Joints Where two bones meet Some are immovable

Joints Where two bones meet Some are immovable Movable joints have: Cartilage – smooth, protects bone Ligaments – strong bands with some stretch, hold bones together Fluid – lubricates, keeps cartilage from drying out.

Types of Bones of the Cranium Wrist and Ankle bones Form follows function

Anatomy of a Bone Outer Covering

Outer Covering Has cells that produce new bone Outer Covering Muscles attach here Thin and tough

Compact Bone Is dense and rigid Made mostly of calcium and minerals Spongy Bone Full of spaces Filled with red marrow Found in the ends of long bones and between flat bones

Marrow Red Bone Marrow Located in Spongy Bone Where Blood Cells are Produced Many blood vessles Yellow Bone Marrow Located in the shaft Produces Fat, Cartilage, and Bone Few Blood Vessels

Bone Cells Remove and replace minerals in the skeleton Nucleus Space Your skeleton is completely replaced every ten years!!! Minerals

Blood Supply All cells need nutrients and oxygen. Blood delivers nutrients, including calcium Bone cells absorb calcium and deposit it around themselves to build new bone Calcium is what makes bones hard.

Growing Bones All bones have growth centers Growth centers are soft until bone is done growing, then they harden Most bones have hardened by age 25

Growing Bones Growth centers are fuzzy on an x-ray