. A laboratory manual and text-book of embryology. Embryology. 176 THE ECTODERMAL CANAL AND ITS DERIVATIVES Mzdiasti the formation of two equal buds been described. Such buds formed dichoto- mously do not remain of equal size (Flint, Amer. Jour. Anat., vol. 6, 1906-1907). The entodermal anlages of the lungs and trachea are developed in a median mass of mesenchyma dorsal and cranial to the peritoneal cavity. This tissue forms a broad mesentery termed the mediastinum (Fig. 169). The right and left stem buds of the lungs grow out laterad, carrying with them folds of the mesoderm. The branch- ing
. A laboratory manual and text-book of embryology. Embryology. 176 THE ECTODERMAL CANAL AND ITS DERIVATIVES Mzdiasti the formation of two equal buds been described. Such buds formed dichoto- mously do not remain of equal size (Flint, Amer. Jour. Anat., vol. 6, 1906-1907). The entodermal anlages of the lungs and trachea are developed in a median mass of mesenchyma dorsal and cranial to the peritoneal cavity. This tissue forms a broad mesentery termed the mediastinum (Fig. 169). The right and left stem buds of the lungs grow out laterad, carrying with them folds of the mesoderm. The branch- ing of the bronchial buds takes place within this tissue which is covered by the mesothelium which lines the body cavity. The terminal branches of the bronchi are lined with entodermal cells which flatten out and form the respiratory epithelium of the adult lungs. The surrounding mesenchyma differentiates into the muscle,. Inf. vena cava Fatcifg, Wall of umbilical cord Fig. 169.—Transverse section through the lungs and pleural cavities of a 10 mm. human embryo. X Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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