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50 ANATOMr.

A line in measurement is one-twelfth part of an inch. In describing
the development of bones, weeks and months refer to embryonic and
foetal life. •
An articulating surface is that portion of a bone where it joins
another.
A facet is a portion of an articular surface which is distinguished
from adjacent portions of the same surface by difference of its curva-
ture.

The Skull.
The skull is composed of twenty-two bones, exclusive of the six
otic (ear bones), the AV^ormian bones, and the teeth. These are united
by sutures and synchondroidal articulations, with the exception of the
Fig 14.

i.'O ^.^ Lie. %«

y^^

Occipitivl lione, outer surface.
inferior maxilla, which is a diarthroidal joint. The skull approaches
the spheroidal shape, flattened at the sides, broader posteriorly than
anteriorlv, and is supported upon the atlas, the first bone of the verte-
bral column. Anatomists divide the bones of the skull into two
groups—the cranial and the flicial. The cranial bones, M'hich encase