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Questions and Answers
What is a consequence of damaged descending cortical fibers?
What is a consequence of damaged descending cortical fibers?
- Absence of clonus
- Repetitive, sequential contraction of ankle flexors and extensors (correct)
- Isolation of motor neuron lesions
- Enhanced inhibition of antagonists
Which of the following is NOT a condition in which clonus may be seen?
Which of the following is NOT a condition in which clonus may be seen?
- Epilepsy
- Parkinson's disease (correct)
- Amyotrophic lateral sclerosis (ALS)
- Spinal cord damage
What is the characteristic posture of decerebrate posturing?
What is the characteristic posture of decerebrate posturing?
- Extended lower extremities with toes pointed inward and upper extremities extended with fingers flexed and forearms pronate (correct)
- Flexed neck and extended head
- Flexed upper limbs and extended lower limbs
- Extended upper limbs and flexed lower limbs
What is the primary location of damage causing decorticate posturing?
What is the primary location of damage causing decorticate posturing?
What is a key difference between decerebrate and decorticate posturing?
What is a key difference between decerebrate and decorticate posturing?
Which of the following is a feature of decorticate posturing?
Which of the following is a feature of decorticate posturing?
What is the relationship between clonus and upper motor neuron lesions?
What is the relationship between clonus and upper motor neuron lesions?
Which of the following conditions is LEAST likely to exhibit decerebrate posturing?
Which of the following conditions is LEAST likely to exhibit decerebrate posturing?
What is the primary function of the muscle spindle in a monosynaptic reflex?
What is the primary function of the muscle spindle in a monosynaptic reflex?
What is the characteristic feature of clonus?
What is the characteristic feature of clonus?
What is the neurotransmitter released at the central synapse in a monosynaptic reflex?
What is the neurotransmitter released at the central synapse in a monosynaptic reflex?
What is the term for a reflex arc with a single synapse between the afferent and efferent neurons?
What is the term for a reflex arc with a single synapse between the afferent and efferent neurons?
What is the response to the stretch of a skeletal muscle with an intact nerve supply?
What is the response to the stretch of a skeletal muscle with an intact nerve supply?
What is the typical example of a monosynaptic reflex?
What is the typical example of a monosynaptic reflex?
What is the characteristic feature of states with increased motor neuron activity?
What is the characteristic feature of states with increased motor neuron activity?
What is the minimum number of beats required to consider ankle clonus as abnormal?
What is the minimum number of beats required to consider ankle clonus as abnormal?
What is the primary mechanism that contributes to ankle clonus?
What is the primary mechanism that contributes to ankle clonus?
What type of injury can disrupt the descending cortical input to the Renshaw cell?
What type of injury can disrupt the descending cortical input to the Renshaw cell?
What is the function of the Renshaw cell in the neural circuitry?
What is the function of the Renshaw cell in the neural circuitry?
What is the role of cortical fibers in the neural circuitry?
What is the role of cortical fibers in the neural circuitry?
What is the result of synchronized motor neuron discharge in ankle clonus?
What is the result of synchronized motor neuron discharge in ankle clonus?
What is the consequence of spindle discharge in ankle clonus?
What is the consequence of spindle discharge in ankle clonus?
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