. Cunningham's Text-book of anatomy. Anatomy. 300 THE ARTICULATIONS OE Fig. 288.— Section through the occipito-sphenoid syn- chondrosis. ossification, and thus the plane of articulation becomes obliterated, so that direct structural continuity between the osseous segments takes place. The primary features common to all synarthroses are—(a) continuous and direct union of the opposing surfaces; (&) no joint cavity; (c) no movement. Sutura.—This form of synarthrosis is found only in connexion with the bones of the skull. In a large number of cases the bones which articulate by suture
. Cunningham's Text-book of anatomy. Anatomy. 300 THE ARTICULATIONS OE Fig. 288.— Section through the occipito-sphenoid syn- chondrosis. ossification, and thus the plane of articulation becomes obliterated, so that direct structural continuity between the osseous segments takes place. The primary features common to all synarthroses are—(a) continuous and direct union of the opposing surfaces; (&) no joint cavity; (c) no movement. Sutura.—This form of synarthrosis is found only in connexion with the bones of the skull. In a large number of cases the bones which articulate by suture present irregular interlocking margins, between which there is the interposed fibrous membrane to which refer- ence has already been made. "When these interlocking margins present well-defined projections they are said to form a sutura vera (true suture); on the other hand, when the opposed surfaces present ill-defined projections, or even flat areas, they are described as sutura notha (false suture). In each of these subdivisions the particular characters of the articulating margins are utilised in framing additional descriptive terms. Thus true sutures may possess interlocking margins whose projections are tooth-like (sutura dentata), in the interparietal suture; saw-like (sutura serrata) (Fig. 289), in the interfrontal suture; ridge-like, or comparable to the parallel ridges on the welt of a boot (sutura limbosa). Similarly false sutures may articulate by margins which are scale- like (sutura squamosa), in the squamoso-parietal suture; or by rough opposed surfaces, sutura harmonia, in the suture between the palatine processes of the maxillary bones. There is one variety of synarthrosis which, in the adult, can scarcely be called a suture, although the differences are of minor importance, viz., schindylesis, which is an articulation between the edge of a plate- like bone, such as the rostrum of the sphenoid, and the cleft in another, such as th
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