Which cell type or types in the following image are responsible for the development of compact and spongy bone during intramembranous ossification?

An ossification center refers to the specific location within the mesenchyme where bone formation begins. While it is a critical site for the initiation of ossification, it does not represent a cell type itself but rather a region where osteoblasts and other cells are active in the bone formation process.

Mesenchymal cells are progenitor cells that can differentiate into various cell types, including osteoblasts. Although they play a vital role in the early stages of bone formation, they do not directly form bone tissue. Instead, they give rise to osteoblasts, which are the actual bone-forming cells.

Osteoclasts are large cells that break down bone tissue, a process known as bone resorption. Their primary function is to maintain bone health and regulate calcium levels in the body. However, they do not contribute to the formation of bone; rather, they play a role in bone remodeling and repair.