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Muscles and Body Movements

Muscles and Body Movements. Movement results when a muscle moves an attached bone Muscles are attached to at least two points Origin (“anchor”) Attachment to a immoveable bone Insertion Attachment to an movable bone. Muscles and Body Movements. Types of Ordinary Body Movements. Flexion

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Muscles and Body Movements

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  1. Muscles and Body Movements • Movement results when a muscle moves an attached bone • Muscles are attached to at least two points • Origin (“anchor”) • Attachment to a immoveable bone • Insertion • Attachment to an movable bone

  2. Muscles and Body Movements

  3. Types of Ordinary Body Movements • Flexion • Decreases the angle of the joint • Brings two bones closer together • Typical of hinge joints like knee and elbow • Extension • Opposite of flexion • Increases angle between two bones

  4. Types of Ordinary Body Movements Hyperextension: results when angle is > 180 ̊

  5. Types of Ordinary Body Movements • Rotation • Movement of a bone around its axis • Common in ball-and-socket joints • Example is when you move the atlas bone around the axis bone of your vertebra • shake your head “no”

  6. Types of Ordinary Body Movements Midline • Abduction • Movement of a limb away from the midline • Adduction • Opposite of abduction • Movement of a limb toward the midline

  7. Types of Ordinary Body Movements • Circumduction • Combination of flexion, extension, abduction, and adduction • Common in ball-and-socket joints

  8. Special Movements • Dorsiflexion • Lifting the foot so that the superior surface approaches the shin (pointing toes upward) • Plantar flexion • Depressing the foot (pointing the toes downward)

  9. Special Movements • Inversion • Turn sole of foot medially • Eversion • Turn sole of foot laterally

  10. Special Movements • Supination • Forearm rotates so palm faces up (anterior side) • Pronation • Forearm rotates so palm faces down (posterior side)

  11. Special Movements • Opposition • Move thumb to touch the tips of other fingers on the same hand

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