long bone- membranes Periosteum

Periosteum

White, double-layered membrane, Covers external bone surfaces

Fibrous layer

outer layer of dense irregular CT, Secured to bone matrix by Sharpey’s fibers

Sharpey’s fibers

bone matrix

Osteogenic layer

inner layer abutting bone, Contains osteogenic stem cells that give rise to most bone cells, Also serves as anchoring points for tendons and ligaments

nutrient foramen

a small tunnel through the cortex of a long bone containing a nutrient artery that supplies the bone