Gamma Motor Neurons and Spinal Reflexes Quiz
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Questions and Answers

Where are the cell bodies of alpha motor neurons located?

  • In the skeletal muscle
  • In the ventral horn of the spinal cord (correct)
  • In the dorsal horn of the spinal cord
  • In the peripheral nerves

    • What is the function of gamma motor neurons?

  • To terminate on contractile region of intrafusal fibers enclosed in muscle spindles (correct)
  • To innervate sensory receptors
  • To terminate on skeletal muscle fibers
  • To initiate reflex reactions

    • What is a characteristic of reflex reactions?

  • Conscious and protective
  • Delayed and non-protective
  • Involuntary and instantaneous (correct)
  • Voluntary and delayed

    • What does a reflex consist of?

    <p>Receptor in the skin, skeletal muscle, tendon, or joint capsule</p> Signup and view all the answers

    Which nerve innervates a skeletal muscle and contains axons of both alpha and gamma motor neurons?

    <p>Gross nerve</p> Signup and view all the answers

    How do reflexes reach consciousness according to the text?

    <p>Sensory information reaches consciousness via a separate pathway</p> Signup and view all the answers

    What type of neuron is involved in the afferent limb of the muscle stretch reflex?

    <p>Pseudounipolar neuron</p> Signup and view all the answers

    Where is the cell body located for the sensory neuron in the muscle stretch reflex?

    <p>In the dorsal root ganglion (DRG)</p> Signup and view all the answers

    Which part of the spinal cord does the central process of the sensory neuron synapse with in the muscle stretch reflex?

    <p>Gray matter</p> Signup and view all the answers

    What is the purpose of tapping the patellar tendon in the quadriceps stretch reflex?

    <p>To elicit a monosynaptic stretch reflex</p> Signup and view all the answers

    Which type of fibers are stretched during the quadriceps stretch reflex?

    <p>Extrafusal fibers</p> Signup and view all the answers

    What are the receptors involved in the quadriceps stretch reflex?

    <p>Muscle spindles</p> Signup and view all the answers

    Which type of fibers are stimulated when the patellar tendon is tapped in the quadriceps stretch reflex?

    <p>Group Ia fibers</p> Signup and view all the answers

    What causes the contraction of the quadriceps in response to the quadriceps stretch reflex?

    <p>Stimulation of alpha (eta) motor neuron</p> Signup and view all the answers

    What does tapping of a tendon elicit in neurological terms?

    <p>A monosynaptic stretch reflex</p> Signup and view all the answers

    What is the function of Golgi Tendon Organs (GTOs)?

    <p>To restrict muscle overcontraction and protect the tendons</p> Signup and view all the answers

    In reciprocal inhibition, what is the role of the inhibitory interneuron?

    <p>Inhibits an alpha motor neuron that terminates in the hamstrings</p> Signup and view all the answers

    Which receptor is located at the peripheral end of the Ia fiber in reciprocal inhibition?

    <p>Muscle Spindle</p> Signup and view all the answers

    What is the primary function of autogenic inhibition (inverse myotatic reflex)?

    <p>To inhibit an alpha motor neuron that terminates in the quadriceps</p> Signup and view all the answers

    What is the role of the central process of sensory neurons Ib fiber in autogenic inhibition?

    <p>Stimulate an inhibitory interneuron</p> Signup and view all the answers

    What happens to the antagonist muscle during reciprocal inhibition?

    <p>It is inhibited and relaxes</p> Signup and view all the answers

    What is the primary function of autogenic inhibition (inverse myotatic reflex)?

    <p>To inhibit the antagonist muscle during a reflex</p> Signup and view all the answers

    What is the role of gamma motor neurons in the maintenance of muscle tone?

    <p>To maintain sensitivity of muscle spindles as effective stretch receptors</p> Signup and view all the answers

    Where are the cell bodies of alpha motor neurons located?

    <p>In the ventral horn of the spinal cord</p> Signup and view all the answers

    What is the function of reciprocal inhibition?

    <p>To inhibit the antagonist muscle during a reflex</p> Signup and view all the answers

    Which type of fibers are involved in the flexor reflex (withdrawal reflex, nociceptive reflex)?

    <p>Type C sensory fibers</p> Signup and view all the answers

    What is the mechanism of alpha-gamma co-activation?

    <p>It ensures that muscle spindles remain effective stretch receptors</p> Signup and view all the answers

    What is the role of gamma (γ) motor neurons in the muscle stretch reflex?

    <p>Activating muscle spindles to detect changes in muscle length</p> Signup and view all the answers

    Which area of the body does the quadriceps stretch reflex mainly involve?

