Inverse Myotatic Reflex Stretching Quiz: Spinal Cord Somatic Reflexes

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Questions and Answers

Which of the following is true about the reflex arc for spinal cord somatic reflexes?

Processing of information occurs before sensory info transmission.

Where are motor neurons located in the spinal cord?

Ventral (anterior) gray horn

What type of information do muscle spindles signal?

Muscle length & rate of change

Which type of motor neurons innervate the extrafusal muscle fibers?

Alpha motor neurons Signup and view all the answers

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

To detect changes in muscle length Signup and view all the answers

What is the significance of the linkage between alpha and gamma motor neurons?

Enables the muscle spindle to signal length changes over the full range of muscle length Signup and view all the answers

What is the function of the Golgi tendon organ?

To detect the force level generated by the muscle Signup and view all the answers

Which type of reflex is the SCI Stretch reflex (myotatic reflex)?

Myotatic reflex Signup and view all the answers

What is the purpose of the inverse myotatic stretch reflex?

Causes muscle relaxation of the agonist muscle before tendon damage occurs Signup and view all the answers

What happens during the flexor reflex?

The extensor muscle relaxes and the flexor muscle contracts Signup and view all the answers

What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?

Inhibit the activity of the motor neuron projecting to the flexor muscle Signup and view all the answers

Which structure signals the amount of force being applied to a muscle?

Golgi tendon organ Signup and view all the answers

What is the function of the muscle spindle?

Signals muscle length Signup and view all the answers

Where are motor neurons located in the spinal cord?

Ventral (anterior) gray horn Signup and view all the answers

What type of information do Golgi tendon organs signal?

Muscle tension Signup and view all the answers

Which of the following is true about the reflex arc for spinal cord somatic reflexes?

It involves both sensory and motor neurons Signup and view all the answers

What is the function of sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

Signal muscle spindle activation Signup and view all the answers

Which neurons innervate the extrafusal muscle fibers?

Alpha motor neurons Signup and view all the answers

What is the purpose of the inverse myotatic stretch reflex?

To prevent muscle damage from excessive force Signup and view all the answers

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

To inhibit antagonist muscle contraction Signup and view all the answers

What is the significance of the linkage between alpha and gamma motor neurons?

To regulate muscle length Signup and view all the answers

Which type of motor neurons innervate the intrafusal muscle fibers of the muscle spindle?

Gamma motor neurons Signup and view all the answers

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

To detect changes in muscle length Signup and view all the answers

What is the role of gamma motor neurons in the muscle spindle?

To adjust the level of tension in the intrafusal fibers Signup and view all the answers

Which type of gamma motor neurons modulate sensory information in a dynamic fashion?

Dynamic gamma motor neurons Signup and view all the answers

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

The firing stops Signup and view all the answers

What happens to the firing of the Ia sensory fiber when both the alpha and gamma motor neurons are stimulated?

The firing increases Signup and view all the answers

What is the function of the Golgi tendon organ?

To detect changes in muscle tension Signup and view all the answers

What type of fibers innervate the Golgi tendon organ?

Ib fibers Signup and view all the answers

What is the role of Ib afferent fibers in the autogenic inhibition reflex?

To activate inhibitory interneurons Signup and view all the answers

What is the significance of the stretch reflex?

It helps maintain muscle tone Signup and view all the answers

Which of the following is true about the myotatic stretch reflex?

The reflex includes a monosynaptic excitatory pathway from group Ia afferent fibers to alpha motor neurons Signup and view all the answers

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

To relax the flexor muscle Signup and view all the answers

Which type of reflex is the flexor reflex?

Polysynaptic Signup and view all the answers

What is the effect of the crossed extensor reflex?

The E muscle contracts and the F muscle relaxes on the opposite side of the stimulus Signup and view all the answers

What happens when a reflex is initiated with a strong stimulus?

More spinal cord segments are recruited Signup and view all the answers

What is the purpose of the Golgi tendon organ?

To control tendon tension of the activated muscle Signup and view all the answers

What is the reflex arc for the myotatic stretch reflex?

Simultaneous activation of alpha motor neurons and inhibitory interneurons Signup and view all the answers

What is the reflex arc for the inverse myotatic stretch reflex?

