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 Nutritional supply of the ameloblasts during most of their life cycle is from the: and explain in detail?
Before the appearance of 1st layer of dentin, ameloblast derive nutrition from dental papilla. After dentin layer formation they receive nutrition from the capillaries of dental sac that surround the outer enamel epithelium.