. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 196 COMPARATIVE MORPHOLOGY OF FIG. 202.—Saction turbinals and the maxillo-turbinals (fig. 200), the purpose of these folds being to increase the amount of sensory surface, while the skeletal supports keep the folds from touching each other. With diminution of the powers of smell the folds are correspondingly reduced, even to a loss of the turbination of the bones concerned. The maxillo-turbinals and naso-turbinals arise from the lateral wall of the nasal cavity (the former as a distinct turbinal b
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. 196 COMPARATIVE MORPHOLOGY OF FIG. 202.—Saction turbinals and the maxillo-turbinals (fig. 200), the purpose of these folds being to increase the amount of sensory surface, while the skeletal supports keep the folds from touching each other. With diminution of the powers of smell the folds are correspondingly reduced, even to a loss of the turbination of the bones concerned. The maxillo-turbinals and naso-turbinals arise from the lateral wall of the nasal cavity (the former as a distinct turbinal bone), the ethmo- turbinals as outgrowths from the ethmoid bone, appearing first at the upper hinder part of the septal wall and extending to the lateral wall. The result is that the ethmo-turbinal tends to insinuate itself between the hinder ends of the other two (figs. 200, 201). Each of these may be subdivided, with corresponding subdivision of the epithelial covering, and in the case of the ethmo-turbinals the subdivisions may be of varying heights (fig. 202), the ecto- and ento- turbinals. The nasoturbinals often disappear in through the nasal cavity the adult, while the epithelium of the maxillo- of a new born dog, after u- i • i_ , v • Paulli, J-/F, entoturbi- turbinals is not sensory in character, this part nals; 1-5, first to fifth ec- of ^g nose bemcr apparentlv to warm and toturbmals. moisten the air in its passage to the lungs. The homologies of the various parts of the nasal labyrinth in dif- ferent amniotes are thus stated (Peter). I. Concha of the anterior epthelium: concha vestibuli (birds). II. Conchae of the primitive sensory epithelium: 1. Arising from the lateral wall (conchae laterales). A. Anterior: a. Primary, ventral: concha of reptiles; middle concha of birds; maxillo-turbinals of mammals. b. Secondary, dorsal: Upper or posterior of birds; naso- turbinals of mammals (? pseudoconch of crocodiles). B. Arising from the posterior part: conchae obtectae
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