Afferent signals travel via type Ib sensory fibers to the spinal cord Signup and view all the answers

Which type of motor neurons innervate the extrafusal muscle fibers?

Alpha motor neurons Signup and view all the answers

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

To detect changes in muscle length Signup and view all the answers

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

The Ia fiber stops firing Signup and view all the answers

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

To inhibit the antagonist muscle Signup and view all the answers

What is the function of the Golgi tendon organ?

To detect changes in muscle tension Signup and view all the answers

What is the effect of the crossed extensor reflex?

It causes the opposite limb to extend Signup and view all the answers

What type of information do muscle spindles signal?

Changes in muscle length Signup and view all the answers

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

To inhibit the antagonist muscle Signup and view all the answers

What is the significance of the linkage between alpha and gamma motor neurons?

It enables the muscle spindle to signal length changes over the full range of muscle length Signup and view all the answers

What type of reflex is the SCI Stretch reflex (myotatic reflex)?

Monosynaptic Signup and view all the answers

Which structure signals the length of a muscle and changes in the length of a muscle?

Muscle spindle Signup and view all the answers

Where are motor neurons located in the spinal cord?

Ventral (anterior) gray horn Signup and view all the answers

What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?

To inhibit the antagonist muscle Signup and view all the answers

What is the role of gamma motor neurons in the muscle spindle?

To increase muscle spindle sensitivity Signup and view all the answers

Which type of reflex is the flexor reflex?

Polysynaptic reflex Signup and view all the answers

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

To excite the antagonist muscle Signup and view all the answers

What type of reflex is the SCI Stretch reflex (myotatic reflex)?

Monosynaptic reflex Signup and view all the answers

What happens when a reflex is initiated with a strong stimulus?

The reflex response is stronger Signup and view all the answers

What is the effect of the crossed extensor reflex?

To flex the contralateral limb Signup and view all the answers

What is the function of sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

To excite the muscle spindle Signup and view all the answers

Which of the following is true about the myotatic stretch reflex?

It is a monosynaptic reflex Signup and view all the answers

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

To relax the antagonist muscle Signup and view all the answers

What is the effect of the crossed extensor reflex?

It causes the opposite leg to flex Signup and view all the answers

What type of information do muscle spindles signal?

Muscle length and change of muscle length Signup and view all the answers

What is the purpose of the inverse myotatic stretch reflex?

To prevent exhaustive tension in the agonist muscle Signup and view all the answers

What happens during the flexor reflex?

The extensor muscle relaxes and the flexor muscle contracts Signup and view all the answers

What is the reflex arc for the myotatic stretch reflex?

Alteration of muscle length activates muscle spindles Signup and view all the answers

What is the role of gamma motor neurons in the muscle spindle?

To adjust the sensitivity of the muscle spindle Signup and view all the answers

What happens when a reflex is initiated with a strong stimulus?

More spinal cord segments are recruited Signup and view all the answers

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

The firing of the Ia sensory fiber increases Signup and view all the answers

Study Notes

Reflex Arc and Motor Neurons

Motor neurons are located in the ventral horn of the spinal cord.
Alpha motor neurons innervate extrafusal muscle fibers.
Gamma motor neurons innervate intrafusal muscle fibers of the muscle spindle.

Muscle Spindles

Muscle spindles signal the length of a muscle and changes in the length of a muscle.
Sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers signal the length of a muscle.
The role of gamma motor neurons in the muscle spindle is to modulate sensory information in a dynamic fashion.

Reflexes

The SCI Stretch reflex (myotatic reflex) is a type of reflex that responds to muscle stretch.
The purpose of the inverse myotatic stretch reflex is to reduce muscle tone.
The flexor reflex is a withdrawal reflex that occurs when a stimulus is applied to a limb.
The effect of the crossed extensor reflex is to contract the extensor muscles of the opposite limb.

Golgi Tendon Organ

The Golgi tendon organ signals the amount of force being applied to a muscle.
Ib afferent fibers innervate the Golgi tendon organ.
The role of Ib afferent fibers in the autogenic inhibition reflex is to reduce muscle force.

