THE VASCULAR SYSTEM 



i8' 





They are called afferent lymphatics. The lymph moves free 

 through the tissue of the gland, and on the opposite side is 

 taken up by the efferent lymphatics. 



The right and left tracheal trunks 

 lie on their respective sides of the 

 trachea and empty into the ex- 

 ternal jugular vein in the common 

 jugular and jugulo-subclavian dis- 

 tricts together with the right 

 lymphatic and thoracic ducts. 

 The openings are guarded by 

 valves which prevent the blood 

 from entering the lymphatic trunk. 



The thoracic duct (Fig. 91) is 

 the largest vessel of the lym- 

 phatic system, but is usually 

 invisible unless injected. It 

 extends from the region of the 

 kidneys on the dorsal aspect of 

 the body cavity, along the left 

 side of the spinal column, to 



Fig. 91. — Ventral Aspect of Chief 

 Lymphatic Vessels of the Cat. 

 a. Axillary gland; as, pancreas Aselli; aft, 

 superficial lymphatics from the head; b, 

 bronchial glands receiving lymph from 

 lungs; c, lymphatic trunk; cr, cervical 

 glands; cv, laryngeal glands; d, vessel from 

 diaphragm; ej, external jugular vein; in, 

 inguinal glands; il, iliac glands; ju, junc- 

 tion of thoracic duct with tracheal trunk; 

 /, lumbar glands; It, large intestine; Iv, 

 lymph-vessel from liver; ?n, lacteal vessel 

 and glands of mesentery; n, superficial 

 lymphatics from limb; o, deep lymph-vessels 

 from limb; on, lymphatics from thoracic 

 wall; ol, vessel from abdominal wall; oc, 

 vessels from limb; rec, receptaculum chyli; 

 s, subclavian vein; /, lymphatics from skin 

 of leg; tr, tl, tracheal trunks; va, lymph 

 trunk from pancreas Aselli to thoracic duct; 

 V, superior vena cava; i and 2, submaxillary 

 lymph glands. 



