You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is The first bone to show both endochondral and intramembranous ossification : and explain in detail?
The cranial base will be in cartilaginous form till 7th week of prenatal form. After that, the bones of cranial base undergo both endochondral as well as intramembranous ossification. The first bone to show both endochondral and intra-membranous ossification is occipital bone. The supranuchal squamous part of occipital bone ossifies intramembranously during the 8th week of intra-uterine life.