Opisthotonus

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What Wikipedia says

Opisthotonus or opisthotonos (from Ancient Greek: ὄπισθεν, romanized: opisthen, lit. 'behind' and τόνος, tonos, 'tension') is a state of severe hyperextension and spasticity in which an individual's head, neck and spinal column enter into a complete "bridging" or "arching" position.

Excerpt from the Wikipedia article “Opisthotonus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sir Charles Bell, Public domain, via Wikimedia Commons.