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Tab. LII. The Head of a Doe Dissected.
Fig. 1. The Brain of a Doe not opened.
- † a a a a. † b b. THE Brain is beautified with two Hemisphaeres † divided in the middle by a Fissure † in which is lodged a Duplicature of the Dura Mater, commonly called the Falciform Process.
- † c c c c. The serous vesicles † are placed about the Blood-vessels, lodged in the An∣fractus of the Brain, and are adorned with variety of Figures, some being orbicu∣lar, or Oval, others Triangular, or Pyramidal, and appear turgide, with a Li∣quor, much like Lympha, embodied with Particles of Air.
- † d d d. † e e. † f f f f. † g g g g. The Brain is first covered with a thick Coat (immediately encircling the Pia Mater) denominated the Dura Menynx † which being stripped off, the Pia Mater † appears (as being a fine vail immediately encompassing the Brain) shaded with fruitful Branches of Blood-vessels † which being conjoyned with nume∣rous Anfractus † do resemble a fine Landscip in the Pia Mater, when it is divested of the Dura Mater turned up, and placed at the Margent of the Brain.
- † ii. † l l. † k. Near the Origens of both Hemisphaeres are seated two Medullary Processes † (beau∣tified with a triangular Figure, adjoyning to the olfactory Nerves † inserted at last into the inward Coats of the Nostrils, beset with many Fibrils, the Instrument of Smelling. These Nerves are parted by a bony Intersepiment † called vulgarly The Bridge of the Nose.
- † m m. The Fissure severing one Hemisphaere from another, and taking its progress from the Origen to the termination of the Brain, is beset with a great company of small Glands †.
Fig. 2. The Brain of a Doe opened.
- † a a a a. † b b. Under the Falciform Process is lodged the Corpus callosum † which consisteth of many parts, separated from each other by two Fissures, the First † being much shorter then the other, divideth some part of the Corpus callosum into equal parts, which seem to be endued with a kind of Semilunary Figure, and their lower Angles adjoyn to the Origen of the Second Figure.
- † c c. The lower and longer Region of the Corpus callosum, is divided also into equal parts (by a longer Fissure †) which begin in acute, and end in more obtuse Cone.
- † d d d d. The Medullary part of this Brain, when opened, is bespecked with many streaks †, passing crosswise, which I humbly conceive are the nervous Fibrils of the Brain.
Fig. 3. The inward Recesses of the Brain of a Doe opened.
- † a a. † b b b b. Under the Corpus callosum, are lodged the Corpora striata †, the Apices of the Medulla oblongata, and have their origens endued with obtuse Cones, and their ter∣minations in more acute, contrary to those of a Humane Brain, which begin in more acute, and end in obtuse Cones. The Corpora striata in this Animal have two oblongue white productions † conjoyned to their terminations, which I have not seen in the Dissection of a Humane Brain.
- † c c c c. When the inward penetrals of the Brain of this Animal are laid open, on each side of the Corpora striata appear a white Medullary substance † enamelled with many white Striae, the fibrous Compage of the Brain.
- † d d. † e. In the most inward recesses of the Brain, are seated the Thalami † nervorum opti∣corum, which are parted from each other by a Fissure †, going almost the whole length of the Thalami nervorum opticorum, which being considered as conjoyned, do constitute a kind of Triangle.
- † f f. † g g. To the lower region of the Thalami nervorum opticorum, are adjacent the natiform Protuberancies †, which seem to be adorned with an orbicular Figure, and to the hinder part of the natiform Processes are the Testiforme † appendant, and seem to be of an oblongue shape, much different from the natiform Prominencies.