What's the difference between zygantrum and zygosphene?

Zygantrum

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Definition:

• (n.) See under Zygosphene.

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Zygosphene

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Definition:

• (n.) A median process on the front part of the neural arch of the vertebrae of most snakes and some lizards, which fits into a fossa, called the zygantrum, on the back part of the arch in front.

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