VELOCITY AND PRESSURE OF BLOOD-FLOW. 497 



$\> C-M R F P S 



ieo 



ite 



IV) 



100 



Fig. 199. Curve showing the results of actual measurement of systolic, diastolic, and 

 mean pressure (lateral pressures) along the aorta and femoral of the dog. The branches 

 through which the lateral pressures were obtained are indicated as follows: Sb, Left sub- 

 clavian; C-M, celiac and superior mesenteric; R, left renal; F, left femoral (Ellenberger 

 and Baum), external iliac; P, profunda branch of femoral; S, saphena. The pressure in 

 millimeters is given along the ordinates to the left. It will be noted that the mean and 

 the diastolic pressures remain practically the same throughout the descending aorta and 

 into the femoral. The systolic pressure shows a marked increase at the lower end of 

 the aorta and then falls off rapidly. The pulse pressure at the inferior end of the descend- 

 ing aorta is much larger than at the arch. (Dawson.) 



figures vary with the conditions under which the results have been 

 obtained. Such, values as the following may be quoted:* 



Horse 321 mms. to 150 mms. Hg. 



Dog 172 



Sheep 206 



Cat 150 



Rabbit 108 



Man (probable, Tigerstedt) 150 



104 

 156 



90 



32 



*See Volkmann. "Die Haemodynamik," 1850. 



