diaphysis

Examples of diaphysis in the following topics:

• Growth of Bone

  • On the diaphyseal side, cartilage is ossified, allowing the diaphysis to grow in length.
  • The metaphysis is the wide portion of a long bone between the epiphysis and the narrow diaphysis.
  • Capillaries and osteoblasts from the diaphysis penetrate this zone.
  • Thus, the zone of calcified matrix connects the epiphyseal plate to the diaphysis.
  • A bone grows in length when osseous tissue is added to the diaphysis.

• Bone Development

  • In long bones, chondrocytes form a template of the hyaline cartilage diaphysis.
  • This calcification prevents diffusion of nutrients into the matrix, resulting in chondrocytes dying and the opening up of cavities in the diaphysis cartilage.
  • Osteoclasts then break down some of the spongy bone to create a marrow, or medullary cavity, in the center of the diaphysis.
  • Until adolescence, hyaline cartilage persists at the epiphyseal plate (growth plate), which is the region between the diaphysis and epiphysis that is responsible for the lengthwise growth of long bones.

• Postnatal Bone Growth

  • The diaphysis and both epiphyses of a long bone are separated by a growing zone of cartilage (the epiphyseal plate).
  • When a child reaches skeletal maturity (18 to 25 years of age), all of the cartilage is replaced by bone, fusing the diaphysis and both epiphyses together (epiphyseal closure).
  • The growth in the diameter of bones around the diaphysis occurs through the deposition of bone beneath the periosteum.
  • Between the epiphysis and diaphysis (the long midsection of the long bone) lies the metaphysis, including the epiphyseal plate (growth plate).

• Stages of Bone Development

  • The diaphysis and both epiphyses of a long bone are separated by a growing zone of cartilage (the epiphyseal plate).
  • When the child reaches skeletal maturity (18 to 25 years of age), all of the cartilage is replaced by bone, fusing the diaphysis and both epiphyses together (epiphyseal closure).

• Gross Anatomy

  • Long bones grow primarily by elongation of the diaphysis (the central shaft), with an epiphysis at each end of the growing bone.
  • At the cessation of growth, the epiphyses fuse to the diaphysis, thus obliterating the intermediate area known as the epiphyseal plate or growth plate.
  • Growth occurs by a lengthening of the diaphysis. located in the center of the long bone.

• Development of Joints

  • Between the epiphysis and diaphysis (the long midsection of the long bone) lies the metaphysis, including the epiphyseal plate (growth plate) .

• Metatarsal Fracture

  • A Jones fracture is a fracture of the diaphysis of the fifth metatarsal of the foot .

• Embryonic and Fetal Bone Formation

  • The first site of ossification occurs in the primary center of ossification, which is in the middle of diaphysis (shaft).

• Bone

  • The weight of the body pushes it down near the joint, but the vertical diaphysis of the femur pushes it up at the other end.

• Connective Tissues: Bone, Adipose, and Blood

  • Compact bone is found in the shaft (or diaphysis) of a long bone and the surface of the flat bones, while spongy bone is found in the end (or epiphysis) of a long bone.