Postural and Primitive Reflexes Quiz
24 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What primarily mediates primitive reflexes in infants?

  • Midbrain
  • Brainstem (correct)
  • Spinal cord
  • Cerebral cortex
  • Which type of postural reflex is associated with the position of the head relative to the horizontal plane?

  • Tonic labyrinthine reflex (correct)
  • Righting reflex
  • Moro reflex
  • Tonic neck reflex
  • Which structure integrates the tonic neck reflex?

  • Cerebellum
  • Midbrain
  • Cortex
  • Medulla oblongata (correct)
  • How do upper motor neuron lesions primarily affect muscle tone?

    <p>Increase muscle tone (B)</p> Signup and view all the answers

    Which of the following describes decerebrate posturing?

    <p>Extension of the arms and legs (C)</p> Signup and view all the answers

    What role does the righting reflex serve?

    <p>To restore posture to normal (A)</p> Signup and view all the answers

    Which type of fibres are responsible for the tonic labyrinthine reflex?

    <p>Vestibulospinal tracts (B)</p> Signup and view all the answers

    What is a key characteristic of postural reflexes compared to primitive reflexes?

    <p>They are related to basic body positioning (D)</p> Signup and view all the answers

    What purpose does posture serve in the body?

    <p>To maintain an upright, balanced position (C)</p> Signup and view all the answers

    Which type of muscles are primarily concerned with postural adjustments?

    <p>Axial and proximal limb muscles (B)</p> Signup and view all the answers

    Which descending motor pathways are involved in posture regulation?

    <p>Medullary and pontine reticulospinal tracts (B)</p> Signup and view all the answers

    What is the definition of muscle tone?

    <p>The resistance of a muscle to stretch. (D)</p> Signup and view all the answers

    How do the reticular nuclei in the brainstem contribute to posture?

    <p>They regulate both excitatory and inhibitory signals. (D)</p> Signup and view all the answers

    What is the role of the ventromedial pathways in posture?

    <p>They supply bilateral proximal muscles for maintaining posture. (C)</p> Signup and view all the answers

    Which reflex is primarily responsible for maintaining posture during voluntary movement?

    <p>Myotatic reflex (C)</p> Signup and view all the answers

    What type of pathways control fine movements at the distal ends of limbs?

    <p>Lateral pathways (A)</p> Signup and view all the answers

    What type of afferent fibers are involved in the tonic stretch reflex?

    <p>Ia and II afferent fibers (C)</p> Signup and view all the answers

    What is the main function of the reticular formation in relation to posture?

    <p>Regulating muscle tone and posture support (B)</p> Signup and view all the answers

    What role do gamma motor neurons (γMN) play in muscle spindle functionality?

    <p>They adjust the sensitivity of muscle spindle. (D)</p> Signup and view all the answers

    Which function does the vestibular system relate to in the context of posture?

    <p>Monitoring body position and balance (A)</p> Signup and view all the answers

    Which of the following describes a characteristic feature of upper motor neuron lesions?

    <p>Increased deep tendon reflexes (B)</p> Signup and view all the answers

    What is decerebrate rigidity characterized by?

    <p>Extended posture of the limbs (B)</p> Signup and view all the answers

    Which descending motor pathway is responsible for activating both alpha and gamma motor neurons simultaneously?

    <p>Reticulospinal tract (B)</p> Signup and view all the answers

    What is the primary function of the myotatic reflex in relation to muscle tone?

    <p>To maintain posture by contracting the muscle (C)</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser