. Anatomy, descriptive and applied. Anatomy. THE SPHENOID BOXE 95 process {processus vagiiialis), which runs inward on the under surface of the body of the sphenoid nearly to tlie rostrum. In the groove between the two in the articu- lated skull are seen the alae of the vomer. On the under surface of the vaginal process is a groove (svlciis pterygopalatimos), which in the articulated skull is con- verted into the pterygopalatal canal by union with the sphenoidal process of the palate bone. At the junction of the vaginal process and the inner plate is the pterygoid tubercle, just above which is
. Anatomy, descriptive and applied. Anatomy. THE SPHENOID BOXE 95 process {processus vagiiialis), which runs inward on the under surface of the body of the sphenoid nearly to tlie rostrum. In the groove between the two in the articu- lated skull are seen the alae of the vomer. On the under surface of the vaginal process is a groove (svlciis pterygopalatimos), which in the articulated skull is con- verted into the pterygopalatal canal by union with the sphenoidal process of the palate bone. At the junction of the vaginal process and the inner plate is the pterygoid tubercle, just above which is the posterior opening of the Mdian canal. The anterior surface of the pterygoid process is quite broad at its base, and forms the chief part of the posterior wall of the sphenomaxillary fossa. The Sphenoidal Turbinated Processes (conchae sphenoidales).—The sphe- noidal turbinated processes are two thin curved plates of bone, which exist as separate pieces until puberty, and occasionally are not joined to the sphenoid in the adult. They are situated at the anterior part of the body of the sphe- noid, an aperture (aperiura sinus sjjhcnoidalis) of \ariable size being left in the anterior wall of each, through which the sphenoidal sinuses open into the nasal fossse. They are irregular in form and taper to a point behind, being broader and thinner in front. Their upper surface, which looks toward the cavity of the sinus, is concave; their under surface convex. Each bone articulates in front with the ethmoid, externally with the palate; its pointed posterior extremity is placed above the vomer, and is received between the root of the pterygoid process on the outer side and the rostrum of the sphenoid on the inner.' Development.—Up to about the eighth month of fetal life the sphenoid bone consists of two distinct parts—a posterior or postsphenoid part, which comprises the sella turcica, the greater wings, and the pterygoid processes; and an anterior or presphenoid part, to whic
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
