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Updated: June 24, 2025
Again, the cells are modified to form fibers, such as tendon, muscle, and nerve. Even such dense structures as bone, cartilage, and the teeth are formed from cells. Amoeboid Movement of a Human White Blood Corpuscle. In short, cells may be regarded as the histological units of animal structures; by the combination, association, and modification of these the body is built up.
The effect, then, of this earliest histological differentiation was to produce two different kinds of cells nutritive cells in the depression and locomotive cells on the surface outside. But this involved the severance of the two primary germinal layers a most important process.
Afterwards there are slight histological differentiations in its ectoderm, though the entoderm remains a single stratum of cells. We find the first differentiation of epithelial and stinging cells, or of muscular and neural cells, in the thick ectoderm of the hydra.
Accurate regional anatomy has rendered practicable the exploration of the most hidden parts of the organism, and the determination, during life, of morbid changes in them; anatomical and histological post-mortem investigations have supplied physicians with a clear basis upon which to rest the classification, of diseases, and with unerring tests of the accuracy or inaccuracy of their diagnoses.
First, it is generally agreed that boys of high-school age may profit by learning their own sexual structure by means of diagrams such as the one in Hall's "Sexual Hygiene." There is no harm, and also no gain, in minute description, especially histological. In dealing with boys and young men I have noticed that these and other scientific words have a great influence on their attitude.
In these affections the bones present no histological or chemical alterations, and the X-ray shadow does not differ from the normal.
There was also a botanical laboratory in which all of the botanical work of the institution was carried on. This did not involve any overlapping, but there was overlapping of the work of the zoölogical laboratory and that of the medical department, which had an anatomical laboratory, a histological laboratory, a pathological laboratory and a so-called hygienic laboratory.
It has been determined that it takes a louder and louder sound or a stronger and stronger electric shock to arouse a sleeper during the first two or three hours of slumber; after that period, the sleep becomes lighter and the required stimulus need be much less. The alternative theories which have been suggested to account for the onset of sleep may be classed as chemical and histological.
It did not dissect plants; it did not give chemical or histological analysis: but with bright and curious fancy, with the most ingenious diagrams and perfect drawings beautifully engraved by Burgess and Allen illustrated the mystery of growth in plants and the tender beauty of their form. Though this was not science, in strict terms it was a field of work which no one but Ruskin had cultivated.
Meantime, general acceptance being given the histological scheme of Gerlach, according to which the mass of the white substance of the brain is a mesh-work of intercellular fibrils, a proximal idea seemed attainable of the way in which the ganglionic activities are correlated, and, through association, built up, so to speak, into the higher mental processes.
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