An atlas of the medulla and midbrain : a laboratory manual / by Florence R. Sabin ; edited by Henry McE. Knower.
- Florence R. Sabin
- Date:
- 1901
Licence: In copyright
Credit: An atlas of the medulla and midbrain : a laboratory manual / by Florence R. Sabin ; edited by Henry McE. Knower. Source: Wellcome Collection.
25/170 page 19
![Anatomy, Vol. mz, Pt.1. The Spinal Cord and Brain (Longmans, Green & Co., 1895). These figures are of the adult brain, and it will be noted that in them both the clava and the midbrain are relatively less prominent than in the model of the new-born baby’s brain, the fibres of the pons being non-medullated at birth. The dorsal view of the model (Plate mr), showing on the right side the floor of the fourth ventricle, on the left the structures beneath the floor, is to be compared with a similar view in Van Gehuchten’s Anatomy, page 62, and in Quain’s, page 48. In studying the nervous system by means of sections, only im- perfect ideas of the form of the different tracts can be obtained. A reconstruction, however, enables one to see an entire tract as a unit, after which its minute details can be studied. The plan of the present work is as follows: First, to call attention to each tract as it appears in cross-section, that is, to identify it; second, to describe the bundle in the reconstruction; third, to return to the sections and, using both series, to show how the points brought out in the model are shown in the sections. The illustrations show each tract both as a unit and cut in serial sections. The model and the sections should therefore be studied together. A sagittal series can also be used with the model. Two sets of serial sections are given, one transverse and the other horizontal. These can be related to the model as follows: Figure 52 represents an outline of the lateral view of the model, with scales on the margins representing the position of the sections of the two series. By joining opposite lines with a ruler or draw- ing similar parallel] lines any section can be located. The lines for the horizontal series must curve slightly to allow for the perspective of the drawing. By comparing Fig. 52 with other pictures of the model, sections can be related to each plate. Though, as has been said, a complex color system was necessary in building the model, in presenting it as a finished structure the color system has been made simple. All the fibres are shown in white and black, the nuclei of the gray substance in colors. Of these but three have been used—red for the motor nuclei, blue for the sensory and yellow for all other nuclei. In describing the model, the words proximal and distal have been used, proximal meaning toward the cerebrum, and distal away from it. Plan of the text. The location of sections in the model, Explanation of color system,](https://iiif.wellcomecollection.org/image/b32810167_0025.jp2/full/800%2C/0/default.jpg)
