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| Description: Development of the Skeletal System Most skeletal tissue arises from the middle primary germ layer in embryos known as the mesoderm. Most of the skull arises from the outer layer called the ectoderm. Skull bones develop in 2 ways: The neurocranium forms the bones of the skull itself. It is divided into the cartilaginous neurocranium (hyaline cartilage that undergoes endochondral ossification) and the membranous neurocranium that undergoes intramembranous ossification. The bones of the face form from the viscerocranium. This is also divided into 2 parts: The cartilaginous viscerocranium comes from cartilage of the pharyngeal arches. This forms the ear bones and hyoid bone. The membranous viscerocranium comes from mesenchyme of the first pharyngeal arch, undergoes intramembranous ossification and forms the facial bones. Picture Stats: Views: 289 Filesize: 812.67kB Height: 842 Width: 1186 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41296 |