Text-Book of Histology Including the Microscopic Technique

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...are frequent. The sections should be principally made vertically to the axis of the convolutions. (For embedding, see Microtome Technic.) No. 75.--Hypophysis Cerebri.--Treat like No. 80. No. 76.--Brain-sand, Aeen'ulus Cerebri.--Tease the epiphysis in a drop of salt solution. If much brain-sand is present, a gritty sound will be heard on teasing and the larger concretions can be perceived by the unaided eye. Examine with the low power, without a cover-glass (Fig. 1 14); the granules are not always round, but often oval and dentated; occasionally the irregularity of the surface is indistinct, because they are enveloped in concentrically-arranged connective-tissue fibers. Push aside the larger granules with a needle, cover a few of the smaller ones with a cover-glass and treat with 2 to 3 drops of hydrochloric acid (p. 48). Bubbles of gas develop and the sharp outlines of the granules disappear. For the application of the Cox-Golgi mixture see p. 41 and 200, remark. No. 77.--Corpuscula Amylacea.--Select the brains of elderly individuals. With a scalpel scrape the mesial surface--that directed toward the third ventricle--of the optic thalamus and spread the scrapings with a needle in a drop of salt solution; apply a cover-glass. The corpuscles when present are easily found, and are recognized by their bluish-green color and their stratification (Fig. 115,7). They must not be confused with drops of extruded myelin (/t), which are always clear and have a double contour. In addition there are found in such preparations numerous red blood-corpuscles, ependymal cells (d), medullated nervefibers varying in thickness, and ganglion-cells; the latter are very pale and often can only be detected by their pigmentation (/). Human brains, even though not absolutely fresh, a...