Skeletal System

Two Types of Systems In the human, the skeletal system is an endoskeleton. This means our support system is internal. Other organisms have exoskeletons, or outer skeletons.

Important Head Bones Cranium – skull, protects the brain Mandible – jaw bone Hyoid – protects your vocal chords

Important Chest Bones Clavicle – collar bone Sternum – bone that holds the rib cage together Ribs – protect the heart Spine – protects the nervous system Scapula – shoulder blade Clavicle Spine

Important Arm Bones Humerus – attaches arm to shoulder Radius – arm bone (larger bone) Ulna – arm bone Carpals – wrist bones Metacarpals – hand bone Phalanges – finger bones

Important Leg Bones Pelvis – supports the back and legs Femur – bone that connects to the pelvis Patella – knee cap Tibia – leg bone (larger) Fibula – leg bone Tarsals – ankle bones Metatarsals – foot bones Phalanges – toes Calcaneous – heel bone Malleoulus – Ankle bone

Axial Skeleton 80 Bones

Appendicular Skeleton 126 Bones

Bones Solid network of living cells and protein fibers surrounded by deposits of calcium salts. Compact bone – hard outer bone surface Spongy bone - inside of bone, produces blood cells Periosteum – thin coating on the bone Haversian Canals – run blood through the bone

Bone Marrow Yellow Marrow – fat in the bone. Replaces red marrow as a person ages. Red Marrow – forms blood cells. Very predominant in children