brainpan

noun2

1. •
   (informal) The braincase; the skull.

   • Many a time but for a Sallet, my braine-pan had bene cleft with a brown Bill. — 1591
2. •
   (informal) The brain or mind.

   • ‘And a hard word it is,’ said Richie, ‘as my brainpan kens to this blessed moment.’ — 1822