Skeletal System Overview

Cranium

Cranium

Mandible

Rib Cage

Sternum

Vertebral Column

Clavicle

Scapula

Humerus

Ulna

Radius

Carpals

Metacarpals

Phalanges (C)

Phalanges (T)

Ilium

Femur

Patella

Tibia

Fibula

Tarsals

Metatarsals

Ossification

the hardening of bones through calcification (deposits of calcium)

When does ossification occur?

3rd month of life during fetal development; completed by late adolescence

The adult human skeleton is made of up ____ bones

206

Functions of the skeletal system

• serves as framework

• protects internal structures

• stores calcium

• produces blood cells

• allows flexibility

Axial Bones

• cranium

• mandible

• vertebral column

• ribs

• sternum

Appendicular Bones

• arms, hands

• legs, feet

• scapula

• clavicle

• pelvic bones

Long bones

Humerus, radius, ulna, femur, tibia, fibula

Short bones

Wrist & hand bones, ankle & feet bones

Flat bones

Skull, sternum & ribs, shoulder blades

Irregular bones

Face, spine, pelvic bones

Joint

the point where two bones meet

Immovable joint

Cranium

Slightly Movable Joints

• vertebral joints

• ribs

• hips

Freely Movable

• shoulder joints

• knee, ankle joints

• elbow, wrist & finger joints

Ligament

connect to bone and hold bone together

Cartilage

connective tissue that acts as a cushion between the bones of joints