Anatomy of the Brain

oblongata base there exist two pyramidal bodies; likewise 6 posterior pairs of nerves arise from it, 47. A description of the vertebral arteries, 48, which are also more fully explained in the last chapter. Two figures, by which the structure of both the human and the sheep's brain removed from the cranium is represented, are explained, 47 to 52.

CHAP. IV. The parts of the cranium laid aside and certain contents are explained, p. 53.

The blood vessels passing through the sphenoid bone are described, 53. The pituitary gland is present in all animals; the same is either more fixed or more loose in its saddle; in some animals it is larger, in others smaller, 54, 55. Its regard to the rete mirabile, where it is present, 56. The carotid artery extends to the side of the pituitary gland, 57. This artery ascends obliquely in all animals, 58. Its position is peculiar in the horse, ibid. In most quadrupeds it has a rete mirabile joined to it, 59. The arteries of each side mutually communicate in all, 60. The reason for this communication, lest blood be carried to the brain more or less than is due, 61. The lateral sinuses, before they yield into the jugular veins, have a large, round cave joined to them, 62. Two figures are explained, by which the bases of both the human and the calf's cranium are represented, 63 to 65.