DOI Page / Citation link:
https://doi.org/10.11588/diglit.6271#0036
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niuni ossify. They are all more strongly marked on the
external surface of the cranium. Towards old age bony
matter is often deposited between the bones, so as to
cause the sutures to disappear ; and sometimes, though
seldom, at a very early period. The author haa in his
collection the cranium of an African negro, who died
before the age of twenty-eight, in which there is no
vestige of the true sutures ; and instances are related Of
the sagittal and coronal sutures being entirely oblite-
rated in children of only eight years of age.
Besides these sutures, there are several prom'mencesvpon the
m>per part of the cranium ; two in the frontal bone, one im-
mediately over each eye, between it and the suture ; one in the
middle of each parietal bone ; and one in the middle of the oc-
cipital : these point out the centre of ossification of those bones.
Upon the internal surface of the upper part of the cranium
there are a number of grooves, in aH arborescent form ; these
are made by the spinous artery of the dura mater. The su-
tures are here seen in the form of a line, not dove-tailed, and
the whole surface appears jnore polished than the external.
The bones forming the upper part of the skull, or, as it is
sometimes called, the ralcuria, are composed of an external
and an internal table, which are of a compact structure, and
of a spongy intervening substance, called the meditullium, or
diploe.
The internal surface of the basis of the cranium, is divided
naturally into eight considerable depressions, adapted to the
lobes of the brain and cerebellum. The two unterinr are im-
mediately over the orbits, and are separated from each othe1'
by an obvious eminence, above the root of the nose, called
crista galli. Immediately before this eminence is a small hole
called the foramen cacum ; and on each side of it arc a number
of perforations, which traiismit the olfactory nerves into the
nose ; they are called the foramina cribrosa. Fassiag buck-
4
niuni ossify. They are all more strongly marked on the
external surface of the cranium. Towards old age bony
matter is often deposited between the bones, so as to
cause the sutures to disappear ; and sometimes, though
seldom, at a very early period. The author haa in his
collection the cranium of an African negro, who died
before the age of twenty-eight, in which there is no
vestige of the true sutures ; and instances are related Of
the sagittal and coronal sutures being entirely oblite-
rated in children of only eight years of age.
Besides these sutures, there are several prom'mencesvpon the
m>per part of the cranium ; two in the frontal bone, one im-
mediately over each eye, between it and the suture ; one in the
middle of each parietal bone ; and one in the middle of the oc-
cipital : these point out the centre of ossification of those bones.
Upon the internal surface of the upper part of the cranium
there are a number of grooves, in aH arborescent form ; these
are made by the spinous artery of the dura mater. The su-
tures are here seen in the form of a line, not dove-tailed, and
the whole surface appears jnore polished than the external.
The bones forming the upper part of the skull, or, as it is
sometimes called, the ralcuria, are composed of an external
and an internal table, which are of a compact structure, and
of a spongy intervening substance, called the meditullium, or
diploe.
The internal surface of the basis of the cranium, is divided
naturally into eight considerable depressions, adapted to the
lobes of the brain and cerebellum. The two unterinr are im-
mediately over the orbits, and are separated from each othe1'
by an obvious eminence, above the root of the nose, called
crista galli. Immediately before this eminence is a small hole
called the foramen cacum ; and on each side of it arc a number
of perforations, which traiismit the olfactory nerves into the
nose ; they are called the foramina cribrosa. Fassiag buck-
4