What Is the Haversian System?
Harvard system
Harvard system
- Chinese name
- Harvard system
- Foreign name
- Harvard system
- Harvard system
- The Harvard system exists in the cortex of the bone along the axial direction of the bone, and there are communication branches between each other. The Forman's canal is close to the inside and outside of the cortex, and it exists at a right angle to the bone in an oblique line. On the cross section of the bone, the Harvard's canal is surrounded by 8 to 10 concentric bone laminae, forming a continuous tubular system in the cortex that contains the nutritional blood vessels of the bone. This bone laminar and its central lumen form The Harvard system.
- Harvard system
- The Harvard system exists in the cortex of the bone along the axial direction of the bone, and there are communication branches between each other. The Forman's canal is close to the inside and outside of the cortex, exists at an oblique angle to the bone direction, and communicates with the Harvard's canal. On the cross section of the bone, the Harvard's canal is surrounded by 8 to 10 concentric bone laminae, forming a continuous tubular system in the cortex that contains the nutritional blood vessels of the bone. This bone laminar and its central lumen form The Harvard system.
- Bone is divided into compact bone and cancellous bone. Dense bone is composed of neatly arranged bone plates. The bone plates arranged on the bone surface are outer ring bone plates. The inner ring bone plates are arranged around the bone marrow cavity. Many concentric circles are formed between the inner and outer bone plates. The arranged bone plate is called the Havers's system, and the central tube is called the Havers's tube.
- Bone compact unit. The vasculature with the majority of blood vessels running through the long bones as its center. The central tube with a diameter of 20-100 micrometers as the vascular access is called the Harvard's canal: it has the Harvard's bone plate arranged at the center, that is, several The bone matrix from layer to layer 20-30 has a concentric circle structure, in which a layered bone cavity that can accommodate most bone cells is distributed. The collagen fibers in the Harvard's bone plate are also arranged in parallel layers at an angle to the Harvard's canal axis. In the adjacent bone plates, the arrangement direction of the fibers forms a right angle with each other. Therefore, strong multiple inflections can be seen in the bone plate. No reflexion can be seen in the material buried between the bone plates. The Harvard's canal communicates with the outer surface or lumen of the bone through the Volkmann's canal in the basal bone plate. These piping systems are used to transport substances necessary for bone metabolism.
- The synthesis of the Harvard's canal and Harvard's bone plate is called the Harvard's system