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Dragon Heartstring is used for wand cores by both Ollivander and Gregorovitch. What part of a dragon's heart do the Heartstrings come from? Do Heartstrings come from an entirely different part of the dragon, despite the name?

What is a Dragon Heartstring? What part of the dragon does a Heartstring come from?

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No JKR info that I could find, but most likely it is Chordae Tendineae

The chordae tendineae are tendons linking the papillary muscles to the tricuspid valve in the right ventricle and the mitral valve in the left ventricle. As the papillary muscles contract and relax, the chordae tendineae transmit the resulting increase and decrease in tension to the respective valves, causing them to open and close. The chordae tendineae are string-like in appearance and are sometimes referred to as "heart strings." (source source)

Since dragon heart generally plays role in assorted lore, it makes sense that a wand core associated with an actual part of dragon's heart would be considered powerful.

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    Does that mean that they had to kill a dragon for every few wands? – chama May 2 '12 at 18:16
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    @chama Either that or they asked it very politely. – Xantec May 2 '12 at 18:27
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    @charma: Maybe they got it from a dragon that has more than one heart, and if you remove one heart, the dragon survives, and maybe even regenerates a new heart. Or maybe they used dragons that have died of natural causes. In any case, this might explain what Charlie Weasley's actual job is. – b_jonas May 2 '12 at 18:49
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    They weren't artificially manufacturing those unicorn horns for potions either. :P I would presume that they farmed dragons specifically for wand cores/potion ingredients, much like we farm cows for food and leather. – Gabe Willard May 2 '12 at 19:10
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    I think my head just exploded trying to picture a "dragon farm." – J.T. Grimes May 2 '12 at 19:31

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