How are long bones formed?
How are long bones formed?
Long bones grow on a template of cartilage, in a process called endochondral ossification. Initially, the mesenchymal condensations differentiate into cartilage, populated by cells called the chondrocytes. The template then condenses and becomes hypoxic in the middle.
Do long bones start as cartilage?
Bones at the base of the skull and long bones form via endochondral ossification. In a long bone, for example, at about 6 to 8 weeks after conception, some of the mesenchymal cells differentiate into chondroblasts (cartilage cells) that form the hyaline cartilaginous skeletal precursor of the bones (Figure 6.4. 2a).
What do long and short bones develop from?
Long, short, and irregular bones develop by endochondral ossification, where cartilage is replaced by bone. Flat bones develop by intramembranous ossification, where bone develops within sheets of connective tissue.
Do bones get bigger with exercise?
Like muscle, bone is living tissue that responds to exercise by becoming stronger. Young women and men who exercise regularly generally achieve greater peak bone mass (maximum bone density and strength) than those who do not. For most people, bone mass peaks during the third decade of life.
What makes a bone a long bone in the body?
The classification of a long bone includes having a body that is longer than it is wide, with growth plates (epiphysis) at either end, having a hard outer surface of a compact bone and a spongy inner known a cancellous bone containing bone marrow.
Where does the growth of bone take place?
Long bones lengthen at the epiphyseal plate with the addition of bone tissue and increase in width by a process called appositional growth. Key Points. The epiphyseal plate, the area of growth composed of four zones, is where cartilage is formed on the epiphyseal side while cartilage is ossified on the diaphyseal side, thereby lengthening the bone.
What are the 5 types of long bones?
Long bone. The long bones are those that are longer than they are wide. They are one of five types of bones: long, short, flat, irregular and sesamoid. Long bones, especially the femur and tibia, are subjected to most of the load during daily activities and they are crucial for skeletal mobility.
How are long bones different from short bones?
A long bone has a shaft and two ends. Some bones in the fingers are classified as long bones, even though they are short in length. This is due to the shape of the bones, not their size. Long bones contain yellow bone marrow and red bone marrow, which produce blood cells. Silverstein JA, Moeller JL, Hutchinson MR. Common issues in orthopedics.