Skeletal System

Axial skeleton

Appendicular skeleton

supportst the central axis. skull, vertebral column, rib cage

arms, legs, pelvis, shoulder

Functioms: -supports the body-protects internal organs- assist movement-stores minerals-site of cell blood formation

Bone(mineral salta, calcium, phosphorus)solid network of living cells and protein fibers sorrounded by calcium salts.

Structure

POSTERIUM tough layer of connective tissue

COMPACT BONE contain nerves and blood vessels in Haversian canals

SPONGY BONE can support a lot of force and has red bone marrow . at the end of long bones

BONE MARROW red- contain stem cells that produce most type of blood cells. yellow- store fat

Cartilage - connective tissue

ossification. 7 months before birth

osteoblasts replace cartilage

osteocytes. mantain mineral in one tissue

remains in flexible oarts like nose aears and knee

osteoclasts. break down bone minerals

joints. place where bones meet , contain connective tissue.

Immovable(fixed joints)No movement. where skull bones meet.

Slightly Movabble. small amout of movement. separated from each other, between vertebrae, lower leg

freely movable joints. 2+ directions

Pivot. rotate around one and other. arm and head

Saddle. slide in 2 directions. thumb

Ball-and-Socket. many directions shoulders and jips.

Hinge. back and forth. elbows, knees and ankles