under the microscope. The grey matter of the cord contains caudate and spherical vesicles imbedded in their usual granular matrix. They are found in the horns as well as in the commissure. The caudate vesicles are most numerous, and distend in the anterior horn and at t
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 708 NERVOUS SYSTEM. (MICROSCOPICAL ANATOMY OF THE NERVOUS CENTRES.) the direction of which is probably oblique or transverse, as considerable portions of them may be seen taking such a direction when a piece of grey matter, cut transversely, is exa- mined under the microscope. The grey matter of the cord contains caudate and spherical vesicles imbedded in their usual granular matrix. They are found in the horns as well as in the commissure. The caudate vesicles are most numerous, and distend in the anterior horn and at the root of the posterior one. The remainder of the posterior horn and the gelatinous substance which is found at its posterior border, resemble very closely in struc- ture the grey matter of the cerebral convolu- tions. By examining thin transverse sections of the cord, carefully hardened by immersion in spirits, a good view of the relative disposition of the grey and fibrous substances may be ob- tained. Stilling has carried investigations of this kind to a great extent, and has published some beautiful plates, which are quite true to nature. Fig. 396 is copied from one of them. Fig. Transverse section of human spinal cord, close to the third and fourth cervical nerves. Magnified ten dia- meters. (From Stilling.) f, posterior columns; i i, gelatinous substance of the posterior horn ; k, posterior root; /, supposed anterior roots ; a, anterior fissure ; c, posterior fissure; b, grey commissure, in which a canal is contained, which, according to these writers, ex- tends through the length of the cord ; y, anterior horn of grey matter containing vesicles ; e, an- tero-lateral column, from k to a. It is impossible, however, to obtain any information from such examinations, except of the most general kind. On referring to the figure, the reader will perceive several lines, of the same colour and appearance as the central mass, to radiate from each horn of the grey matter to
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