Sometimes it doesn’t, but a lot of autonomic nervous function is controlled by the [vagus nerve](https://en.m.wikipedia.org/wiki/Vagus_nerve) which runs independently from the nerves of the spinal column.
Fun fact: finger/anal stimulation of the vagus nerve in the anus has shown to cure [hiccups](https://www.newscientist.com/article/dn10207-ig-nobel-prizes-hail-digital-rectal-massage/).
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