. Diseases of the nervous system . THE NERVE TISSUE (1) THE XERVE-CELLS I shall first state what we at present know of the structure of the nervoussubstance, and I shall begin with the nerve-cells. Recently the finer structuresof these tissues have been revealed to us as of such exceeding richness and pecu-liarity that, so far aswe know, they mayjustly be includedamong the most com-plicated cells of theorganism. Even the nucleus ofthe nerve-cell (Fig. 22,a) is characteristic oncomparison with thenuclei of other cells;first, by its size, par-ticularly in those largecells which are foundin the m
. Diseases of the nervous system . THE NERVE TISSUE (1) THE XERVE-CELLS I shall first state what we at present know of the structure of the nervoussubstance, and I shall begin with the nerve-cells. Recently the finer structuresof these tissues have been revealed to us as of such exceeding richness and pecu-liarity that, so far aswe know, they mayjustly be includedamong the most com-plicated cells of theorganism. Even the nucleus ofthe nerve-cell (Fig. 22,a) is characteristic oncomparison with thenuclei of other cells;first, by its size, par-ticularly in those largecells which are foundin the motor cortex ofthe brain, in the nucleiof the medulla oblon-gata, and in the ante-rior horns of the spinalcord. Here the germi-nal vesicle has the ap-pearance of an the nucleus of eventhe smallest nerve-cellsis always relativelylarge. The structure andthe tinctorial property of the nucleus is also typical. In the large cells it is separated from thebody of the cell by a sharp contour. On a light background, comparatively. Fig. 22.— Nerve-cell from the AnteriorSpinal Cord of a Rabbit, Hardened incohol. Neutral red staining. Horn of theformalin-al- 36 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM few but dark, more markedly refractive staining bodies are visible, amongwhich one, the nucleus (Fig. 22), is conspicuous among the large nerve-cells and resembles the germinal spot of the germinal vesicles. The reac-tion of the nucleus to certain stains is noteworthy. While cell nuclei havein common the property of taking up basic stains with their chromatinsubstance (and, therefore, are called nuclear stains), and while the nuclearcorpuscle (if present) frequently selects a stain which has an acid prop-erty, the reverse of this takes place in the nucleus of the nerve-cell: Itschromatin, scant in amount, shows an affinity for acid stains even whenused in neutral staining mixtures; for instance, in staining with triacid, withmethylene-blue, eosin, etc.; on the other hand, the nuclear
Size: 1494px × 1672px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervoussystem, bookye
