IndietroBones and Skeletal Tissues: Structure, Types, and Development
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Chapter 6: Bones and Skeletal Tissues (Sections 6.1 – 6.5)
Skeleton Components
The human skeleton is a complex framework composed of bones, ligaments, and cartilage. These components work together to provide structure, protection, and movement for the body.
Bones: Rigid organs that form the main structure of the skeleton. Example: Femur (thighbone), Fibula.
Ligaments: Dense connective tissues that connect bones to other bones, stabilizing joints.
Cartilage: Flexible connective tissue found in various locations, providing cushioning and support.
Types of Cartilage
Cartilage is a specialized connective tissue found throughout the body. There are three main types, each with distinct properties and functions.
Hyaline Cartilage: Most abundant type; provides support with flexibility and resilience.
Elastic Cartilage: Contains more elastic fibers, allowing it to withstand repeated bending.
Fibrocartilage: Highly compressible and resists tension; found in areas subjected to pressure and stretch.
Table: Types of Cartilage and Their Locations
Type of Cartilage | Main Locations | Key Properties |
|---|---|---|
Hyaline | Articular surfaces of joints, costal cartilage (ribs), larynx (voice box) | Support, flexibility, smooth surfaces for joints |
Elastic | External ear, epiglottis, auditory tube | Flexible, maintains shape after bending |
Fibrocartilage | Intervertebral discs, menisci of knee | Resists compression and tension |
Cartilage: Hyaline
Hyaline cartilage is the most common type in the body. It covers and protects the ends of bones in movable joints, providing a smooth surface for movement and reducing friction.
Locations: Articular cartilage (joints), costal cartilage (ribs), respiratory structures (larynx, trachea).
Function: Supports, cushions, and protects bones at joints.
Cartilage: Elastic
Elastic cartilage is found in structures that require flexibility and repeated bending.
Locations: External ear, epiglottis (voice box), auditory (Eustachian) tube.
Function: Maintains shape and flexibility of these structures.
Cartilage: Fibrocartilage
Fibrocartilage occurs in sites that are subject to both pressure and stretch.
Locations: Menisci of the knee, intervertebral discs.
Function: Provides strong support and can withstand heavy pressure.
Summary Table: Cartilage Types and Functions
Type | Function | Example Location |
|---|---|---|
Hyaline | Support, reduce friction | Articular cartilage of joints |
Elastic | Flexibility, maintain shape | External ear |
Fibrocartilage | Shock absorption, tensile strength | Intervertebral discs |
Key Terms
Articular cartilage: Hyaline cartilage covering bone ends in joints.
Meniscus: Crescent-shaped fibrocartilage in the knee.
Epiglottis: Elastic cartilage structure that covers the larynx during swallowing.
Additional info:
Cartilage is avascular (lacks blood vessels) and receives nutrients by diffusion.
Chondrocytes are the main cell type in cartilage, residing in spaces called lacunae.
Cartilage growth occurs by two mechanisms: appositional growth (from the outside) and interstitial growth (from within).
