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116 ANATOMY.
closely united through borders more or less uneven. This variety of
union is called a suture, and those occurring in the head may be sepa-
rated into four divisions—viz. those of the cranial vault, those of the
Fig. 60.

FtouIo I

Side View of Skull.
lateral portions of the cranium, those of the face, and those of the occi-
put (Fig. 00).
In des('ril)ing sutures the names of the bones forming them should
always be used.
SiTTUiiES OF THE Craxial Vai'I^t.—Tliosc between the bones
forming the cranial vault are three in number.
I. The I))fevparietaJ or Snrjiffal Suture is between the two parietal bones,
extending from the frontal bone to the .> bone. In childhood, and occasionally in adult life, ossification between
the two halves of the frontal bone is not ('onii)leted in the median line.
This causes the formation of a frontal sutiu'c, and a continuation of the
sagittal suture from the sujierior angle of the occipital bone posteriorly
to the nasal bones anteriorly. On either side of the suture posteriorly