DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.6271#0045
( ™ )
which the lateral sinuses are situated. The internal sur-
face has also four considerable depressions, formed by the cru-
cial spine; the two superior contain the posterior lobes of
the brain, and the two inferior, the two lobes of the cere-
bellum.
Man being designed for an erect posture, the foramen
magnum occipitale is placed nearly in the middle of
the basis of the human cranium, at almost an equal
distance from the posterior part of the occiput, and the
anterior part of the lower jaw ; whereas in quadrupeds
it is nearer the back part of the occiput.
Connexion. The occipital bone is connected by the cunei-
form process to the sphsenoid bone, in the adult by synosto-
sis ; hence Professor Soemmering describes them as one bone,
es occipito-sphanoidale ; but in youth by synchondrosis ; with
the two parietal, and two temporal bones by the lambdoidal
suture ; with the first vertebrae of the neck by ginglymus, and
with the second by syndesmosis.
The use of the occipital bone is to constitute the poste-
rior and inferior part of the cranium ; to contain the posterior
lobes of the brain, the cerebellum, and medulla oblongata,
and to serve for the articulation of the head with the spine.
If we except the petrous portion of die temporal bone,
the occipital will he found much stronger tlian any
other bone of the head. The reason of tins, perhaps, is,
that it lias to defend the cerebellum, the least injury
of which proves fatal ; and perhaps, alio, because the
occipital hone is more liable to fracture, and less de-
fended than the other bones; for when we fall forward,
the hands naturally protect us ; and if on one side, the
shoulders greatly defend the head ; but when a. per-
son falls backward*, the hind part of the head comes
with considerable force against the earth.
The occipital bone, at birth, is formed of four portions,
joined together by cartilages:—-one large portion,
which forms the hinder part of the. head ; no trace ol
which the lateral sinuses are situated. The internal sur-
face has also four considerable depressions, formed by the cru-
cial spine; the two superior contain the posterior lobes of
the brain, and the two inferior, the two lobes of the cere-
bellum.
Man being designed for an erect posture, the foramen
magnum occipitale is placed nearly in the middle of
the basis of the human cranium, at almost an equal
distance from the posterior part of the occiput, and the
anterior part of the lower jaw ; whereas in quadrupeds
it is nearer the back part of the occiput.
Connexion. The occipital bone is connected by the cunei-
form process to the sphsenoid bone, in the adult by synosto-
sis ; hence Professor Soemmering describes them as one bone,
es occipito-sphanoidale ; but in youth by synchondrosis ; with
the two parietal, and two temporal bones by the lambdoidal
suture ; with the first vertebrae of the neck by ginglymus, and
with the second by syndesmosis.
The use of the occipital bone is to constitute the poste-
rior and inferior part of the cranium ; to contain the posterior
lobes of the brain, the cerebellum, and medulla oblongata,
and to serve for the articulation of the head with the spine.
If we except the petrous portion of die temporal bone,
the occipital will he found much stronger tlian any
other bone of the head. The reason of tins, perhaps, is,
that it lias to defend the cerebellum, the least injury
of which proves fatal ; and perhaps, alio, because the
occipital hone is more liable to fracture, and less de-
fended than the other bones; for when we fall forward,
the hands naturally protect us ; and if on one side, the
shoulders greatly defend the head ; but when a. per-
son falls backward*, the hind part of the head comes
with considerable force against the earth.
The occipital bone, at birth, is formed of four portions,
joined together by cartilages:—-one large portion,
which forms the hinder part of the. head ; no trace ol