What is the name of the area where osteoblasts actively deposit new bone from the outer surface inward within an osteon?

Explanation

The 'filling cone' refers to the zone where osteoblasts lay down new bone matrix, moving from the outer part of the osteon inward. In contrast, the 'cutting cone' is the area where osteoclasts resorb bone tissue, and the 'Haversian cone' and 'Howship's cone' are not terms used to describe this specific bone formation process.