. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 102 THE INTEGUMENTAL SKELETON OF THE IMAGO. Symphysis (Fig. 20, /) signifies the union of two sclerites by an inflected chitinous ridge between them. Syndesmosis (Fig. 20, 2) is the union of two sclerites by a soft, flexible portion of the cuticle. Syndesmoses are frequently imbricate; that is, one sclerite overlaps the other, protecting the sof
. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author;. Blowflies. 102 THE INTEGUMENTAL SKELETON OF THE IMAGO. Symphysis (Fig. 20, /) signifies the union of two sclerites by an inflected chitinous ridge between them. Syndesmosis (Fig. 20, 2) is the union of two sclerites by a soft, flexible portion of the cuticle. Syndesmoses are frequently imbricate; that is, one sclerite overlaps the other, protecting the soft integument between them from injury. Arthrosis.—An arthrosis is a kind of locked syndesmosis: two joints of an appendage are united by syndesmosis, but pro- cesses on the exterior of one fit into hollows on the exterior of the other. These may form a hinge, or peg joint, or, in some. FIG. 20.—The principal forms of Articulation (Diagrammatic) : /, symphysis ; 2, syndesmosis ; j, ball-and-socket-joint, from a section of the tarsus of the fly ; ^, gmglymus or hinge-joint ; 3, coxa, wilh a hemispherical articular surface, show- ing its relation to the line of attachment of the syndesmotic membrane. cases, a ball-and-socket (Fig. 20,^,5). A hinge joint, ginglymus (Fig. 20, 4), admits of flexion and extension in one plane only; a peg joint, of rotation only; and a ball-and-socket, amphi- arthrosis, admits of more or less free movement in any direction. There are other forms of articulation, but these do not need special terms for their description ; they are generally a modi- fication of one or other of the above. Sutures may be arranged in three classes, in accordance with their morphological value ; median, primary, and secon- dary sutures. Median Sutures are either dorsal or ventral, and are indicative of the bilateral symmetry of the developmental process. They represent the furrow between the two halves of the primitive. Please note that these images are extracted from sc
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