258 GENERAL ANATOMY. 



The ligamentous tissue receives few blood vessels; the dura 

 mater is somewhat rather better provided; and the perioste- 

 um is reddened a little by injection. 



The bones have but a small number of vessels. The capil- 

 lary vessels of the muscles are abundant; the smallest, which 

 are tortuous, accompany and surround the muscular fibres, fre- 

 quently anastomosing. 



The nervous system is furnished with capillary vessels, 

 which are more abundant in its envelopes and in the cineri- 

 tious substance, than in the medullary substance. The pia 

 mater and the neurilema generally, which differ in this re- 

 spect from the envelopes of many of the viscera, contain the 

 vessels until the greater part of them have acquired a capilla- 

 ry tenuity. The cineritious matter of the brain and the nerv- 

 ous ganglia possess a multitude of capillary vessels of all sizes. 

 The white matter, on the contrary, either of the encephalon 

 or nerves, possesses only very small capillary vessels, and in a 

 smaller number. 



384. There is therefore in the different organs, a greater 

 or less proportion of a substance not vascular, or which at 

 least can not be shown to be so by injections. 



Meyer,* having introduced a colouring matter into the blood, 

 both by absorption and by injection, concluded, from the differ- 

 ent colouring of the parts of the body, that there are two kinds 

 of organs, one set composed for the greater part of capillary 

 vessels, viz: the cellular tissue, the serous membrane, the te- 

 gumentary membranes, and the fibrous or ligamentous tissue; 

 the other, more sparingly furnished with blood vessels, and 

 formed of globules or of an organic pulp, viz: the glands, the 

 bones, the muscles, and the medullary nervous substance 



This proportion also changes with age; at the commence- 

 ment, at least in the ovipara, the blood is seen and presents 

 currents before there are solid parts; soon after, the walls of 

 the vessels are formed. The younger the animal, and the 

 nearer to the foetal state, the greater is the proportion of ves- 



Memoire sur f absorption veineuse, &c. in deutches archiv, &c. and in the 

 Journal complc'mentairc, vol. xi. 



