. Anatomy, descriptive and applied. Anatomy. THE SPHENOID BONE 91 a broad, /-shaped groove, which lodges the internal carotid artery and the cavernous sinus. (See page 724 for other structures in the sinus.) It is called the cavernous groove {sulcus caroiicus). Along the outer margin of this groo\'e, at its posterior part, is a ridge of bone in the angle between the body and greater wing, called the lingula (lingula sphenoidalis). The posterior surface, quadrilateral in form, is joined to the basilar process of the occipital bone. During childhood these bones are separated by a layer of cartil
. Anatomy, descriptive and applied. Anatomy. THE SPHENOID BONE 91 a broad, /-shaped groove, which lodges the internal carotid artery and the cavernous sinus. (See page 724 for other structures in the sinus.) It is called the cavernous groove {sulcus caroiicus). Along the outer margin of this groo\'e, at its posterior part, is a ridge of bone in the angle between the body and greater wing, called the lingula (lingula sphenoidalis). The posterior surface, quadrilateral in form, is joined to the basilar process of the occipital bone. During childhood these bones are separated by a layer of cartilage; but later (between the eighteenth and twenty-fifth years) this becomes ossified from above downward, and the two bones then form one piece. The anterior surface (Fig. 57) presents, in the median line, a vertical ridge of bone, the ethmoidal crest {crista sphenoidalis), which articulates in front with the perpendicular plate of the ethmoid, forming part of the septum of the nose (Fig. 57). On either side of it are irregular openings leading into the sphenoidal sinuses (sinus sphenoidales), which are two large, irregular cavities of the hollowed out interior of the body of the sphenoid bone, and separated more or less completely from each other by a perpendicular bony septum {septum sinuuvi sphenoidalium). Occasionally they extend into the basilar process of the occipital nearly as far as the foramen magnum. Their form and size vary considerably; they are seldom. Flerygoid ridge Jiiternal pterygoid plate. process. symmetrical, and are often partially subdivided by irregular, osseous laminae. One or both sinuses may be absent. The septum is seldom quite vertical, being commonly bent to one or the other side. These sinuses do not exist in very young children, but appear, according to Laurent, in the seventh year. After once appearing they increase in size as age advances. They are partially closed, in front and below, by two thin, curved plates of bone, the sphenoidal
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
