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Anatomy and Physiology

NCLEX Review Guide: Musculoskeletal Anatomy and Physiology

Bone Structure and Function

Bone Composition and Types

  • Bones consist of 65% inorganic minerals (calcium phosphate, calcium carbonate) providing hardness and 35% organic matrix (collagen) providing flexibility and tensile strength.
  • Compact bone forms the outer layer providing structural support, while spongy bone contains red bone marrow for hematopoiesis.
  • Long bones include femur, tibia, humerus; short bones include carpals and tarsals; flat bones include skull, ribs, sternum; irregular bones include vertebrae and pelvis.

Memory Aid: Bone Functions

"SHARP" - Support, Hematopoiesis, Attachment (muscle), Reservoir (minerals), Protection

Key Points

  • Osteoblasts build bone; osteoclasts break down bone; osteocytes maintain bone
  • Peak bone mass achieved by age 30; bone resorption exceeds formation after age 40

Joint Classification and Movement

Types of Joints

  • Synovial joints are freely movable with synovial fluid for lubrication (knee, shoulder, hip).
  • Cartilaginous joints are slightly movable connected by cartilage (vertebrae, pelvis).
  • Fibrous joints are immovable connected by fibrous tissue (skull sutures).

Joint Movement Types

MovementDescriptionExample
FlexionDecreasing joint angleBending elbow
ExtensionIncreasing joint angleStraightening leg
AbductionMoving away from midlineRaising arm laterally
AdductionMoving toward midlineLowering arm to side

Muscle Structure and Function

Muscle Types and Contraction

  • Skeletal muscle is voluntary, striated, and multinucleated; responsible for body movement and posture maintenance.
  • Muscle contraction occurs via sliding filament theory: actin and myosin filaments slide past each other using ATP and calcium.
  • Motor units consist of one motor neuron and all muscle fibers it innervates; smaller motor units provide fine motor control.

Clinical Application

A patient with hypocalcemia may experience muscle cramps and tetany because calcium is essential for muscle contraction. Monitor for Chvostek's and Trousseau's signs.

Key Points

  • Muscle fatigue occurs when ATP production cannot meet demand
  • Isometric contractions maintain muscle tension without joint movement
  • Isotonic contractions involve joint movement with constant muscle tension

Age-Related Changes

Musculoskeletal Aging

  • Bone density decreases due to increased osteoclast activity and decreased osteoblast function, leading to osteoporosis risk.
  • Muscle mass decreases (sarcopenia) by 3-8% per decade after age 30, affecting strength and mobility.
  • Joint cartilage thins and synovial fluid decreases, causing stiffness and reduced range of motion.

Clinical Alert

Elderly patients have increased fall risk due to decreased muscle strength, balance issues, and brittle bones. Implement fall prevention strategies immediately.

Commonly Confused Concepts

Osteoblasts vs Osteoclasts vs Osteocytes

Cell TypeFunctionMemory Tip
OsteoblastsBuild/form new bone"Blast" = Build
OsteoclastsBreak down/resorb bone"Clast" = Crush/Break
OsteocytesMaintain bone tissue"Cyte" = Cell (mature)

Common Pitfalls

  • Don't confuse abduction (away) with adduction (toward) - "ABduction = Away from Body"
  • Remember: Flexion decreases angle, Extension increases angle
  • Compact bone is dense and strong; Spongy bone is lighter with spaces for marrow

Study Tips and Memory Aids

NCLEX Success Strategies

  1. Visualize joint movements on yourself while studying
  2. Create flashcards for bone cell functions using memory aids
  3. Practice identifying long, short, flat, and irregular bones on diagrams
  4. Connect anatomy to pathophysiology (osteoporosis = decreased osteoblast activity)

Quick Check Questions

  • ☐ Can you name the three types of bone cells and their functions?
  • ☐ Do you understand the difference between isometric and isotonic contractions?
  • ☐ Can you identify age-related musculoskeletal changes?
  • ☐ Do you know the components of synovial joints?

Remember: Understanding musculoskeletal anatomy and physiology is fundamental to nursing care. You're building the foundation for excellent patient care - keep pushing forward, future nurse!

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