. Anatomy, descriptive and applied. Anatomy. 556 THE VASCULAR SYSTEMS The anterior cardiac veins open into the lower fore part of the right auricle. The right auriculoventricular opening, or the tricuspid orifice {ostium venosum dexirum), is the large oval aperture of communication between the right auricle and the ventricle; it will be described with the right ventricle. The Eustachian valve (valvula venae cavae inferioris [Eustachii]) is situated in front of the orifice of the inferior vena cava. It is semilunar in form, its convex margin being attached to the anterior margin of the inferior
. Anatomy, descriptive and applied. Anatomy. 556 THE VASCULAR SYSTEMS The anterior cardiac veins open into the lower fore part of the right auricle. The right auriculoventricular opening, or the tricuspid orifice {ostium venosum dexirum), is the large oval aperture of communication between the right auricle and the ventricle; it will be described with the right ventricle. The Eustachian valve (valvula venae cavae inferioris [Eustachii]) is situated in front of the orifice of the inferior vena cava. It is semilunar in form, its convex margin being attached to the anterior margin of the inferior caval orifice; its con- cave margin, which is free, terminates in two cornua, of which the left is continuous with the anterior edge of the annulus ovalis, while the right is lost on the wall of. Fig. 414.—Heart opened to show the interior of the right auricle and of the two ventricles, from in front. The wall of the right auricle is turned back to show- the musculi pectinati and the crista terminalis. The ven- tricular walls and the ventricular septum have been cut. The aortic \-alve is made more prominently visible in the drawing than it really is in nature. auricle, containing a few muscle fibres. In the fetus this valve is of large size, and tends to direct the blood from the inferior vena cava, through the foramen ovale, into the left auricle. In the adult it is occasionally large, and may assist in preventing the reflux of blood into the inferior vena cava; more commonly it is small, and its free margin presents a cribriform or filamentous appearance; occa- sionally it is altogether wanting. The coronary valve or valve of Thebesius (valvidae sinus coronarii [Thebesii]) is a semicircular the lining membrane of the auricle, protecting the orifice of the coronary sinus. It prevents the regurgitation of blood into the sinus during the contraction of the auricle. This valve is occasionally Please note that these images are extracted from scanned page images
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
