pannicle

noun3

1. •
   A membrane of tissue in the body of a human or animal.
2. •
   (no longer used) A pannus.
3. •
   (no longer used, rare) The skull.

   • To him he turned, and with rigour fell / Smote him so rudely on the Pannikell, / That to the chin he cleft his head in twaine [...]. — 1590