Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 20 On the Cartilaginous Substance Which Is Ascribed to the Base of the Heart, Or the Bone of the Heart

Cartilaginous substance of the heart

These roots [conus arteriosus] in which the bases of the membranes [valva] are located and which


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are responsible for preventing the reflux of materials [sanguis] from those two vessels into the heart, are much harder than the remaining substance of those vessels, so that the roots seem to participate somewhat in the nature of cartilage. In cattle, it sometimes hardens 6 in the same way we have previously stated that the rib cartilages of quadrupeds revert into white, friable bone covered by cartilage on the outside like a membrane. These roots of the vessels are contiguous (C) [tunica externa] just as if you joined two circles (A and B) at a point and made them tangential to each other, so that the right circle would be the root of the arterial vein [truncus pulmonalis] and the one on the left (which is larger) the root of the great artery [aorta]. The point where the circles [tunica externa] join would be the place where these vessels join their circles and are fused together, 7 and where the best portion of cartilage would be, which is oblong and more or less rounded: the entire location where those roots join, and the remaining portions of the circles, would be resected. Hence, so far as I am concerned, one could call these roots 8 either coronary cartilage or bone, provided one look carefully into their nature and not, like the followers of Galen who quite negligently explain his opinions, be so dull-witted as to convince himself that the bone of the heart is shaped like a L or u.



Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 20 On the Cartilaginous Substance Which Is Ascribed to the Base of the Heart, Or the Bone of the Heart