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Human Skeletal and Muscular System Anatomy Essentials

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Human Skeletal System

The skeletal system is the framework of the human body, consisting of approximately 206 bones. It provides stiffness, flexibility, and elasticity.

Key Features

  • Unique Bone: The hyoid bone (located in the neck) is the only bone that is not articulated.
  • Bone Types:
    • Long: Femur, radius, ulna.
    • Flat: Skull bones, shoulder blades.
    • Short: Vertebrae, ear bones.

Bone Functions

  • Support and protection of internal organs.
  • Production of red blood cells.
  • Enables movement by acting as levers for muscles.
  • Storage of minerals.

Distribution of Bones

  • Head: Skull (8), face (14), hyoid (1), ear (6).
  • Vertebral Column: Cervical (7), thoracic (12), lumbar (5), sacrum (1), coccyx (1).
  • Chest: Ribs (24), sternum (1), thoracic vertebrae.
  • Upper Limbs: Girdle (4), arm (2), forearm (4), hand (54).
  • Lower Limbs: Pelvic girdle (2), thigh (2), leg (6), foot (52).

Muscular System

Muscles are active organs responsible for movement, with approximately 600 muscles in the human body.

Muscle Classification

  • Smooth: Involuntary contraction.
  • Striated:
    • Skeletal: Voluntary contraction.
    • Cardiac: Involuntary contraction.

Types of Muscle Contraction

  • Static (Isometric): No variation in muscle length.
  • Dynamic (Isotonic):
    • Concentric: Muscle shortening.
    • Eccentric: Muscle lengthening.

Muscle Fiber Types

  • Type 1 (Red): Slow-twitch fibers.
  • Type 2 (White): Fast-twitch fibers.

Functional Classification

  • Flexors: Flex and approximate.
  • Extensors: Stretch.
  • Adductors: Bring together.
  • Abductors: Separate.
  • Rotators: Rotate to either side.

Joints

Joints are the union of two or more bone or cartilage pieces.

Components

  • Joint Surfaces: The ends of the bones.
  • Hyaline Cartilage: Covers surfaces to protect against friction.
  • Stabilizing Elements: Joint capsule, ligaments, and tendons.

Mobility Types

  • No mobility, limited mobility, and mobile.

Growth Considerations

Bone growth in children is influenced by genetics, nutrition, hormones, and physical movement.

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