Volume 2

The anatomy of the human body.

  • Bell, John, 1763-1820.
Date:
1797
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy of the human body. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    IS left ventricle ; the right ventricle, which is much bigger, laxer, flatter, and with thinner walls, is, as it were, wrapped round the left; and thus the left ventricle alone forms the acute apex of the heart, and the left ventricle of neceffity bulges very much into the cavity of the right, lince the right ventricle is fo much larger,' and in a manner wrapped round it. In both ventricles, this is very remarkable, that towards the opening of the auricle it is very rugged, irregular, and crofTed with columnar carneze, while a fmooth and even lubricated channel (as it feems), marked (jn,)— leads towards the artery. 7. The pulmonic artery arifes from the right ven- tricle, to carry out the blood clofe by the great open- ing at which the auricle pours it in; the artery rifes at its root in a very bulging triangular fliape. It is the valve within the mouth of the artery that gives it this very peculiar fhape without; for the bulging- root is divided into three knobs, indicating the places of the three valves, the artery dilating behind each valve into a little bag, which, when it is defcribed. is called its finus. 8. This valve of the pulmonic artery («)—has a more perfect and fimple form than that of the auricle. The valves in the mouth of each of the great arteries are three in number ; they are thin but flrong mem- branes, rifing from the circle of the artery, where it comes off from the heart : each valve is fe- milunar; its larger and loofer edge hangs free into the cavity of the artery; the edge is a little thicker than the reft of the valve ; the three valves together form one perfect circle, which clofe&the mouth of the artery