title: Development of ossification centres in the squamous portion of the occipital bone in man.
abstract: The development of ossification centres in the squamous portion of the human occipital bone is described on the basis of anomalies observed in a large series of skulls. The interparietal part develops from three pairs of centres in membrane--one pair for the lateral plates, one pair for the central piece, and the third pair representing the pre-interparietals. The supraoccipital part develops from five centres in cartilage--two centres for each lateral segment and a single centre for the central segment. The supraoccipital part extends from the posterior margin of the posterior condylar fossae to about 2 cm above the external occipital protuberance and about 0.4 cm above the superior nuchal line near the lambdoid suture.
mesh_terms: D002356:Cartilage; D006801:Humans; D008566:Membranes; D009777:Occipital Bone / Q000002:abnormalities* / Q000254:growth & development; D010012:Osteogenesis