* wards, and whe 
fourth 
' ylor vena cava, which has a courfe of fome 
_ heres thea wricular — is very. 
Thi 
the orifice of ¢ 
HEART 
ing inside and in clofe Aare to the left auricle 
from which it is feparated by a thin feptum. . It is broader 
and larger than the left; but this inequality, which is fuf- 
— obvious in the adult, i is. —— y perceptible in the 
foetus and bar child. oblong trom above down- 
n diftended: weiily refembles in figure the 
peinicf narod. We deferibe init an ex vand an 
internal fide, an anterior fide, a fuperior and an inferior ex- 
tremity. The external fide, convex and {mooth, is contiguous 
tothe: pericardium ; the internal is confounded with the left 
auricle, and the anterior is united to the bafis of the right 
ventricle. e upper extremity receives behind the dupe- 
within the 
pericardium, and defcends rathet obliquely from right to 
left, and from behind forwards. On the front this extremity 
ts a narrow 2 a or appendix, of a flattened 
in a point, and havin wert — jagged 
ol it is: placed nearly tranfverfely between the aorta 
—_ ventricle, Ato mparifon of this loofe procefs 
ear-gave ufe to the appellation of auricula, which 
tr to this. _ “only, but n extended 
to acy whole cavity. By Latin writers the coicda is ftill 
vene caver. 
_ Its.dire@tion is rather oblique:t rom right 
to let and from before backwards. 
of the auricle, the c external fide prefen 
— jecti formed by mufcular fafciculi, 
whieh-are fanaa rom ge pias 0th intervals of various 
length and breadth. 
as'to have been compared to veh teeth of a 
, together fmaller oe & 
cull difpoted « whdighéty:; in their intervals. ‘The internal fide 
is formed’by the feptum, pe ag the two quricles. - In 
the adult it prefents, below its a depreffion-which i is 
ovalis, although its isomer is very nearly ci 
in, being com 
ffion is 
named mufculi pectinati: they are directed from behind 
forwards, and communicate by other 
eriorvena cava. ‘Towards its upper part, an opening of 
various fizes, by which the -two 
y 
seca hs sang anne 
wry Se 
i 
slat y's fl a ae engi bake with the 
former i ape sO towards 
: the: 
eae at and fepatates the foffa ovalis from 
coronary veins ; pr seronce is much Jefe 
sa ote Oras 
saccurate ex examination does not feem 
or mufcular fibres. In he dt 
ts a: 
lar 
for the moft art rallel, fo 
‘ ssiad hence 
auricles + communicate, is. 
withthe ventricle, 
: po gg er a etl Soctes ros 
tions*of this part anatomifts have ~_— greatly, Some 
place a ar here, and derive ufcular fibres of the 
rit from it; others defcribe cicahie mufeular fibres 
_ Senac admits a tendinous itriéture 
iv agg me i mem- 
brana conjungit ;” ‘and adds in another ac vero: 
lineam reperl, nullum vettigium’ mufculi teidiniive hic, 
reperio.’ 
On the front the fuperior extremity 
of the auricular ee defcribed a 
opening of the 
refents the entrance 
ve} behind i is. the 
Mufcular. 
The fides a al ee sm re between the, two 
veins in n of the par fafci 
thed wit: 
named valvula, a or nobilis, 
a fmall pempeanes vA 
of fize varies in different me af is never, 
{ufficient to cover the whole of the opening. It is generally 
in the we than in the adult ; after ticth ge not solr 
pay “One ed 
laced downwards, and“rathe 
anterior and left a of the poeaiag Pe ie the inferise 
cava; the latter backwards 
of the opening of the inferior cava. "The E uftachtan valve i 
formed Uy atid of ‘the membranes, which«lities the Ah a 
of j 
auricle ‘ many fubjeGis its rate: Parad mea tel 
net-wor The ofte ofthis valve feems to- be 
th -culatior t fine of f the fli fo mich fo micls 
more fe 7 fi time, . 
The 1 of the g coronary, vein is placed between: 
that of the inferior cava, and the aperture of commenication 
and near-to'the feptum of the.auricles, 
