[p. 146]
exception of a small portion of the uppermost and lowermost portions
of it, is like a sponge; and the bone has in it many juicy substances,
like caruncles; and if one will rub them with the fingers, some blood
will issue from them. There are also in the bone certain very slender
and hollow vessels full of blood. So it is with regard to hardness,
softness, and porosity.
Part 2
In respect to thickness and thinness; the thinnest and weakest part
of the whole head is the part about the bregma; and the bone there
has the smallest and thinnest covering of flesh upon it, and the largest
proportion of brain is situated in that region of the head. And hence
it happens that from similar or even smaller wounds and instruments,
when a person is wounded to the same or a less degree, the bone of
the head there is more contused, fractured, and depressed; and that
injuries there are more deadly and more difficult to cure; and it
is more difficult to save one's life in injuries there than in any
other part of the head; that from having sustained a similar or even
a less wound a man will die, and that, too, in a shorter space of
time than from a wound in any other part of the head. For the brain
about the bregma feels more quickly and strongly any mischief that
may occur to the flesh or the bone; for the brain about the bregma
is in largest quantity, and is covered by the thinnest bone and the
least flesh. Of the other portions, the weakest is that about the
temples; for it is the conjunction of the lower jaw with the cranium,
and there is motion there up and down as at a joint; and the organ
of hearing is near it; and further, a hollow and important vein runs
along the temple. But the whole bone of the head behind the vertex
and the ear is stronger than the whole anterior part, and the bone
itself has a larger and deeper covering of flesh upon it. And hence
it follows, that when exposed to the same or even greater injuries
from instruments of the same or greater size, the bone is less liable
to be fractured and depressed than elsewhere; and that in a fatal
accident the patient will live longer when the wound is in the posterior
part of the head than when elsewhere; and that pus takes longer time
to form and penetrate through the bone to the brain, owing to the
thickness of the bone; and moreover, as
