G2 



Florence E. tfabin. 



In fig. 8 it will be seen, for example, that the large vessels of the 

 suprascapular region drain into the apex of the sac, but some of them 

 have small connections with the cervical plexus. In fig. 16 these 

 connections are so much more abundant that they exceed in numbei 



Fig. 17. — Injection of the jugular lymph sac and the cervical lymphatii 

 plexus of a foetal pig 7.5 cm. long to show the relation of the developing 

 lymph glands to the jugular sac. After A. H. Clark (24). Magnified ! 

 times. Fixed in 10 per cent formol and cleared by the Spalteholz method 

 A. s. =; apex of the sac, which is now a lymph gland in the posterior triangh 

 of the neck; the anterior curvature of the sac, which is now a deep jugulai 

 lymph gland, lies behind the sternocleidomastoid muscle. C. p. = super 

 ficial cervical lymphatic plexus, which will become a group of lymph glands 

 At the cerebral end of the cervical plexus a developing facial lymph gland 

 S. g. = lympho-glandula submaxillaris. 



those that pass to the sac itself. This point of the anastomoses o: 

 the dfficult groups of vessels is well shown in fig. 5 (Sabin 130), wher> 

 practically all of the superficial lymphatics in the embryo pig 5.5 cm 



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