216 



HITCH COCK'S ANATOMY 



Fig. 219. 



tion of their branches, without any increase in their diam- 

 eter. The only exception to this is where red blood is not re- 

 quired for the nourishment of 

 the parts ; as in the white of 

 the eye, the finger nails, the 

 tendons, etc., where the ca- 

 pillaries are too small to allow 

 the corpuscles of blood to pass 

 through them. And yet in 

 many of the capillaries we find 

 their size to be so small that 

 the corpuscles could not, if 

 unyielding, pass through. 

 But this is readily accom- 

 plished in most cases by the 

 flexibility of the corpuscle, 

 which permits itself to be 

 doubled up to such an extent 

 that it will easily pass through 

 a tube much smaller than its 

 normal diameter. In the ca- 

 pillaries the important pro- 

 cesses of secretion, nutrition, 

 and the production of a por- 

 tion of animal heat take place ; 

 so that there is no place in 

 the whole body except the 



A Yiew of the Veins, of the Trunk and outer COat of the eye, the ten- 

 Neck. 1, The Descending Vena Cava. 2, -, .-. -, i » . 

 The Left Vena Innominate. 3, The Eight donS, the nails, and white 

 Yena Innominata. 4, The Eight Sub-Cla- portions of the body gener- 

 vian Yein. 5, The Internal Jugular Vein. r . ~ . 

 6, The External Jugular. T, The Anterior ally where true Capillaries are 

 Jugular. 8, The Inferior Vena Cava. 9, . f nnnf ] 

 The External Iliac Vein. 10, The Internal 11UL iUUUU * 

 Iliac Vein. 11, The Primitive Iliac Veins. 



12, 12, Lumbar Veins. 13, The Eight Spermatic Vein. 14, The Left Spermatic Yein. 

 15, The Eight Emulgent Vein. 16, The Trunk of the Hepatic Veins. 17, The Vena Azy- 

 gos. 18, The Hemi-Azygos. 19, A Branch communicating with the Left Eenal Vein. 

 20, The Termination of the Ilemi-Azygos in the Vena Azygos. 21, The Superior Inter- 

 Costal Vein. 



Where are true capillaries not found ? What takes place in them ? 



