. Journal of anatomy. ssified, according to the amountof their extension backwards, into («) pre-sphenoidal sinuses which areconfined to the pre-sphenoid ; (6) post-sphenoidal sinuses which extend backalmost to the clivus; and (c) sinuses of an intermediate size in which thepost-sphenoid is only slightly encroached upon. Of the 292 sinuses whichI examined, 155 were post-sphenoidal, 72 pre-sphenoidal, and 65 intermediatein type. It is quite clear that in a sinus confined to the pre-sphenoid there The Internal Structure of tlie Sphenoidal Sinus 131 are not likely to be any septa apart from the l
. Journal of anatomy. ssified, according to the amountof their extension backwards, into («) pre-sphenoidal sinuses which areconfined to the pre-sphenoid ; (6) post-sphenoidal sinuses which extend backalmost to the clivus; and (c) sinuses of an intermediate size in which thepost-sphenoid is only slightly encroached upon. Of the 292 sinuses whichI examined, 155 were post-sphenoidal, 72 pre-sphenoidal, and 65 intermediatein type. It is quite clear that in a sinus confined to the pre-sphenoid there The Internal Structure of tlie Sphenoidal Sinus 131 are not likely to be any septa apart from the lamella which separates theright sinus from the left, so that the following account of the internalstructure refers for the most part to the sinuses of the post-sphenoidal andintermediate types. We will consider the internal structure of the sinus under the followingheads:— Inter-sphenoidal septum. Transverse sphenoidal septum (trans-sphenoidal). Carotid buttress. Recesses from the main sinus. Bulges into the Fig. 5.—Sphenoidal sinus, showing tians-sphenoidal septum. 1. The pre-sphenoidal portion of the inter-sphenoidal septum is usuallymedian in position and antero-posterior in direction. It is not uncommon,however, for it to be slightl}^ to one or other side of the median line. Thepost-sphenoidal portion of the septum more commonly deviates from themiddle line, and sometimes bends almost at right angles to the anteriorpart so as to form the posterior wall of the opposite sinus. Quite acommon attachment posteriorly is to a point corresponding to the situationof the internal carotid artery, so that if the surgeon relied on the septumto guide him to the pituitary fossa he would frequently make a seriousmistake. 2. The trans-sphenoidal septum is the name best suited to express the 132 Dr V. Zachary Cope remaining portion of the barrier between the pre- and post-sphenoid. Ifthe element is small, the term trans-sphenoidal crest or ridge may be common position f
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
