What is the metaphysis of a long bone?
The metaphysis is the trumpet-shaped end of long bones. It has a thinner cortical area and increased trabecular bone and is wider than the corresponding diaphyseal part of the bone. Periosteal bone forms in the area joining the diaphysis to the epiphysis.
What is the function of the metaphysis?
function in bone structure This region (metaphysis) functions to transfer loads from weight-bearing joint surfaces to the diaphysis. Finally, at the end of a long bone is a region known as an epiphysis, which exhibits a cancellous internal structure and comprises the bony substructure of the joint surface.
What is the function of distal epiphysis?
The distal epiphysis is made up of spongy bone, which is bone with tiny holes similar to lattices. These holes are filled with connective tissue and bone marrow. The distal epiphysis is also is covered in articular cartilage, enabling bones to move at the joints without grinding on each other.
What is the difference between the distal and the proximal epiphysis?
The proximal epiphysis is the end of the long bone closest to the center of the body. The distal epiphysis is located at the end of the long bone that is farther away from the center of the body.
How do you define metaphysis?
The metaphysis is the region where the epiphysis joins the diaphysis; in a growing bone this corresponds to the calcified layer of the epiphyseal plate together with the interdigitating bone (see Figure 4.19). The interface between the hypertrophic and calcified layers is sometimes referred to as the tidemark.
What is metaphysis plate?
FMA. 24014. Anatomical terminology. The metaphysis is the neck portion of a long bone between the epiphysis and the diaphysis. It contains the growth plate, the part of the bone that grows during childhood, and as it grows it ossifies near the diaphysis and the epiphyses.
What is definition of metaphysis?
The metaphysis is the region where the epiphysis joins the diaphysis; in a growing bone this corresponds to the calcified layer of the epiphyseal plate together with the interdigitating bone (see Figure 4.19). In most long bones, one end usually fuses with the shaft before the other end.
Why is the metaphysis important?
It contains the growth plate, the part of the bone that grows during childhood, and as it grows it ossifies near the diaphysis and the epiphyses. In an adult, the metaphysis functions to transfer loads from weight-bearing joint surfaces to the diaphysis.
What is the main function of the epiphyseal plate?
The epiphyseal growth plate is the main site of longitudinal growth of the long bones. At this site, cartilage is formed by the proliferation and hypertrophy of cells and synthesis of the typical extracellular matrix.
What is a distal diaphysis?
The diaphysis is the long central portion of the tibia that attaches the proximal or rear portion of the bone to the distal or far part of the bone. Diaphyseal fractures can occur due to direct impact or a twisting or falling injury.
Are the distal and proximal ends of the bone?
Fibrous tissue that connects bones or cartilage to strengthen and support joints. The end of the bones are often refered to by the Proximal end (towards the main body) or the Distal end (away from the main body), e.g. the proximal femur is the top end of the thigh bone.
What are the proximal and distal widened ends of a long bone called?
A long bone has two parts: the diaphysis and the epiphysis. The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The wider section at each end of the bone is called the epiphysis (plural = epiphyses), which is filled with spongy bone.
What causes the widening of the distal femoral metaphyses?
Symmetric and marked widening of the distal femoral metaphyses with bone infarcts. Diffuse osteopenia. Thin and porous cancellous bone. Hemolytic anemia due to enzymatic defects in heme synthesis, which results in the accumulation and increased excretion of porphyrins or porphyrin precursors.
Where does the fracture of the distal femur occur?
Distal femur fractures are fractures extending from the distal metaphyseal-diaphyseal junction of the femur to the articular surface of the femoral condyles. They can occur in both younger patients (from high energy trauma) and in older patients (as frailty or pathological fractures)
When does the Erlenmeyer flask shape describe the distal femur?
The Erlenmeyer flask shape describes the distal femur when the metaphysis is broad and the transition zone of the diaphysis is wide ( Fig. 5.67 ). The Erlenmeyer flask shape is always the result of a pathologic process: either failure of remodeling (bone dysplasia) or expansion of the marrow space (infiltrative processes).
Can a metaphysis extend into a diaphysis?
Healing with periosteal new bone formation may extend into the diaphysis. Normal width of the native metaphysis may sometimes be discerned within the periosteal new bone of the healing fracture. Follows metaphyseal fracture of infancy (child abuse, osteogenesis imperfecta).