    <p>Knees</p> Signup and view all the answers

    What is the purpose of tapping the patellar tendon in the quadriceps stretch reflex?

    <p>To activate the annulospiral endings of Group Ia fibers</p> Signup and view all the answers

    What is the term for a reflex that involves only one synapse?

    <p>Monosynaptic</p> Signup and view all the answers

    Which component of the reflex arc is responsible for transmitting sensory information from the muscle to the spinal cord?

    <p>Sensory neuron</p> Signup and view all the answers

    What type of fibers are stimulated by muscle stretch triggering sensory endings on intrafusal fibers to fire?

    <p>Intrafusal fibers</p> Signup and view all the answers

    In which part of the body are muscle spindles embedded?

    <p>Muscles</p> Signup and view all the answers

    What does the contraction of the quadriceps lead to in response to the quadriceps stretch reflex?

    <p>Extension of the leg</p> Signup and view all the answers

    Study Notes

    Motor Neurons and Reflexes

    • Alpha motor neurons have cell bodies located in the anterior gray horn of the spinal cord.
    • Gamma motor neurons function to regulate the sensitivity of muscle spindles, which are involved in muscle stretch reflexes.

    Reflex Reactions

    • Reflex reactions are characterized by rapid, unconscious responses to stimuli.
    • A reflex consists of a sensory receptor, an afferent neuron, a central integrating neuron, an efferent neuron, and an effector.

    Muscle Stretch Reflex

    • The muscle stretch reflex involves a nerve that innervates a skeletal muscle and contains axons of both alpha and gamma motor neurons.
    • The sensory neuron involved in the afferent limb of the muscle stretch reflex is a type Ia sensory neuron.
    • The cell body of the sensory neuron is located in the dorsal root ganglion.
    • The central process of the sensory neuron synapses with the alpha motor neuron in the ventral horn of the spinal cord.

    Quadriceps Stretch Reflex

    • The quadriceps stretch reflex is a specific type of muscle stretch reflex that involves the quadriceps muscle and the patellar tendon.
    • The purpose of tapping the patellar tendon is to stimulate the muscle spindle receptors, which triggers the reflex.
    • The receptors involved in the quadriceps stretch reflex are muscle spindle receptors and Golgi tendon organs.
    • The type of fibers stretched during the quadriceps stretch reflex are intrafusal fibers.
    • The type of fibers stimulated when the patellar tendon is tapped are Ia sensory fibers.
    • The contraction of the quadriceps in response to the quadriceps stretch reflex is caused by the activation of alpha motor neurons.
    • Tapping of a tendon elicits a stretch reflex in neurological terms.

    Golgi Tendon Organs (GTOs)

    • Golgi Tendon Organs (GTOs) function to regulate muscle tension and prevent muscle overload.

    Reciprocal Inhibition

    • In reciprocal inhibition, the inhibitory interneuron inhibits the antagonist muscle.
    • The receptor located at the peripheral end of the Ia fiber in reciprocal inhibition is the muscle spindle receptor.
    • The primary function of reciprocal inhibition is to coordinate muscle movements and prevent simultaneous contraction of antagonist muscles.

    Autogenic Inhibition (Inverse Myotatic Reflex)

    • The primary function of autogenic inhibition is to regulate muscle tone and prevent muscle overload.
    • The role of the central process of sensory neurons Ib fiber in autogenic inhibition is to inhibit the alpha motor neuron.
    • During reciprocal inhibition, the antagonist muscle is inhibited.

    Alpha-Gamma Co-Activation

    • The mechanism of alpha-gamma co-activation is the simultaneous activation of alpha and gamma motor neurons, which leads to muscle contraction and regulation of muscle tone.

    Muscle Tone

    • Gamma motor neurons play a crucial role in the maintenance of muscle tone.

    Flexor Reflex (Withdrawal Reflex, Nociceptive Reflex)

    • The flexor reflex involves type III and IV fibers and is a response to painful or noxious stimuli.

    Reflex Arc

    • A monosynaptic reflex is a reflex that involves only one synapse.
    • The component of the reflex arc responsible for transmitting sensory information from the muscle to the spinal cord is the sensory neuron.
    • Muscle spindles are embedded in muscles throughout the body.

    Quadriceps Stretch Reflex

    • The contraction of the quadriceps in response to the quadriceps stretch reflex leads to the extension of the knee joint.

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    Description

    Test your knowledge on gamma motor neurons and spinal reflexes with this quiz. Explore topics such as the function of gamma motor neurons, spinal reflex reactions, and the characteristics of reflex activity.

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