The skeleton of the head of a vertebrate animal, including the brain case, or cranium, and the bones and cartilages of the face and mouth. See Illusts. of Carnivora, of Facial angles under Facial, and of Skeleton, in Appendix.
The head or brain; the seat of intelligence; mind.
There is great treasure there behind our skull and this is true about all of us. This little treasure has great, great powers, and I would say we only have learnt a very, very small part of what it can do. Isaac Bashevis Singer