Milia are small, white cysts commonly seen around the cheeks. Overview. Milia are commonly found on the skin of people of all ages. They are formed when keratin (a substance produced by the skin) becomes entrapped beneath the outer layer of the skin, forming a tiny cyst. An individual milium (the singular of milia) is formed at the base of a hair follicle or sweat gland.
The basic first level structure of cortical bone are osteons. Trabecular bone is much more porous with porosity ranging anywhere from 50% to 90%. It is found in the end of long bones (see picture above), in vertebrae and in flat bones like the pelvis. Its basic first level structure is the trabeculae. III.
Another major role of the skeletal system is to provide mobility. Tendons, bones, joints, ligaments and muscles work in concert to produce various movements. The skeleton is composed of fibrous and mineralized connective tissues that give it firmness and flexibility.It consists of bone, cartilage, tendons, joints, and ligaments. Bones are a major component of the skeletal system.Bones that comprise the human skeleton are divided into two groups. They are the axial skeletal bones and appendicular skeletal bones.he skeleton is composed of fibrous and mineralized connective tissues that give it firmness and flexibility. It consists of bone, cartilage, tendons, joints, and ligaments. Bones are a major component of the skeletal system.