. Human physiology. to other veins; but there is noevidence of this. M. Eibes concludes, from the results of injectingthe veins, that some of the venous capillaries are immediately conti-nuous with the minute arteries, whilst others open into the cells of theareolar tissue, and into the substance of different organs. When the veins become visible, they appear as an infinite numberof extremely small tubes communicating very freely with each other;so as to form a very fine network. These vessels gradually becomelarger and less numerous, but still preserve their reticular arrangement;until, ultim
. Human physiology. to other veins; but there is noevidence of this. M. Eibes concludes, from the results of injectingthe veins, that some of the venous capillaries are immediately conti-nuous with the minute arteries, whilst others open into the cells of theareolar tissue, and into the substance of different organs. When the veins become visible, they appear as an infinite numberof extremely small tubes communicating very freely with each other;so as to form a very fine network. These vessels gradually becomelarger and less numerous, but still preserve their reticular arrangement;until, ultimately, all the veins of the body empty themselves into the heartby three trunks—the vena cava hiftrlor^ vena cava superior^ and coronaryvein. The first of these receives the veins from the lower j^art of the Vasor. Corpor. Human. Histor., Sen. 1817; and Prodromo della GrandeAnatomie, Firenz., 1819. ^ Secuuda Epistola de Pulmonibus, Opera, Loud., EpistoL 59, Opera, Lugd. Bat., 1722. 350 body, and extends from the fourth lumbar vertebra to the right auricle;the second receives all those of the upper part of the body. It extends from the cartilage of the first rib tothe right auricle. The coronaryvein belongs to the heart exclusive-ly; between the superior and inferiorcava a communication is formed bymeans of the vena azygos. Certain organs, as the spleen, ap-pear to be almost wholly composedof venous radicles. Fig. 107 repre-sents the ramifications of the splenicvein, in the substance of that organ;and if we consider, that the splenicartery has corresponding ramifica-tions, the viscus would seem to bealmost wholly formed of bloodves-sels. The same may be said of thecorpus cavernosum of the penisand clitoris, nipple, urethra, glanspenis, &c. If an injection be throwninto one of the veins that issuefrom these different tissues, they arefilled by the injection; this rarelyoccurs, if the injection be forced intothe artery. j\[. Magendie* affirms,that th
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