. Quain's Elements of anatomy. s is a surface on a somewhat higher level,continuous with the superior surfaces of the small wings, and having a slight pro- 44 THE BONES OF THE HEAD. jection forwards of its anterior border, which articulates with the cribriform plateof the ethmoid, and is called the ethmoidal sjnne. Behind the pituitary fossa is aprominent lamella, the clorswn sella, the posterior surface of which is slopedapwards and forwards in continuation of the basilar groove of the occipital angles of this lamella project over the fossa, and are called the posterior dinoid^proces
. Quain's Elements of anatomy. s is a surface on a somewhat higher level,continuous with the superior surfaces of the small wings, and having a slight pro- 44 THE BONES OF THE HEAD. jection forwards of its anterior border, which articulates with the cribriform plateof the ethmoid, and is called the ethmoidal sjnne. Behind the pituitary fossa is aprominent lamella, the clorswn sella, the posterior surface of which is slopedapwards and forwards in continuation of the basilar groove of the occipital angles of this lamella project over the fossa, and are called the posterior dinoid^processes. On each side of the body the surface descends obliquely to a considerablylower level than the fossa : it presents close to the margin of the fossa a superficialwinding groove directed from behind forwards, marking the course of the internalcarotid artery. Behind the commencement of the groove, and at the lower end ofthe lateral margin of the dorsum sellse is a compressed projection, the petrosal BODY SMALL WING GREAT WING. FOT ROTUNDUMPOST CLIN. OVALEFOR. SPINOSUM Fig. 44.—The sphenoid bone, from above. (Drawn by D. Gunn.) process of the splienoid, which fits against the apex of the petrous jjart of thetemporal bone ; and opposite to this, on the outer side of the groove, the moreslender tongue-like process termed KnguJa sphenoidalis projects backwards in theangle between the body and great wing. The posterior surface is united to the basilar process of the occipital bone, inearly life by cartilage, but in adult age by continuous bony substance. The anterior surface is marked in the middle line by. the sphenoidal crest, a thinprojecting edge which descends from the ethmoidal spine, and articulates with thevertical plate of the ethmoid. The oblong surface on each side of the crest isdivided into a mesial and a lateral part : the lateral part is irregularly excavated,and articulates with the lateral mass of the ethmoid and the orbital process of thepalate bone : t
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectanatomy
