Intramembranous ossification is a process by which bone tissue forms directly from mesenchymal tissue, which is a type of connective tissue. This method primarily occurs in the development of flat bones, such as those in the skull and the clavicle. During this process, mesenchymal cells differentiate into osteoblasts, which are cells that produce bone matrix. As the osteoblasts secrete the bone matrix, they become trapped in it and transform into osteocytes, which help maintain the bone. The newly formed bone tissue then undergoes further remodeling and growth, leading to the formation of a strong and structured bone. This process is crucial for the proper development of the skeletal system.