I've always wondered: what's behind the belly button?

We're constantly told what not to do with it, but what exactly is behind this mysterious orifice?

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不能抠的肚脐眼，究竟藏了什么秘密？_手机搜狐网

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What anatomy is behind the belly button? - Quora

Why touching your belly button makes you need the toilet, The Independent

Diastasis recti, the post-pregnancy belly problem, explained - Vox

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不能抠的肚脐眼，究竟藏了什么秘密？_手机搜狐网