HEART. 
it is often attended by an artery; as in the mefentery, a's 
nies, lungs, arm a and t igh. 
The direétion varies m the trunks and branches. The 
former are commonly ftraight, and confequently the circu- 
tion goes on in them ‘almolt infenfibly ; when they are laid 
bare in a living animal, no locomotio on is Baw lsng Yet ¢ 
ome exceptions occur to t is rule ; as rch of the 
nd the curvatures of the tccual pian The 
is arrangement gives rife 
to that motion of the veflel, which, according to fome, pro- 
duces the pulfe. 
The fmaller divifions of the arteries run in the interior of 
our organs, without, however, entering into their intimate 
ftru€ture. Thus, in the mufcles, they pafs between the 
fibres, i in the brain between the convolutions, in the glands 
the lobes of which ici confilt, &c. * By thefe,”’ 
fays Bichat, * an inteftine motion is rdisicnicated to the 
whole organ, which Leeks its functions, and keeps up 
the activity of its various parts, as the more general motion 
already fpoken of fupports that of the whole part tdken 
together. ‘The fudden. ceffation of life, when the blood 
ceafes to agitate the t 
between this inteltine active powers. 
we obferve, that the vi ital energies are more decidedly sarken 
in all parts where the arteries are very numerous, as in the 
mufc'es, the fin, the mucous furfaces, &c.; while, on the 
contrary, the vi omena are much more obfcure in 
organs of lefs vaicularity, as the tendons, cartilages, bone, 
and other white par 
The tortuofitics of the arteries increafe as they become 
= ee divided, and eat Peer this point hs 
ss Where 
inftance, the veffels muft have been rendered 
firaight by the snes and in the fecond, they muit ate 
throw n into ¢ 3 opened the carotid 1 ina 
to tt peertace: thofi are reduced at once 
fmall ovis Secs vettels mult, therefore, be at once 
confiderably folde elves; yet the blood continues 
to flow with seal as before from the opened Ree 
> after opening the abdomen a livig animal, I 
have alternately folded and ftretched ont he mefentery, of 
whieh — arteries had been previoufly apened ; no dif- 
was perceptible in the jet of blood in thefe two 
Psi of the part. The 
does not ari 
in confequence of chk parti+ 
clr aiien a 0 the limb, but from the direct — of 
join | 0% 
er this aacasigetinat. Here 
off from the convexity of the arch. 
columns o 
: ceffation of the pulfation at the 
1a stes'y the “ee is forcibly bent, e from t 
* 
a 
parts which exert’a confiderable motion in the execution of 
their fun&tions, as in the lips and other parts of the face,. 
.the tongue, the A pals the hollow vifcera, as the ftomach 
and the i inteftine 
This o inion epee the end obtained by the wi 
courfe of arteries, is more full 
Hall 
longitudinem metitur, fi ea re 
flexa, quoties ejus finis a ‘bien “removetur, abfque ullo- 
incommode longior reddi, dum gyria fe invicem recedunt,. 
et arteria totam fuam longitudinem explicat, que nunc ex-- 
porre¢ta diftantiam terminorum metitur. Eit enim ea harum 
flexionu m_ conftans indoles, ut arteria circa ineam i 
gs A 
mo ofes are of Swe kinds : rft, 
trunks unite toget 
joined b 
two equal 
large branch is 
be 
obferved. in the firlt fe) 
es are given’. 
Tw the firft cafe, two: 
lood are united into one, which takes 
direétions of the former:'in the - 
‘ole 
rifms), “« may be juftly applied the 
in tote corpore: unus pesersre 4 et una 
