Just pointing out that I found Medusa's Head behind the waterfall in the Mountain Village Tosca - Exterior.
Not sure if it's missable or something completely different, but it's not on the item list so I thought I'd point it out.
Every night, I can feel my leg, and my arm... even my fingers.
The body I've lost... the comrades I've lost... won't stop hurting.
It's like they're all still there. You feel it too, don't you?