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Insertion, Origin, and Action of Key Muscles in Anatomy & Physiology

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Terms in this set (20)

  • What are the prime movers in the shoulder related to the rotator cuff?
    The prime movers include the rotator cuff muscles which stabilize the shoulder girdle and facilitate shoulder movement.
  • What is the role of the rotator cuff muscles?
    They stabilize the shoulder joint and assist in various shoulder movements such as rotation and abduction.
  • Which muscles act as shoulder girdle stabilizers?
    Muscles like the trapezius, rhomboids, levator scapulae, and serratus anterior stabilize the shoulder girdle.
  • What is the importance of knowing insertion and origin in muscle anatomy?
    Insertion and origin points determine muscle action and leverage during movement.
  • Name the major lower extremity joints focused on in muscle action studies.
    The hip, knee, and ankle joints are the major lower extremity joints studied.
  • What is the primary action of muscles crossing the hip joint?
    They facilitate hip flexion, extension, abduction, adduction, and rotation.
  • How do muscles crossing the knee joint contribute to movement?
    They enable knee flexion and extension essential for walking and running.
  • What actions are controlled by muscles around the ankle joint?
    Muscles control dorsiflexion, plantarflexion, inversion, and eversion of the foot.
  • Why prioritize rotator cuff muscles in anatomy studies?
    Because they are crucial for shoulder stability and preventing dislocation.
  • What is the significance of shoulder girdle stabilizers in upper limb movement?
    They provide a stable base for arm movements and maintain posture.
  • Define 'prime mover' in muscle action context.
    A prime mover is the main muscle responsible for producing a specific movement.
  • How does muscle origin differ from insertion?
    Origin is the fixed attachment point; insertion is the movable attachment point during contraction.
  • Which rotator cuff muscle is primarily responsible for external rotation?
    The infraspinatus muscle primarily facilitates external rotation of the shoulder.
  • Which rotator cuff muscle assists with internal rotation?
    The subscapularis muscle assists with internal rotation of the shoulder.
  • What is the main function of the deltoid muscle at the shoulder?
    The deltoid abducts the arm and assists in flexion and extension.
  • Name a key muscle involved in hip extension.
    The gluteus maximus is the primary muscle responsible for hip extension.
  • Which muscle group is primarily responsible for knee extension?
    The quadriceps femoris group extends the knee.
  • What muscle group controls plantarflexion at the ankle?
    The gastrocnemius and soleus muscles control plantarflexion.
  • How do the hamstrings contribute to lower limb movement?
    They flex the knee and extend the hip.
  • Why is understanding muscle insertion and origin important for clinical practice?
    It helps in diagnosing injuries and planning rehabilitation by understanding muscle function.