A membrane envelopes the entire brain like a soft sack. This thin, essential covering is called the "pia mater." One medical dictionary I used years ago showed a translation of pia mater as "tender, affectionate mother."
The delicate membrane protects the brain without creating any pressure or restriction.
If we contemplate our brains with this kind of loving care, we may easily remember to do the things we know will help preserve cognition and grow an ever greater capacity for vibrant living.