DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.6271#0035
( 9 )
at the upper part and sides of the head ; two ossa temporuni,
placed below the parietal bones; one occipital, forming the
back part of the head ; one sphenoidal, placed in the middle
of the basis of the cranium; and one ethmoid, bone, situated
behind the root of the nose.
Upon viewing the superior part of a skull externally, several
zigzag lines are observable, called sutures :—that which ex-
tends from one temple across over the head to the other tem-
ple, is termed the coronal suture; it unites the frontal bone to
the two parietal:—that which proceeds from behind one ear
upwards, across to the other, is the occipital, or lambdoidal
suture; it unites the occipital bone to the two parietal:—and
the suture which extends upon the crown of the head, from
the lambdoidal to the coronal, uniting the two parietal bones,
is called the sagittal. These are sometimes termed the true
sutures, to distinguish them from two spurious or squamous,
which are found on each side of the cranium, extending from
the temple backwards, in the foim of an arch, and uniting
part of the temporal bone to the parietal. Besides these two
sutures, two other portions are to be noticed; the one be-
longing to the lambdoidal, the other to the squamous suture,
being, in fact, continuations of them : the one is called addi-
tamentum suturce squamosa, the other additamentinn sutures
lambdoidali. There are, sometimes, one or more triangular-
shaped bones observed in the course of some of the sutures t
these are called ossicula triquetra, triangularia, or Wormiana.
The chief use which arises from this partition of the cra-
nium into so many pieces, seems to be to facilitate the
ossification after birth, and to serve, in some measure,
to prevent the spreading of fractures from one bone
to another.
The formation of the sutures appears to be the effect of
the particular manner in which the bones of the cra^
b 5
at the upper part and sides of the head ; two ossa temporuni,
placed below the parietal bones; one occipital, forming the
back part of the head ; one sphenoidal, placed in the middle
of the basis of the cranium; and one ethmoid, bone, situated
behind the root of the nose.
Upon viewing the superior part of a skull externally, several
zigzag lines are observable, called sutures :—that which ex-
tends from one temple across over the head to the other tem-
ple, is termed the coronal suture; it unites the frontal bone to
the two parietal:—that which proceeds from behind one ear
upwards, across to the other, is the occipital, or lambdoidal
suture; it unites the occipital bone to the two parietal:—and
the suture which extends upon the crown of the head, from
the lambdoidal to the coronal, uniting the two parietal bones,
is called the sagittal. These are sometimes termed the true
sutures, to distinguish them from two spurious or squamous,
which are found on each side of the cranium, extending from
the temple backwards, in the foim of an arch, and uniting
part of the temporal bone to the parietal. Besides these two
sutures, two other portions are to be noticed; the one be-
longing to the lambdoidal, the other to the squamous suture,
being, in fact, continuations of them : the one is called addi-
tamentum suturce squamosa, the other additamentinn sutures
lambdoidali. There are, sometimes, one or more triangular-
shaped bones observed in the course of some of the sutures t
these are called ossicula triquetra, triangularia, or Wormiana.
The chief use which arises from this partition of the cra-
nium into so many pieces, seems to be to facilitate the
ossification after birth, and to serve, in some measure,
to prevent the spreading of fractures from one bone
to another.
The formation of the sutures appears to be the effect of
the particular manner in which the bones of the cra^
b 5