Study guide: The Musculoskeletal System

📋 Course Outline

1. Skeleton Functions
2. Bone Types and Features
3. Joint Types and Movement

📖 1. Skeleton Functions

📝 Essential Points

• The skeleton supports and protects the body, produces blood cells, stores essential minerals such as calcium, and provides shape and movement.

📖 2. Bone Types and Features

🔑 Key Concepts & Definitions

• Long bones: Long bones are longer than they are wide and have a thick outer layer for protection; examples include the femur, humerus, tibia, and fibula.
• Short bones: Small, cube-shaped bones that are nearly equal in length and width and provide support while allowing intricate movement; examples occur in the wrists, ankles, and hands.
• Flat bones: Broad, thin bones made of two thin layers of bone that protect vital organs, including the heart, lungs, and brain.
• Sesamoid bones: Bones that relieve tension in muscles and tendons, allow increased weight-bearing, and protect muscles from strain; examples occur in the toes and feet.
• Irregular bones: Bones with complex, varied shapes that do not fit other bone categories; their shapes provide structural support and protection for vital organs, and the spine is an example.

📖 3. Joint Types and Movement

🔑 Key Concepts & Definitions

• Fibrous joints: Immovable or slightly movable joints in which bones are held together by dense collagenous connective tissue, without a joint cavity; they occur between the bones of the skull.
• Cartilaginous joints: Joints that connect bones by cartilage and allow limited movement, offering more movement than fibrous joints but less than highly movable joints.
• Synovial joints: Freely movable articulations between two bones, characterized by a fluid-filled joint cavity; examples include the shoulder, knee, and elbow.

📝 Essential Points

• Synovial fluid lubricates joint surfaces, absorbs shock, and nourishes cartilage in synovial joints.

📊 Synthesis Tables

Joint Types Compared