Skeletal System

1. Structural Components

1.1. Bones

1.1.1. Compact

1.1.1.1. Osteons

1.1.1.1.1. Central canal surround by concentric lamellae

1.1.1.1.2. Osteocytes sitting lacunae connected by canaliculi

1.1.1.2. Cells surrounded by extracellular matrix

1.1.1.2.1. Osteoid - organic component = collagen and ground substance (proteogycans and glycoproteins)

1.1.1.2.2. Inorganic component = hydroxyapatite (calcium phosphate and calcium hydroxide)

1.1.2. Spongy

1.1.2.1. Trabeculae

1.1.2.1.1. Filled with bone marrow

1.1.2.2. Parallel lamellae

1.1.3. Shapes of Bones

1.1.3.1. Short

1.1.3.2. Long

1.1.3.2.1. Epiphysis

1.1.3.2.2. Diaphysis

1.1.3.2.3. Metaphysis

1.1.3.3. Flat

1.1.3.3.1. Contains diploe

1.1.3.4. Irregular

1.1.4. Periosteum

1.1.4.1. Surrounds outside of bone, contains blood vessels and nerves

1.1.4.2. Sharpey's fibers attach to bone (made of collagen)

1.1.5. Endosteum

1.1.5.1. Covers inside surface of bone

1.1.5.2. Contains osteoblasts, osteoclasts, and osteoprogenitor

1.2. Tendons

1.3. Cartilage

1.4. ligaments

2. Functions

2.1. Movement

2.2. Hemopoeisis

2.3. Protection

2.4. Mineral storage