Atlas and text-book of topographic and applied anatomy . frontal sinuses exposed bychiseling away the outer table and the diploe. 20 TOPOGRAPHIC AND APPLIED ANATOMY. suture, it does not close until the second year, but may remain open for a much longer the birth of the child it is utilized by the obstetrician to determine the position of the The small or occipital jontanelle.—This has the shape of an obtuse-angled triangle andlies between the highest point of the occipital bone and the two parietal bones. During birththis fontanelle is usually closed, but the physician ca
Atlas and text-book of topographic and applied anatomy . frontal sinuses exposed bychiseling away the outer table and the diploe. 20 TOPOGRAPHIC AND APPLIED ANATOMY. suture, it does not close until the second year, but may remain open for a much longer the birth of the child it is utilized by the obstetrician to determine the position of the The small or occipital jontanelle.—This has the shape of an obtuse-angled triangle andlies between the highest point of the occipital bone and the two parietal bones. During birththis fontanelle is usually closed, but the physician can nevertheless recognize it by the fact that thecompression of the childs skull pushes the occipital bone beneath the edges of the parietal paired fontanelles, less important and usually closed at birth, are:i. The anterolateral jontanelle, between the frontal and parietal bones on the one side andthe great wing of the sphenoid and the squamous portion of the temporal on the other. of frontal sinusOpening of frontal .sinusAnterior wall of -. FlG. 4.—The right frontal sinus opened from in front. 2. The posterolateral jontanelle, between the mastoid portion of the temporal, the parietal,and the occipital bones. In the new-born a fissure extends from this fontanelle into the occipitalbone, which has been falsely attributed to the effect of traumatism, but which really marks theoriginal boundary between that portion of the occipital bone which is laid down in cartilage andthat which is laid down in membrane. The occurrence of supernumerary sutures and Wormian bones in the vault of the skull is ofconsiderable importance from a practical, and particularly from a medico-legal, standpoint, sincethey have been mistaken for fractures. Among these may be mentioned the frequently persistent THE CRANIUM. frontal suture, the numerous Wormian bones in the lambdoid suture, the so-called fontanelle-bones occurring in the paired and in the single fontanelles, and the interparietal
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