i tried to avoid convinction so im open to several thories
you can check how this link defines the fornix as a amuscle:
http://www.probertencyclopaedia.com/...ornix&offset=0
"The fornix is an arching bundle of white muscle fibres ..."
also i want to say that my sight still isnt perfect but the improvement from 8 dioptires is really huge
edit:
have you noticed a click, click sound every time you yawn coming from the center of your head?
i think thats due to the fornix strecthing the brain and cracking the calcifictions
edit:
also when i tense that muscle i hear crunchy sounds from the center of my head like click click
that points to myself being decalcifying the brain, of course i wont put the hand in the fire for it