. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. OK. Fm. 196.\.—LATERAL VIEW OF THE NASAL CHAMBER IN THE HUMAN EMBRYO. 7, inferior (maxillary), //, middle, and ///, superior turbinal ; cr, base of skull; n, tip of nose; ox, Eustachian aperture ; pi, hard palate; t, super- numerary ridge (ectoturbinal) which occurs in the embryo. Mammals.—Correspond- ing to the more marked de- velopment of the facial por- tion of the skull, the nasal cavity of Mammals is propor- tionately much larger than in the forms described above, and consequently there is much more room for the ex-
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. OK. Fm. 196.\.—LATERAL VIEW OF THE NASAL CHAMBER IN THE HUMAN EMBRYO. 7, inferior (maxillary), //, middle, and ///, superior turbinal ; cr, base of skull; n, tip of nose; ox, Eustachian aperture ; pi, hard palate; t, super- numerary ridge (ectoturbinal) which occurs in the embryo. Mammals.—Correspond- ing to the more marked de- velopment of the facial por- tion of the skull, the nasal cavity of Mammals is propor- tionately much larger than in the forms described above, and consequently there is much more room for the ex- tension of the turbinals. These give rise to a spongy labyrinth, with cell-like com- partments lined by mucous membrane; and thus variously- shaped projections, supported partly by cartilage and partly by bone, are seen extending into the nasal cavity, and the olfactory organ reaches its highest development amongst Ver- tebrates. As in other ter- restrial forms, however, a posterior (upper) olfactory vcgion of considerable ver- tical extent, and an anterior (lower) respiratory region can be recognised, in each of which turbinals, with their skeletal supports, are developed (Figs. 196-198). In the olfactory region are found a series of true , \ -^ olfactory ridges, or scrolls, (\ \ ir'« ft \M situated in the posterior or median parts of each nasal chamber. The muc- ous membrane covering these contains olfactory cells and is supplied by the olfactory nerve; their skeletal supports become united later to the ethmoid. In the respiratory portion,. — OS. V. i. —r. ii. Fit;. 196u.—SAGITTAL SECTION THROUGH THE L.« NASAL AND BUCCAL CAVITIES OF THE HUMAN HEAD. /. inferior (maxillary), //, middle, and ///, superior turbinal ; lie, entrance to mouth ; lij, tongue; o-s, aperture of Eustachian tube; m', frontal sinus; *«.", sphenoidal sinus; , atlas vertebra; , axis Please note that these images are extracted from scanned page images that may have been dig
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