. The development of the chick; an introduction to embryology . Fig. 165. — Transverse section of the olfactory organ of achick embryo, of mm. head length. (After Cohn.)f., Line of fusion, e. n., External nasal process, i. n.,Internal nasal process. T. 1, T. 2, Intermediate and supe-rior turhinals. binal, as a solid cord of cells. This grows backwards in the nasalseptum and passes to the outer side and branches, subsequentl}^acquiring a lumen. 288 THE DEVELOPMENT OF THE CHICK III. Thk Dkvklopmkxt of tiik Ear The ear (levok)l>s trom two eiitif(>ly (littVreiit ])riinarv sources,viz.,th
. The development of the chick; an introduction to embryology . Fig. 165. — Transverse section of the olfactory organ of achick embryo, of mm. head length. (After Cohn.)f., Line of fusion, e. n., External nasal process, i. n.,Internal nasal process. T. 1, T. 2, Intermediate and supe-rior turhinals. binal, as a solid cord of cells. This grows backwards in the nasalseptum and passes to the outer side and branches, subsequentl}^acquiring a lumen. 288 THE DEVELOPMENT OF THE CHICK III. Thk Dkvklopmkxt of tiik Ear The ear (levok)l>s trom two eiitif(>ly (littVreiit ])riinarv sources,viz.,the otocvst,unci the hrst visceral or hyoniandibiilar cleft: Theformer furnishes the epithelium of the membranous lab3rinth; theentodermal pouch of the latter becomes the tynij)ano-eustachiancavity; and !)art of the external furrow forms the external audi-tory nu^atus; the tissue between the internal jiouch and the ex-ternal iurrow dc^velops into the tytn])ainnn. The mc^senchynie inthe neiiihboi-hood of each of tliese pi-imordia becomes modified, ^^ «m
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