Atlas and text-book of topographic and applied anatomy . —about mm. thick—have numerous fine pores for the passage of the per-iosteal vessels. There is no sharp line of division between either table and the enclosed diploe,which is filled with red bone-marrow. Fractures of the inner table, such as the so-called stellatefractures, or splinterings of the inner table without concomitant injury of the outer table are notdue to a greater brittleness of the inner table, but to its thinness and to its shorter radius ofcurvature. The venous blood of the bone collects in the diploic veins which are
Atlas and text-book of topographic and applied anatomy . —about mm. thick—have numerous fine pores for the passage of the per-iosteal vessels. There is no sharp line of division between either table and the enclosed diploe,which is filled with red bone-marrow. Fractures of the inner table, such as the so-called stellatefractures, or splinterings of the inner table without concomitant injury of the outer table are notdue to a greater brittleness of the inner table, but to its thinness and to its shorter radius ofcurvature. The venous blood of the bone collects in the diploic veins which are situated in canals in thediploe. The diploic veins are divided into the frontal, anterior temporal, posterior temporal, andoccipital. They are subject to considerable variation, and hemorrhage from them after injury Fig. sphenoid r~— rior branch of the Jt mi. Jdle meningeal K artery ?&*; Squa mous portion of K-fj, temporal bone B£ Post. :rior branch of the BL meningeal artery WC~ Zygomatic process of 1 the temporal bone !&.-;.;.. Supra .-orbital ner ™ Orbital plate of I boneNasal boneAnterior ethmoid: he frontil foramc LachrOs pilostei anum of theior ethmoid. Mhmoic Optic foramen Left i ££u3 foramen THE CRANIUM. 9 is not of great importance. In opening the skull with the chisel or in trephining no attempt ismade to avoid them. At the thin places in the cranium, such as the squamous portion of the temporal bone, thebottom of the posterior cranial fossa, etc., the diploe is absent and the two tables are in contactwith each other. The diploe may also undergo more or less atrophy in the aged. In the frontal bone the two tables become widely separated on either side of the glabellaenclosing the frontal sinuses, which, next to the maxillary sinuses, are the largest of the accessoryair-cavities in communication with the nose (see Fig. 3). Between the inner table and the an-terior wall of the frontal sinus there is still a thin layer of diploic tissue, while the inner
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