The development of the human body; a manual of human embryology . cs to. the arm; D, diaphragm; Dubranches to duodenum; FV, femoral vein; H, branches to heart; K,kidney; LegD, deep lymphatics to leg; Lu, branches to lung; MP,branches to mesenteric plexus; CE, branch to oesophagus; PCVcardinal vein; PLH, posterior lymph heart; RC, receptaculumchyh; RLD, right lymphatic duct; ScV, subclavian vein; SV sciaticvein; St, branches to stomach; TD, thoracic duct; WB, Wolffianbody.—(Sabin.) THE LYMPHATICS. 293 In embryos of 20 mm. a second pair of lymph heartsdevelops at the junction of the sciatic vein
The development of the human body; a manual of human embryology . cs to. the arm; D, diaphragm; Dubranches to duodenum; FV, femoral vein; H, branches to heart; K,kidney; LegD, deep lymphatics to leg; Lu, branches to lung; MP,branches to mesenteric plexus; CE, branch to oesophagus; PCVcardinal vein; PLH, posterior lymph heart; RC, receptaculumchyh; RLD, right lymphatic duct; ScV, subclavian vein; SV sciaticvein; St, branches to stomach; TD, thoracic duct; WB, Wolffianbody.—(Sabin.) THE LYMPHATICS. 293 In embryos of 20 mm. a second pair of lymph heartsdevelops at the junction of the sciatic veins with the cardi-nals (Fig. 153, A, PLH), and from these branches grow to-ward the surface and radiate subcutaneously, similarly tothose from the anterior hearts, with which they eventuallyunite. The thoracic ducts, continuing to elongate back-ward, dilate opposite the kidneys to form two rcceptaculachyli (Fig. 153, B,RC) and still more posteriorly unite withthe posterior lymph hearts, which then separate com-pletely from the veins from which they m Fig. -Developing Lymphatic Gland from the Axilla of anEmbryo of Eleven Weeks.—(Chievitz.) In later stages branches, arising as outgrowths from thethoracic ducts, gradually invade the mesentery and thevarious organs, following in general the course of the arte-ries, as do also the branches which pass to the limbs toform their deep lymphatics; the superficial branches, onthe contrary, follow essentially the course of the lymph hearts gradually elongate as developmentproceeds and eventually become undistinguishable fromthe vessels, and at various points in the system minuteplexuses arise, around which the adjacent mesenchyme 294 THE DEVELOPMENT OF THE HUMAN BODY. condenses to form a capsule, the whole constituting alymph-node (Fig. 154). Up to this stage of the development no valves are pres-ent in the vessels, and the development of these has yetto be studied, as has also the final transformation of th
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
