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Questions and Answers
Which of the following is true about the reflex arc for spinal cord somatic reflexes?
Which of the following is true about the reflex arc for spinal cord somatic reflexes?
- Receptor activation occurs before sensory info transmission.
- Motor neuron activation occurs before receptor activation.
- Processing of information occurs before sensory info transmission. (correct)
- Motor neuron activation occurs before processing of information.
Where are motor neurons located in the spinal cord?
Where are motor neurons located in the spinal cord?
- Ventral (anterior) gray horn (correct)
- White matter
- Lateral gray horn
- Dorsal (posterior) gray horn
What type of information do muscle spindles signal?
What type of information do muscle spindles signal?
- Muscle fatigue
- Muscle length & rate of change (correct)
- Muscle force
- Muscle tension
Which type of motor neurons innervate the extrafusal muscle fibers?
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 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 significance of the linkage between alpha and gamma motor neurons?
What is the function of the Golgi tendon organ?
What is the function of the Golgi tendon organ?
Which type of reflex is the SCI Stretch reflex (myotatic reflex)?
Which type of reflex is the SCI Stretch reflex (myotatic reflex)?
What is the purpose of the inverse myotatic stretch reflex?
What is the purpose of the inverse myotatic stretch reflex?
What happens during the flexor reflex?
What happens during the flexor reflex?
What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?
What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?
Which structure signals the amount of force being applied to a muscle?
Which structure signals the amount of force being applied to a muscle?
What is the function of the muscle spindle?
What is the function of the muscle spindle?
Where are motor neurons located in the spinal cord?
Where are motor neurons located in the spinal cord?
What type of information do Golgi tendon organs signal?
What type of information do Golgi tendon organs signal?
Which of the following is true about the reflex arc for spinal cord somatic reflexes?
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?
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?
Which neurons innervate the extrafusal muscle fibers?
What is the purpose of the inverse myotatic stretch reflex?
What is the purpose of the inverse myotatic stretch reflex?
What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?
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 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?
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 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?
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?
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 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 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 is the function of the Golgi tendon organ?
What type of fibers innervate 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 role of Ib afferent fibers in the autogenic inhibition reflex?
What is the significance of the stretch reflex?
What is the significance of the stretch reflex?
Which of the following is true about the myotatic 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?
What is the purpose of reciprocal innervation in the myotatic stretch reflex?
Which type of reflex is the flexor reflex?
Which type of reflex is the flexor reflex?
What is the effect of the crossed extensor reflex?
What is the effect of the crossed extensor reflex?
What happens when a reflex is initiated with a strong stimulus?
What happens when a reflex is initiated with a strong stimulus?
What is the purpose of the Golgi tendon organ?
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 myotatic stretch reflex?
What is the reflex arc for the inverse myotatic stretch reflex?
What is the reflex arc for the inverse myotatic stretch reflex?
Which type of motor neurons innervate the extrafusal muscle fibers?
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 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 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 purpose of reciprocal innervation in the myotatic stretch reflex?
What is the function of the Golgi tendon organ?
What is the function of the Golgi tendon organ?
What is the effect of the crossed extensor reflex?
What is the effect of the crossed extensor reflex?
What type of information do muscle spindles signal?
What type of information do muscle spindles signal?
What is the function of inhibitory interneurons in reciprocal innervation (inhibition)?
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 is the significance of the linkage between alpha and gamma motor neurons?
What type of reflex is the SCI Stretch reflex (myotatic reflex)?
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?
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?
Where are motor neurons located in the spinal cord?
What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?
What is the function of inhibitory interneurons in the reciprocal innervation (inhibition)?
What is the role of gamma motor neurons in the muscle spindle?
What is the role of gamma motor neurons in the muscle spindle?
Which type of reflex is the flexor reflex?
Which type of reflex is the flexor reflex?
What is the purpose of reciprocal innervation in the myotatic stretch 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 type of reflex is the SCI Stretch reflex (myotatic reflex)?
What happens when a reflex is initiated with a strong stimulus?
What happens when a reflex is initiated with a strong stimulus?
What is the effect of the crossed extensor reflex?
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?
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?
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 function of inhibitory interneurons in reciprocal innervation (inhibition)?
What is the effect of the crossed extensor reflex?
What is the effect of the crossed extensor reflex?
What type of information do muscle spindles signal?
What type of information do muscle spindles signal?
What is the purpose of the inverse myotatic stretch reflex?
What is the purpose of the inverse myotatic stretch reflex?
What happens during the flexor reflex?
What happens during the flexor reflex?
What is the reflex arc for the myotatic stretch reflex?
What is the reflex arc for the myotatic stretch reflex?
What is the role of gamma motor neurons in the muscle spindle?
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 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?
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
- 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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Description
Test your knowledge on spinal cord somatic reflexes and motor control with this quiz. Learn about the reflex arc, sensory information transmission, motor neuron activation, and more. Explore the basic neuronal circuit for motor control and muscle receptors.
