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Skull ( lat. Cranium ) the bone of the head in vertebrate animals bony skeleton of the head protecting it from damage and serving the attachment of its soft tissues.
The brain skull develops during phylogenesis in parallel with the development of the brain. Primitive animals that do not have a brain do not have a cranium embryonic brain chordates surrounded by connective tissue sheath ( "membranous skull").
In fish with a more developed brain a protective box is formed; in cartilage (squaloid) it consists of cartilage tissue and have bony cartilaginous tissue replaces bone.
Amphibians coming on the land have an even more robust skull due to the further replacement of cartilage on the bone. It is necessary for protection support and movement in conditions of terrestrial existence.
With the evolutionary development of vertebrates the connective and cartilaginous tissues of the cerebral cortex are almost completely replaced by the bone marrow. In parallel with these changes and the anatomy of the individual bones decreases the number and the complicated structure of the skull base bones due to fusion of the bones of more simple.
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