. Cunningham's Text-book of anatomy. Anatomy. Fig. 166.—Development of the Mandible. As seen from the medial side ; B, from the lateral side C, showing accessory (metaplastic) cartilages (blue). (In A and B Meckel's cartilage is coloured blue.) before backwards, and bounds the mandibular notch posteriorly. To the medial side of the neck, immediately below the condyle, there is a little depression (fovea ptery- goidea) for the insertion of the external pterygoid muscle. The convex surface of the condyle is transversely elongated, and so disposed that its long axis is in- clined nearly horizonta
. Cunningham's Text-book of anatomy. Anatomy. Fig. 166.—Development of the Mandible. As seen from the medial side ; B, from the lateral side C, showing accessory (metaplastic) cartilages (blue). (In A and B Meckel's cartilage is coloured blue.) before backwards, and bounds the mandibular notch posteriorly. To the medial side of the neck, immediately below the condyle, there is a little depression (fovea ptery- goidea) for the insertion of the external pterygoid muscle. The convex surface of the condyle is transversely elongated, and so disposed that its long axis is in- clined nearly horizontally from within laterally and a little forwards. The con- vexity of the condyle is more marked in its antero- posterior than in its trans- verse diameter, and tends slightly to overhang the mandibular notch. The medial and lateral ends of the condyle terminate in tubercles which serve for the attachment of part of the capsular ligament of the joint. Ossification.—Its de- velopment is intimately as- sociated with Meckel's carti- lage, the cartilaginous bar of the first visceral or man- dibular arch. Meckel's car- tilages, of which there are two, are connected proxi- mally with the periotic capsule and cranial base. These distal ends meet but do not fuse in the region of the symphysis. Ossification takes place chiefly from membrane, in part from primordial cartilage (Meckel's cartilage), and also in part from accessory (metaplastic) cartilages, which have no connexion with Meckel's cartilage, but arise in the membrane from which the greater part of the bone is formed. Before ossifica- tion commences three structures are seen lying side by side in the mandibular arch of the embryo. These are, from within laterally, Meckel's cartilage, the inferior alveolar nerve which anteriorly divides into its two terminal branches, viz., the incisor and mental nerves, and a dense connective tissue which stretches from before backwards from close to the mid-line anteriorly to near the acoust
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
