Synarthroses (immovable articulations).Synarthroses include all
those articulations in which the surfaces of the bones are in
almost direct contact, fastened together by intervening
connective tissue or hyaline cartilage, and in which there is no
appreciable motion, as in the joints between the bones of the
skull, excepting those of the mandible. There are four varieties
of synarthrosis: sutura, schindylesis, gomphosis, and
synchondrosis. Sutura.Sutura is that form of articulation where
the contiguous margins of the bones are united by a thin layer
of fibrous tissue; it is met with only in the skull (Fig. 296).
When the margins of the bones are connected by a series of
processes, and indentations interlocked together, the
articulation is termed a true suture (sutura vera); and of this
there are three varieties: sutura dentata, serrata, and limbosa.
The margins of the bones are not in direct contact, being
separated by a thin layer of fibrous tissue, continuous
externally with the pericranium, internally with