How do veins and arteries enter bone?

Arteries and veins enter bones through small channels called nutrient foramina. These foramina are found on the surface of the bone, and they allow blood vessels to pass into the bone to supply the cells within. The nutrient foramina are usually located near the ends of long bones, where the blood supply is most needed.

Once the blood vessels enter the bone through the nutrient foramina, they travel through a series of channels called haversian canals. These canals are lined with osteocytes, which are the cells that make up bone tissue. The haversian canals allow the blood vessels to reach all parts of the bone, even the innermost regions.

The arteries and veins that enter bone are responsible for supplying the bone tissue with oxygen and nutrients. They also remove waste products from the bone tissue. Without the blood supply from arteries and veins, bone tissue would not be able to survive.