The Skeletal and Muscular Systems: Medical Terminology, Anatomy, Disorders, and Treatments

The Skeletal and Muscular Systems

Overview of the Musculoskeletal System

The musculoskeletal system is composed of bones, muscles, tendons, and ligaments. It provides structural support, enables movement, and protects vital organs. This system is susceptible to various injuries, inherited disorders, and diseases.

• Bones: Provide support, store calcium, and produce blood cells in the bone marrow.

• Muscles: Facilitate movement by contracting and relaxing.

• Tendons: Connect muscles to bones.

• Ligaments: Connect bones to other bones at joints.

Medical Terminology: Word Parts

Common Word Roots, Prefixes, and Suffixes

Understanding medical terms for the skeletal and muscular systems requires knowledge of common word parts:

• arthr/o: joint

• my/o, myos/o: muscle

• oste/o: bone

• chondr/o: cartilage

• tend/o, ten/o, tendon/o: tendon

• -itis: inflammation

• -algia, -dynia: pain

• -malacia: softening

• -plasty: surgical repair

• -ectomy: excision, removal

Prefixes such as a- (without), brady- (slow), hyper- (excessive), and dys- (difficult, abnormal) modify the meaning of root words.

Major Diseases and Disorders

Common Conditions Affecting the Skeletal and Muscular Systems

• Achondroplasia: A genetic disorder causing abnormal cartilage formation, resulting in dwarfism.

• Arthritis: Inflammation of joints. Types include:

  • Osteoarthritis (OA): Degenerative joint disease due to cartilage breakdown.

  • Rheumatoid arthritis (RA): Autoimmune inflammation of synovial membrane.

  • Septic arthritis: Joint infection.

• Bursitis: Inflammation of a bursa (fluid-filled sac near joints).

• Carpal Tunnel Syndrome (CTS): Compression of the median nerve in the wrist.

• Fractures: Breaks in bone, classified as simple, compound, comminuted, compression, greenstick, oblique, pathological, spiral, or transverse.

• Gout: Accumulation of uric acid crystals in joints, often affecting the big toe.

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

• Kyphosis, Lordosis, Scoliosis: Abnormal spinal curvatures.

• Osteoporosis: Loss of bone density, increasing fracture risk.

• Osteomalacia: Softening of bones due to vitamin D deficiency.

• Muscular Dystrophy: Group of genetic diseases causing muscle weakness and degeneration.

Signs and Symptoms

Common Clinical Manifestations

• Arthralgia: Joint pain

• Ataxia: Lack of muscle coordination

• Atrophy: Wasting away of muscle tissue

• Bradykinesia: Slowness of movement

• Decalcification: Loss of calcium from bone

• Dyskinesia: Difficult or abnormal movement

• Dystrophy: Abnormal development, often referring to muscle

• Hypertrophy: Increase in muscle size

• Myalgia: Muscle pain

• Tenodynia: Tendon pain

Treatments, Procedures, and Devices

Common Interventions for Skeletal and Muscular Disorders

• Arthrocentesis: Aspiration of fluid from a joint cavity to relieve swelling or obtain fluid for analysis.

• Arthrodesis: Surgical fixation of a joint.

• Arthroplasty: Surgical repair or replacement of a joint.

• Arthroscopy: Visual examination of a joint using an arthroscope.

• Fracture Reduction: Realignment of broken bones, either closed (without surgery) or open (with surgery).

• Internal/External Fixation: Use of devices to stabilize fractured bones during healing.

• Electromyography (EMG): Recording of muscle electrical activity to diagnose neuromuscular disorders.

• Orthotics and Prosthetics: Devices to support, align, or replace parts of the musculoskeletal system.

• NSAIDs: Nonsteroidal anti-inflammatory drugs used to reduce pain and inflammation.

Selected Abbreviations

Abbreviation	Meaning
ACL	Anterior cruciate ligament
CTS	Carpal tunnel syndrome
DJD	Degenerative joint disease
DMD	Duchenne muscular dystrophy
EMG	Electromyography
HNP	Herniated nucleus pulposus
NSAIDs	Nonsteroidal anti-inflammatory drugs
OA	Osteoarthritis
RA	Rheumatoid arthritis
ROM	Range of motion
SCI	Spinal cord injury
THR	Total hip replacement
TKA/TKR	Total knee arthroplasty/replacement
TMJ	Temporomandibular joint

Summary Table: Types of Bone Fractures

Type	Description
Simple	Bone breaks cleanly but does not penetrate the skin
Compound	Bone ends penetrate the skin
Comminuted	Bone shatters into several pieces
Compression	Bone is crushed
Greenstick	Bone breaks incompletely, common in children
Oblique	Break has a curved or sloped pattern
Pathological	Break caused by disease-weakening bone
Spiral	Break spirals around the bone, often from twisting injury
Transverse	Break is straight across the bone

Key Equations and Concepts

• Calcium Homeostasis: Bones act as a reservoir for calcium, which is regulated by hormones such as parathyroid hormone (PTH) and calcitonin.

• Muscle Contraction: Involves the sliding filament theory, where actin and myosin filaments slide past each other to shorten the muscle fiber.

$\text{Ca}^{2+} + \text{PO}_4^{3-} \rightarrow \text{Hydroxyapatite (bone mineral)}$

$\text{Muscle force} = \text{Cross-sectional area} \times \text{Tension per unit area}$

Additional info: This guide integrates medical terminology, anatomy, pathology, and clinical procedures relevant to the skeletal and muscular systems, as required for foundational courses in anatomy and physiology (ANP).