JUGULAR LYMPH SACS AND CHANNELS — NECK OF PIG 



49 



The first group consists of a few large vessels which have grown 

 from the apex, the most superficial part of the sac, over the scapu- 

 lar region. The second place of growth is the dorsal border of 



Fig. 1 Diagram of the jugular lymph sac in an embryo pig 2.8 cm. long to show 

 the points of origin of the peripheral vessels. X 10. A, apex; A.C, anterior cur- 

 vature; C.C, cross connection between the apex of the sac and the sac stalk; C.P. 

 superficial cervical plexus; 0, occipital lymph duct; Pa.T.F, point of origin of the 

 posterior-auricular, temporal and facial lymphatics; Rp, retropharyngeal lym- 

 phatics; S, stalk of the sac; Sm, submaxillary lymphatics; S.S, primary supra- 

 scapular lymphatics; S.Si, suprascapular lymphatics from the cervical plexus; 

 T.B.L, thoracic and branchial lymphatics. 



the apex just anterior to the suprascapular vessels. A large 

 duct extends forward over the occipital region of the head. This 

 particular vessel is very large in the human embryo as can be seen 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 14, NO 1 



