Final answer:
In biology, intramembranous ossification is the process by which bone forms directly from mesenchyme connective tissue. It involves the development of compact and spongy bone within condensed mesenchyme, forming flat bones like the face and cranial bones.
Step-by-step explanation:
Intramembranous ossification is the process by which bone forms directly from sheets of mesenchymal (undifferentiated) connective tissue. This process involves the development of compact and spongy bone within condensed mesenchyme, which is arranged in sheetlike layers that resemble membranes. Examples of bones that are formed via intramembranous ossification include the flat bones of the face, most of the cranial bones, and the clavicles (collarbones).