File:Quain's Elements of anatomy (1891) (14582313930).jpg

Identifier: quainselementsof21quai (find matches)
Title: Quain's Elements of anatomy
Year: 1891 (1890s)
Authors: Quain, Jones, 1796-1865 Sharpey-Schäfer, E. A. (Edward Albert), Sir, 1850-1935, ed Thane, George Dancer, 1850-1930, joint editor
Subjects: Anatomy
Publisher: London, Longmans, Green, and Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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ex directed downwards and back-wards, and are in the adult usually incorporated with the sphenoid, but as explained in the THE SPHENOID BOXE. 45 account of their development, were orig-inallj distinct. They are commonly united by earlier orstronger anchylosis with the ethmoid or palate bones, so as to come away, at least in part, witheither of these in disarticulation of the skull, and thus lay open the sphenoidal sinuses. A smallportion of these bones sometimes appears on the inner wall of tlie orbit, between the ethmoid,frontal, sphenoid, and palate bones (Cleland in Phil. Trans.. 1802). Each Jateral surface of the body is for the most part occupied by the attachmentsof the two wings, but at the fore part, below the root of the small wing, there is ?small free surface which bounds the sphenoidal fissure internally and forms the hind-most portion of the inner wall of the orbit (fig. GJ, p. 6(5). The small or orbital wings extend nearly horizontally outwards on a level with GREAT WING
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PTERYGOID PROCESS Fig. 45.—The sphenoid bone, from behind. (Drawn by D. Gunii.) the fore part of the superior surface of the body. The extremity of each is slenderand pointed, and comes very close to, but usually not into actual contact with, thegreat wing. The superior surface forms part of the anterior fossa of the base of thecranium ; the inferior overhangs the sphenoidal fissure and the back of the orbit.The anterior border, thin and serrated, articulates with the orbital plate of thefrontal bone. The posterior border is prominent and free, and forms the boundaryl>etween the anterior and middle cranial fossae, terminating internally in a smoothrounded projection, the anterior clinoid process. Between the anterior clinoid pro-cess and the olivary eminence is a semicircular notch in which the carotid grooveterminates; and in front of this is the optic foramen perforating the base of thewing. The great or temporal wings project outwards and upwards from the sides ofthe body. The

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