LYMPH AND TISSUE FLUIDS 



1067 



channels and pump the lymph into the veins. In the higher animals and in 

 man the onward flow of lymph is effected partly by the pressure at which it 

 is secreted from the capillaries into the interstices of the tissues, but also to 

 a large extent by the contractions of the skeletal muscles. In the smaller 

 lymph radicles the pressure of lymph may attain 8 to 10 mm. soda solution. 



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 mnH-rTn-^rl-T i^H-l-1-~-i h!-^H-+M-f-4-rh+--T-.^ :-.- -r-H-H 



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 inj. of 40grams dextrose 



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40 



50 



60 minutes 



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S/e d to 240 cent Inj. 18 grams dextrose 



FIG. 489. Effect on lymph flow and on arterial and venous pressures of injection 



of concentrated solution of glucose. 



In B the animal was bled to 240 c.c. before the injection. The double line 

 = lymph flow in c.c. per ten minutes; thin line = portal vein; thick line = 

 carotid artery ; dotted h'ne = inferior vena cava. 



In the thoracic duct, at the point where it opens into the great veins of the 

 neck, the pressure is obviously the same as in these veins, that is to say, 

 from 4 to mm. Hg., the negative pressure being occasioned by the aspira- 

 tion of the thorax. This difference of pressure is sufficient to cause a certain 

 amount of flow. It must be remembered however that under normal 

 circumstances no lymph at all flows from a resting limb. The only part of 

 the body which gives a continuous stream of lymph during rest is the alimen- 

 tary canal, the lymph in which is poured out into the lacteals, and thence 



