File:Journal of anatomy (1867) (14761560866).jpg

Identifier: journalofanatomy51anatuoft (find matches)
Title: Journal of anatomy
Year: 1867 (1860s)
Authors: Anatomical Society of Great Britain and Ireland Anatomical Society of Great Britain and Ireland. Proceedings
Subjects: Anatomy
Publisher: Cambridge (Eng., etc.) University Press
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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side of that line. This fact would accountfor the restriction of the sinus to the pre-sphenoid during childhood, andwould offer an explanation for the frequent incomplete destruction of someof these fu.sion-barriers by the increased growth-activity of puberty. Wehope to show that there are often present in the sinus ridges, crests, orpartial septa itidicating the position of the lines of fusion between the areas The Internal Structure of the Sphenoidal Sinus 129 of bone formed from the nuclei of the pre-sphenoid, post-sphenoid, thelingula and gieat wing. When once the barrier between the pre- and post-sphenoid is penetrated,growth is rapid, so that the sinus which first penetrates has the advantageover that of the opposite side, and usurps some of the space which by rightshould belonir to its neiohbour. Sometimes, indeed, the sinus of one sidefails to break into the post-sphenoidal area, and the other sinus may thenoccupy three parts of the sphenoidal body. More commonly the struggle
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Fig. 3.—Sagittal; section of skull of pig, to show syn-arthrodial joint between pre- and post-sphenoid.(Specimen in R.C.S. Museum, London.) for the possession of the post-sphenoid results in the deviation of theposterior part of the main inter-sphenoidal septum to one or other side ofthe mid-line. If we examine the skull of a pig we gain some help towardsunderstanding the structure and development of the sphenoidal sinus.In the pig there is a synarthrodial joint between the pre-sphenoid and thepost-sphenoid. The sinus pushes back through this joint, but the openingmade is small, and even after the post-sphenoid has been excavated thereremain well-marked medial and lateral elements of the septum between thepre- and post-sphenoid. 130 Dr V. Zachary Cope Consideration of the mode of development will show that for the sinusto extend laterally to any appreciable extent it must break through eitherthe fusion-barrier between the body and great wing in front or thatbetween the body and ling

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