Inhibitory Interneurons

Inhibitory interneurons are involved in reciprocal innervation (inhibition), which allows for coordinated movement.
The function of inhibitory interneurons in reciprocal innervation (inhibition) is to reduce muscle tone.

Alpha and Gamma Motor Neurons

The significance of the linkage between alpha and gamma motor neurons is that they work together to control muscle tone and length.
When the alpha motor neuron alone is stimulated, the firing of the Ia sensory fiber increases.
When both the alpha and gamma motor neurons are stimulated, the firing of the Ia sensory fiber remains constant.

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Spinal Cord Somatic Reflexes and Motor Control Quiz

Questions and Answers

Which of the following is true about the reflex arc for spinal cord somatic reflexes?

Where are motor neurons located in the spinal cord?

What type of information do muscle spindles signal?

Which type of motor neurons innervate the extrafusal muscle fibers?

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

What is the significance of the linkage between alpha and gamma motor neurons?

What is the function of the Golgi tendon organ?

Which type of reflex is the SCI Stretch reflex (myotatic reflex)?

What is the purpose of the inverse myotatic stretch reflex?

What happens during the flexor reflex?

What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?

Which structure signals the amount of force being applied to a muscle?

What is the function of the muscle spindle?

Where are motor neurons located in the spinal cord?

What type of information do Golgi tendon organs signal?

Which of the following is true about the reflex arc for spinal cord somatic reflexes?

What is the function of sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

Which neurons innervate the extrafusal muscle fibers?

What is the purpose of the inverse myotatic stretch reflex?

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

What is the significance of the linkage between alpha and gamma motor neurons?

Which type of motor neurons innervate the intrafusal muscle fibers of the muscle spindle?

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

What is the role of gamma motor neurons in the muscle spindle?

Which type of gamma motor neurons modulate sensory information in a dynamic fashion?

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

What happens to the firing of the Ia sensory fiber when both the alpha and gamma motor neurons are stimulated?

What is the function of the Golgi tendon organ?

What type of fibers innervate the Golgi tendon organ?

What is the role of Ib afferent fibers in the autogenic inhibition reflex?

What is the significance of the stretch reflex?

Which of the following is true about the myotatic stretch reflex?

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

Which type of reflex is the flexor reflex?

What is the effect of the crossed extensor reflex?

What happens when a reflex is initiated with a strong stimulus?

What is the purpose of the Golgi tendon organ?

What is the reflex arc for the myotatic stretch reflex?

What is the reflex arc for the inverse myotatic stretch reflex?

Which type of motor neurons innervate the extrafusal muscle fibers?

What is the function of the sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

What is the function of the Golgi tendon organ?

What is the effect of the crossed extensor reflex?

What type of information do muscle spindles signal?

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

What is the significance of the linkage between alpha and gamma motor neurons?

What type of reflex is the SCI Stretch reflex (myotatic reflex)?

Which structure signals the length of a muscle and changes in the length of a muscle?

Where are motor neurons located in the spinal cord?

What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?

What is the role of gamma motor neurons in the muscle spindle?

Which type of reflex is the flexor reflex?

What is the purpose of reciprocal innervation in the myotatic stretch reflex?

What type of reflex is the SCI Stretch reflex (myotatic reflex)?

What happens when a reflex is initiated with a strong stimulus?

What is the effect of the crossed extensor reflex?

What is the function of sensory fibers (Ia) that terminate in the non-contractile region of the intrafusal fibers?

Which of the following is true about the myotatic stretch reflex?

What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?

What is the effect of the crossed extensor reflex?

What type of information do muscle spindles signal?

What is the purpose of the inverse myotatic stretch reflex?

What happens during the flexor reflex?

What is the reflex arc for the myotatic stretch reflex?

What is the role of gamma motor neurons in the muscle spindle?

What happens when a reflex is initiated with a strong stimulus?

What happens to the firing of the Ia sensory fiber when the alpha motor neuron alone is stimulated?

Study Notes

Reflex Arc and Motor Neurons

Muscle Spindles

Reflexes

Golgi Tendon Organ

Inhibitory Interneurons

Alpha and Gamma Motor Neurons

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