Development and anatomy of the nasal accessory sinuses in man; observations based on two hundred and ninety lateral nasal walls, showing the various stages and types of development of the accessory sinus areas from the sixtieth day of fetal life to advanced maturity . of the mesoderm in its central portion, followedby transformation into cartilage (Fig. 9). The agger nasiwith the processus uncinatus together form the ErsteHauptmuschel of Killian. However, in this work it willnot be listed as one of the conchse, for, although comparativeanatomy shows these structures to be the homologue of thei
Development and anatomy of the nasal accessory sinuses in man; observations based on two hundred and ninety lateral nasal walls, showing the various stages and types of development of the accessory sinus areas from the sixtieth day of fetal life to advanced maturity . of the mesoderm in its central portion, followedby transformation into cartilage (Fig. 9). The agger nasiwith the processus uncinatus together form the ErsteHauptmuschel of Killian. However, in this work it willnot be listed as one of the conchse, for, although comparativeanatomy shows these structures to be the homologue of theinferior olfactory concha as found in lower mammalia, yetthe form and position which they have assumed in the humantype are such that we deem it best not to consider themas forming one of the true nasal conchse. Shortly after the appearance of the processus uncinatusthere is seen, just inferior to the attachment of the middleportion of the concha media, another projection, which alsodevelops from the lateral nasal wall, with its free borderfacing in an antero-inferior and slightly medial direction(Fig. 9). This fold is the early bulla ethmoidalis, whichdevelops from the lateral ethmoidal mass as one of its sec-ondary folds. EMBRYOLOGIC CONSIDERATIONS 27 ,^^f:^j. Fig. 5.—Diagram Drawn From a Coronal Section, mm. Posterior toTHAT Shown in Fig. 4. (Series A, No. 1, slide 10, section 6. X 16?3.), Cartilage eapsulae nasalis; , concha superior (note that at this stage of development there is no cartilage in this concha); , concha media; , concha inferior. ,\ Proc. urv
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Keywords: ., boo, bookcentury1900, booksubjectembryologyhuman, booksubjectnose
