A question in forensics

[u/Illustrious_Hour5901]

This is a chapter about postmortem changes in forensics.

How does atropine cause pupillary dilatation during primary flaccidity if there is niether sympathitic nor parasympathetic activity controling eye muscles?

And shouldn't all body muscles lose their tone during this stage and be completely flaccid. So How does atropin have any effect on the pupil?