Archive image from page 346 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 AVES. 331 gurgitation by this orifice is prevented is one second muscular valve, which, though small, is of the chief peculiarities in the heart of Birds. Fig. 169. n m \ \ Fig. 168. Ventricles of the heart of a Swan. The right ventricle (k,Jig. 168) is a narrow trian- gular cavity, applied as it were to the right and anterior side of the left ventricle, but not ex- tending to the apex of the heart. The parietes are smooth, and, except at the septum ventri
Archive image from page 346 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana01todd Year: 1836 AVES. 331 gurgitation by this orifice is prevented is one second muscular valve, which, though small, is of the chief peculiarities in the heart of Birds. Fig. 169. n m \ \ Fig. 168. Ventricles of the heart of a Swan. The right ventricle (k,Jig. 168) is a narrow trian- gular cavity, applied as it were to the right and anterior side of the left ventricle, but not ex- tending to the apex of the heart. The parietes are smooth, and, except at the septum ventri- culorum, they are of pretty uniform thickness, but weaker in comparison to those of the left ventricle than in Mammalia. A number of short fleshy columns extend from the septum to the free parietes of the ventricle at the angle of union of these two parts, leaving deep cells be- tween them; a strong fleshy column (m,fig. 169) also extends from the right side of the base of the pulmonary artery to the upper extremity of the auriculo-ventricular valve; but these are the only columns earner in the right ventricle ; there being none of a pyramidal form pro- jecting into the cavity, nor any chordte ten- dinex. The principal valve which guards the auricular aperture is a strong muscular fold (I, fig. 167, 168, 169), nearly as thick as the walls of the ventricle itself, extending from the fleshy column above mentioned obliquely down- wards and backwards to the angle formed be- tween the septum cordis and the wall of the ventricle at the lower and posterior part of the cavity. The free rounded edge of this muscular valve is turned towards the convex projection made by the septum, and must be forcibly ap- plied to this part during the systole of the ventricles, so that, while all reflux into the auricle is prevented, additional impulse is given to the flow of blood through the pulmonary artery; the muscular parietes of the ventricle being thus complete at every part except at the or
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