. These portions of the coelom jjecome cut off, first from the pericardium and later from the peritonaeum, thus producing two closed sacs, the pleural cavities. Each of these is lined with a continuous layer of mesothelium, which, with the underlying connecti^•e tissue, con- … ih.ao. Fig, 26s.—Reconstruction of aPari of a Human EmbryoOF- 13.8 MM. (Ur. V. \\Thyng.) ao., Aorta ; d. a., ductus arteriosus;I., entodermal part of tlic- luiic;;I. at., left atrium , I. br., lefti)roiiclius ; 1. r., left ramus ofpulmonary artery, p. a.: P. P.,its rigfit ramus; oe., oesoptia-gus ;…
Histology · Microscopy
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