. A laboratory manual and text-book of embryology. Embryology. 196 THE ENTODERMAL CANAL AND ITS DERIVATIVES from (4) the dorsal mesentery. In addition to these, the striated muscle of the diaphragm, according to Bardeen, takes its origin from a pair of pre-muscle masses which in 9 mm. embryos lie one on each side opposite the fifth cervical segment. This is the level at which the phrenic nerve enters the septum trans- EsophaauS Common cardinal vein Septum trans vers urn Pleura-pericardial canal , Lung Pericardial cai/ffy. Pleural cavity * Pleura-peritoneal membrcuie 'Pleural cavity {Pericardia
. A laboratory manual and text-book of embryology. Embryology. 196 THE ENTODERMAL CANAL AND ITS DERIVATIVES from (4) the dorsal mesentery. In addition to these, the striated muscle of the diaphragm, according to Bardeen, takes its origin from a pair of pre-muscle masses which in 9 mm. embryos lie one on each side opposite the fifth cervical segment. This is the level at which the phrenic nerve enters the septum trans- EsophaauS Common cardinal vein Septum trans vers urn Pleura-pericardial canal , Lung Pericardial cai/ffy. Pleural cavity * Pleura-peritoneal membrcuie 'Pleural cavity {Pericardial Heart membrane Fig. 190.—Diagrams showing the development of the lungs and the formation of the pericardial mem- brane (modified after Robinson). A, coronal section; B, transverse 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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