ANATOMY

Detailed explanation-1: -Intramembranous ossification involves the replacement of sheet-like connective tissue membranes with bony tissue. Bones formed in this manner are called intramembranous bones.

Detailed explanation-2: -Intramembrous bones: Bones that originate between sheetlike layers of connective tissues. Endochondral bones: Bones that begin as masses of cartilage that bone tissue later replaces.

Detailed explanation-3: -Intramembranous ossification directly converts the mesenchymal tissue to bone and forms the flat bones of the skull, clavicle, and most of the cranial bones.

Detailed explanation-4: -During the process of intramembranous ossification (also referred to as desmal ossification) mesenchymal cells differentiate into osteoblasts, which directly start to deposit bone. This mechanism generates the flat bones of the skull and the lateral clavicles.

Detailed explanation-5: -In endochondral bones, ossification occurs within the cartilaginous template and also within the surrounding fibroblastic perichondral sheath to form the bone collar. Intramembranous bones develop via direct osteoblast differentiation within the mesenchyme.