the development of the brain box the neurocranium It is derived from two portions a membranous portion b Cartilagenous portion called the chondrocranium a membranous portion that forms flat bones of cranial vault from cells of neural crest amp occipital paraxial mesoderm ID: 1048282
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1. Development of the skull:the development of the brain box (the neurocranium):It is derived from two portions;a. membranous portion b. Cartilagenous portion; called the chondrocranium,
2. a. membranous portion; that forms flat bones of cranial vault from cells of neural crest & occipital paraxial mesoderm. These flat bones begin as bony specules radiating from a primary ossification center. After birth, these flat bones enlarged by osteoblastic cells adding bones at outer surface with osteoclastic activity absorbing bones from inner surface. At birth, these flat bones are separated by C.T. called sutures, and larger C.T. called fontanelles that are derived from neural crest.
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4. This C.T. allow overlapping or called molding of these flat bones to decrease size of skull during its passage out of birth canal. Remodeling of flat bone occurs after birth resulting in a larger vault in comparison to face. connective tissues of sutures and fontanelles ossify later on. Before ossification fontanels indicates intracranial pressure.
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7. 2.development of the face bones (the viscerocranium):They develop from mesoderm of pharyngeal arches
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