Practical anatomy: a manual of dissections / by Christopher Heath.

  • Christopher Heath
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Practical anatomy: a manual of dissections / by Christopher Heath. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    542/600 (page 532)
    a convex body, the fasciculus teres, which is white at the tipper part of the ventricle, but covered below by gray matter, and is the continuation of the fibres of the lateral tract and restiforra body of the medulla. There are four gangliform projections or nuclei on each side of the median groove in the floor of the ventricle. The upper one is for the sixth and facial nerves, and im- mediately below are some white lines (linese transversse), which run transversely from the median fissure and are connected with the auditory nerve. The lower nuclei are for the auditory, the eighth, and the ninth nerves. The lower extremity of the ventricle, which is bounded on each side by the enlarged extremities {•j^'^ocessus clavati) of the Posterior Pjn-amids of the spinal cord, has been called the calamus scriptorius, from its fancied resemblance to a pen, of which the linese transversse form the feathers [and the point the opening of the canal of Stilling]. By slicing vertically either hemisphere of the cerebellum, the appearance known as the arbor vitse (Fig. 242, 19) will be brought into view. This is due to the peculiar arrange- ment of white cerebral matter within the gray matter of the external laminae; and by careful slicing, an irregular gray body (coryus dentatum) will be seen in the centre of the white matter of each hemisphere. By making a trans- verse section of the medulla oblongata, a small corpus dentatum will also be seen in the olivary body of each side. When possible, the student, as soon as he has finished the above dissection, should procure another brain, in order that he may make various sections of it, and so more thoroughly understand the relations of the several parts. The most useful section is one made in the median plane (Fig. 242, p. 531), or a little to one side of it (Fig. 235, p. 517) by which most of the important parts will be exposed.