Final answer:
The mature bone cell residing in lacunae and responsible for maintaining bone is called an osteocyte, which is derived from osteoblasts and communicates through canaliculi.
Step-by-step explanation:
The name of the mature bone cell that occupies lacunae and communicates with other cells to maintain bone is an osteocyte. These cells are derived from osteoblasts, which are responsible for the formation of new bone and secreting the bone matrix. When osteoblasts become enclosed in this matrix, they transition to a less active phase and become osteocytes. Osteocytes play a crucial role in maintaining the mineral concentration of the matrix and are equipped to communicate with other bone cells via cytoplasmic processes that extend through canaliculi. Unlike osteoblasts and osteoclasts, which are involved in the formation and resorption of bone tissue respectively, osteocytes are primarily concerned with maintaining the existing bone tissue.