Archive image from page 660 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 NERVOUS CENTRES. (HUMAN ANATOMY. GRE\ NERVOUS MATTER). 647 in size as they approach and enter the grey matter. Of' the grey nervous matter.—The grey ner- vous matter differs very materially in its' ana- tomical characters from the white. Its ele- ments are vesicles or cells, with nuclei and nucleoli. Although this vesicular or cell form is universally prevalent, the cells present much diversity of shape, size, and colour in different centres or even in the sam
Archive image from page 660 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 NERVOUS CENTRES. (HUMAN ANATOMY. GRE\ NERVOUS MATTER). 647 in size as they approach and enter the grey matter. Of' the grey nervous matter.—The grey ner- vous matter differs very materially in its' ana- tomical characters from the white. Its ele- ments are vesicles or cells, with nuclei and nucleoli. Although this vesicular or cell form is universally prevalent, the cells present much diversity of shape, size, and colour in different centres or even in the same centre, which ap- parently have reference to some peculiarity of function. The most prevalent form is that of a globular vesicle, composed of a very deli- cate transparent membrane. Within this mem- brane is contained a soft minutely granular sub- stance, which forms the principal mass of the body, parenchymmaxse (Valentin). The grey colour of the vesicle, which becomes very ma- nifest when a number of them is congregated together, is dependent on this granular matter. (See Jig. 371, a, b, c.) When the vesicle bursts and its substance is broken up, the granular matter is diffused, and confuses and darkens the specimen under examination. Sometimes the outer vesicle is removed, the contained granular matter retaining the globular form. Within the external vesicle (a, Jig. 371) there Fig. 371 Nerve vesicles from the Gasserian ganglion of the human subject. a, a globular vesicle with defined border; b, its nucleus; c, its nucleolus; d, caudate vesicle; e, elongated vesicle with two groups of pigment particles ; /, vesicle surrounded by its sheath or capsule of nucleated particles; g, the same, the sheath only being in focus. is another much smaller and adherent to a part of its wall, so as to be quite out of the centre of the containing vesicle. This is the nucleus (b, Jig. 371). Its structure is ap- parently of the same nature as that of the ex- ternal vesicle. The nucleu
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