Archive image from page 198 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 179 floor of the laiyngotracheal groove directl} continuous with the floor of the branchial portion of the pharynx at its hind end; the former bends up at about right angles to enter the narrow oesophagus (Figs. 87 and 88). Thus the whole pulmonary tract communicates widely with the pharynx at the 35 s stage. Its complete delimination falls within the period covered by Chapter X. The continuity of the ex

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Archive image from page 198 of The development of the chick;. The development of the chick; an introduction to embryology . developmentofchi00lill Year: 1908 FROM TWELVE TO THIRTY-SIX SOMITES 179 floor of the laiyngotracheal groove directl} continuous with the floor of the branchial portion of the pharynx at its hind end; the former bends up at about right angles to enter the narrow oesophagus (Figs. 87 and 88). Thus the whole pulmonary tract communicates widely with the pharynx at the 35 s stage. Its complete delimination falls within the period covered by Chapter X. The continuity of the expansions that form the lung primordia, with the series of visceral pouches as shown in Fig. 100, is especially noteworthy as suggesting a theory of the phylogenetic derivation of the lungs.

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