. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. occipital (O, Jig. 372) is behind it, the two temporal (T, jig. 370) are on its sides, and the two parietal (P, fig. 370) are above it. The sphenoid bone (from atpnv, cuneus, os sphenoidale; Germ. Sphenoidal-knochen, Keil- knochen) comprehends the quadrilateral mass which forms the centre of the frame-work, the anterior ribs which support the frontal and partly the lateral domes, and the depending pillars which form the boundaries of the face; it extends to each temple, is behind and in part forms the orbits and the nose
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. occipital (O, Jig. 372) is behind it, the two temporal (T, jig. 370) are on its sides, and the two parietal (P, fig. 370) are above it. The sphenoid bone (from atpnv, cuneus, os sphenoidale; Germ. Sphenoidal-knochen, Keil- knochen) comprehends the quadrilateral mass which forms the centre of the frame-work, the anterior ribs which support the frontal and partly the lateral domes, and the depending pillars which form the boundaries of the face; it extends to each temple, is behind and in part forms the orbits and the nose, and is also behind but in close connexion with the bones of the face. The central portion is called the body, and the diverging processes are named alae majores and alee minores. The body is of a quadrilateral figure, hollow and divided by a partition into two chambers (the sphenoidal cells, s, jig. 371), which open through the medium of the posterior ethmoidal cells into the superior iwatus of the nose. On its upper surface is a deep depression fephip- pii(in,!>ellu turcica, fossa pituitaris) for the lodge- ment of the pituitary gland. The posterior bor- der of this depression presents a crest, the corners of wiiich are slightly tumid, (posterior ephip- pial, or clinoidprocesses,) for the attachment of the tentorium, and this crest is prolonged down- wards and backwards under the name of the basi/ar process, to join the process of the same name of the occipital bone; on each side there is a depression (sulcus caroticus) for the reception of the internal carotid artery, and which also marks the situation of the cavernous sinus. OK its under surface may be seen, on the median line, the processes azi/gos (rostrum), which is wedged into the base of the vomer, and on each side of it a line indicating the articulation of the two plates of which the vomer is formed. Still more out- wardly there is a groove which is converted into a canal by the application against it of the in-
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