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 . Fig. 7.—Diagram of Coronal Section Theough Nasal Area, to Section Shown in Fig. 6, Showing Relations of DevelopingConcha. Concha Superior Shows in its Central Area a Thickeningof the Mesoderm Which Later Becomes Cartilage. (Series A, No. 3,slide 7, section 3. X 16.) , Cartilage capsulte nasalis;

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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 . Fig. 7.—Diagram of Coronal Section Theough Nasal Area, to Section Shown in Fig. 6, Showing Relations of DevelopingConcha. Concha Superior Shows in its Central Area a Thickeningof the Mesoderm Which Later Becomes Cartilage. (Series A, No. 3,slide 7, section 3. X 16.) , Cartilage capsulte nasalis; , septum nasi; , conchainferior; , concha media; , concha superior. EMBRYOLOGIC CONSIDERATIONS 31 ,na. Sept. rva Sto. Fig. S.—Diagram Drawn From a Coronal Section Just Posterior toTHE Recessus Spheno-ethmoidalis, Showing the Primitive Sinus Sphe- NOIDALES WHICH DEVELOP AS INVAGINATIONS OP MuCOSA INTO THE POS-TERIOR Nasal Capsule. (Series A, No. 3 (sixty-five-day embryo), slide 10,section 10. X 16.), Sinus sphenoidales; , cartilage capsulas nasalis; , septum nasi. EMBRYOLOGIC CONSIDERATIONS 33 C. me a-

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Keywords: ., boo, bookcentury1900, booksubjectembryologyhuman, booksubjectnose