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As we know, 206 bones in total form the human skeletal framework. All these bones are classified into five types based on shape, and one of the primary types is the long bone. What is a Long Bone. As the name says, a long bone is a tough, dense bone with an elongated shape. These bones are primarily present in the legs and arms.
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). This cartilage is a flexible ...
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Long bones ossify and get longer as they grow and develop. These bones grow from their ends, known as the epiphysis, and the presence of a growth plate, or epiphyseal line, signifies that the bone is still growing. In the late teens or early twenties, a person reaches skeletal maturity. By then, all of the cartilage has been replaced by bone ...
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 chondrocytes (cartilage cells) that form the cartilaginous skeletal precursor of the bones ( Figure 2 a ).
Jul 27, 2024 · Long bone. A long bone is a type of bone characterized by its elongated shape and is typically longer than it is wide. These bones are primarily composed of a central shaft, known as the diaphysis, and two expanded ends called the epiphyses. Long bones are designed to support weight and facilitate movement by acting as levers.
The trabecular bone crowds nearby blood vessels, which eventually condense into red marrow (Figure 6.16 d). Figure 6.16 Intramembranous Ossification Intramembranous ossification follows four steps. (a) Mesenchymal cells group into clusters, and ossification centers form. (b) Secreted osteoid traps osteoblasts, which then become osteocytes.
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The long bone category includes the femora, tibiae, and fibulae of the legs; the humeri, radii, and ulnae of the arms; metacarpals and metatarsals of the hands and feet, the phalanges of the fingers and toes, and the clavicles or collar bones. The long bones of the human leg comprise nearly half of adult height.
