The Skeletal and Muscular Systems

Introduction

The skeletal and muscular systems are fundamental to human anatomy and physiology, providing structure, support, movement, and protection for the body. Together, they form the musculoskeletal system, which is subject to various injuries, diseases, and disorders. Understanding the medical terminology associated with these systems is essential for students in health sciences and medical fields.

Anatomy and Physiology: Word Parts

Common Word Roots and Combining Forms

• arthr/o: joint

• articul/o: joint

• burs/o: bursa (fluid-filled sac)

• carp/o: wrist

• chondr/o: cartilage

• condyl/o: knuckle

• cost/o: rib

• cran/o, crani/o: skull

• fasci/o: fascia (band of connective tissue)

• femor/o: femur (thigh bone)

• fibul/o: fibula (lower leg bone)

• ili/o: ilium (pelvic bone)

• ischi/o: ischium (pelvic bone)

• muscul/o, my/o, myos/o: muscle

• myel/o: bone marrow or spinal cord (context-dependent)

• oste/o: bone

• patell/o: patella (kneecap)

• phalang/o: phalanges (finger or toe bones)

• radi/o: radius (forearm bone)

• sacr/o: sacrum (base of spine)

• skelet/o: skeleton

• spondyl/o, vertebr/o: vertebra

• stern/o: sternum (breastbone)

• ten/o, tendon/o: tendon

• synov/o, synovi/o: synovial membrane

Overview of the Musculoskeletal System

Structure and Function

• Bones provide structural support, protect organs, store minerals (especially calcium), and produce blood cells in the bone marrow.

• Muscles enable movement by contracting and pulling on bones.

• Tendons connect muscles to bones, transmitting the force needed for movement.

• Ligaments connect bones to other bones, stabilizing joints.

Figure: Anatomy of a long bone, showing the diaphysis, epiphyses, compact and spongy bone, medullary cavity, periosteum, and other key structures.

Figure: The human skeleton, anterior view, labeling major bones.

Figure: The major muscles of the human body, anterior view.

Medical Terms: Building and Understanding

Prefixes, Suffixes, and Combining Forms

• Prefixes: a- (without), brady- (slow), dys- (bad, difficult), hyper- (excessive)

• Suffixes: -algia (pain), -dynia (pain), -ia (condition), -y (process), -itis (inflammation), -malacia (softening), -osis (condition), -plasty (surgical repair), -rrhaphy (suturing), -tomy (cutting, incision)

• Combining forms are used to link word roots and suffixes/prefixes, making complex medical terms.

Example: Osteoarthritis = oste/o (bone) + arthr (joint) + itis (inflammation) = inflammation of the bone and joint.

Signs and Symptoms of the Skeletal and Muscular Systems

Common Terms and Their Meanings

• Arthralgia: Joint pain

• Ataxia: Lack of muscle coordination

• Atrophy: Wasting away or decrease in size of muscle or tissue (a- = without, troph/o = development, -y = process of)

• Bradykinesia: Slow movement

• Decalcification: Loss of calcium from bone

• Dyskinesia: Difficult or abnormal movement

• Dystrophy: Abnormal development or growth of tissue

• Hypertrophy: Increase in size of an organ or tissue

• Myalgia: Muscle pain

• Tenodynia: Tendon pain

Diseases and Disorders of the Skeletal and Muscular Systems

Key Terms and Conditions

• Achondroplasia: A genetic disorder causing dwarfism due to abnormal cartilage formation (a- = without, chondr/o = cartilage, -plasia = formation).

• Ankylosis: Stiffness or fusion of a joint.

• Arthritis: Inflammation of a joint (arthr = joint, -itis = inflammation). Types include:

  • Osteoarthritis (OA): Degenerative joint disease due to wear and tear.

  • Rheumatoid arthritis (RA): Autoimmune inflammation of joints.

  • Septic arthritis: Joint inflammation due to infection.

• Bursitis: Inflammation of a bursa.

• Carpal tunnel syndrome (CTS): Compression of the median nerve in the wrist.

• Duchenne muscular dystrophy (DMD): Genetic disorder causing progressive muscle weakness.

• Epicondylitis: Inflammation of the tissues around the elbow.

• Fibromyalgia: Chronic widespread muscle pain and tenderness.

• Fracture: Break in a bone. Types include:

  • Simple (closed)

  • Compound (open)

  • Comminuted (bone shattered)

  • Compression (bone crushed)

  • Greenstick (incomplete, common in children)

  • Oblique, Pathological, Spiral, Transverse

• Gout: Metabolic disorder causing uric acid crystal accumulation in joints, often the big toe.

• Herniated disk: Protrusion of an intervertebral disk, causing nerve compression and pain.

• Kyphosis: Exaggerated posterior curvature of the thoracic spine (humpback).

• Lordosis: Exaggerated anterior curvature of the lumbar spine.

• Scoliosis: Lateral curvature of the spine.

• Osteomalacia: Softening of bones due to vitamin D deficiency (oste/o = bone, -malacia = softening).

• Osteoporosis: Condition of porous bones, leading to increased fracture risk (oste/o = bone, por = porous, -osis = condition).

• Osteosarcoma: Malignant bone tumor.

• Sprain: Injury to a ligament, classified by degree of severity.

• Strain: Injury to a muscle or tendon.

• Tendonitis: Inflammation of a tendon.

• Tenosynovitis: Inflammation of a tendon sheath.

Treatments, Procedures, and Devices

Common Procedures and Their Purposes

• Arthrocentesis: Aspiration of fluid from a joint cavity, often to relieve swelling or diagnose joint disorders.

• Arthrodesis: Surgical fixation of a joint (arthr/o = joint, -desis = surgical fixation).

• Arthrogram: X-ray image of a joint after injection of contrast medium.

• Arthroscopy: Visual examination of a joint using an arthroscope; often used for minimally invasive surgery.

• Electromyography (EMG): Recording the electrical activity of muscles to diagnose neuromuscular disorders (electr/o = electricity, my/o = muscle, -graphy = recording process).

• Fracture reduction: Realignment of broken bones. Types include:

  • Closed reduction: Non-surgical realignment, often with casting.

  • Open reduction: Surgical realignment, may involve internal or external fixation devices.

• Orthotics: Use of devices to support or correct musculoskeletal function.

• Prosthesis: Artificial device to replace a missing body part.

Abbreviations

Common Abbreviations in Musculoskeletal Medicine

Summary Table: Common Disorders and Procedures

Conclusion

Mastering the terminology of the skeletal and muscular systems is essential for effective communication in healthcare. Understanding word parts, common diseases, procedures, and abbreviations provides a strong foundation for further study in medical and allied health fields.