Test Your Knowledge On Knee Reflex Test
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In the knee-jerk reflex, tapping the tendon is ____________.
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Stimulus
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Interneuron
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Effector
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None of the above
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- 2.
Which segment of the spinal cord does the knee jerk reflex test?
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L2
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L3
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L4
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All of the above
Correct Answer
A. All of the aboveExplanation
The knee jerk reflex test involves tapping the patellar tendon just below the kneecap, which causes the quadriceps muscle to contract and extend the leg. This reflex is mediated by the monosynaptic pathway involving the sensory neurons in the muscle spindle and motor neurons in the spinal cord. The sensory information from the patellar tendon travels through the femoral nerve, which arises from the lumbar plexus formed by the spinal nerves L2, L3, and L4. Therefore, all of these segments of the spinal cord are involved in the knee jerk reflex.Rate this question:
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- 3.
What is the other name for the knee-jerk reflex?
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Spinal reflex
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Cerebellar reflex
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Patellar reflex
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None of the above
Correct Answer
A. Patellar reflexExplanation
The knee-jerk reflex is also known as the patellar reflex. This reflex occurs when the patellar tendon, located just below the kneecap, is tapped, causing the quadriceps muscle to contract and the lower leg to kick forward. This reflex is mediated by the spinal cord and does not involve the cerebellum. Therefore, the correct answer is Patellar reflex.Rate this question:
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- 4.
When did Sir Michael Foster record knee-jerk reflex in his physiology textbook?
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1877
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1880
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1881
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1882
Correct Answer
A. 1877Explanation
In his physiology textbook, Sir Michael Foster recorded the knee-jerk reflex in 1877.Rate this question:
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- 5.
Who first reported the knee-jerk reaction?
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Wilhelm Heinrich Erb
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Carl Friedrich Westphal
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O. O. McIntyre
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Both (a) and (b)
Correct Answer
A. Both (a) and (b)Explanation
Both Wilhelm Heinrich Erb and Carl Friedrich Westphal are credited with reporting the knee-jerk reaction. Therefore, the correct answer is "Both (a) and (b)".Rate this question:
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- 6.
The knee-jerk reflex is an example of ______________.
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Monosynaptic reflex arc
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Pharyngeal reflex
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Skeletal reflex arc
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None of the above
Correct Answer
A. Monosynaptic reflex arcExplanation
The knee-jerk reflex is an example of a monosynaptic reflex arc. In this reflex, the sensory neuron directly synapses with the motor neuron in the spinal cord, without involving any interneurons. When the patellar tendon is tapped, the stretch receptors in the muscle send signals to the spinal cord, which immediately triggers a motor response to contract the quadriceps muscle and extend the leg. This direct connection between the sensory and motor neurons allows for a quick and automatic response to a stimulus, making it an example of a monosynaptic reflex arc.Rate this question:
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- 7.
When was the knee jerk reflex first reported?
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About 1875
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About 1880
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About 1889
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About 1893
Correct Answer
A. About 1875Explanation
The knee jerk reflex was first reported around 1875.Rate this question:
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- 8.
Which motor neuron is responsible for the contraction of the legs during the knee reflex test?
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Marginal Cell Neuron
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Sublateral Motor Neuron
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Motor Neuron 5
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Alpha motor neuron
Correct Answer
A. Alpha motor neuronExplanation
The alpha motor neuron is responsible for the contraction of the legs during the knee reflex test. This type of motor neuron is located in the spinal cord and is responsible for activating skeletal muscles. When the knee is tapped, the sensory information is transmitted to the spinal cord, which then activates the alpha motor neuron to stimulate the contraction of the leg muscles, causing the reflexive movement of the leg.Rate this question:
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- 9.
Multiple leg oscillations during the knee-jerk reflex can be a sign of _______________.
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Cerebellar diseases
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Muscle diseases
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Dementia
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None of the above
Correct Answer
A. Cerebellar diseasesExplanation
Multiple leg oscillations during the knee-jerk reflex can be a sign of cerebellar diseases. The knee-jerk reflex is controlled by the spinal cord and the cerebellum, which is responsible for coordinating movement and maintaining balance. When there are abnormalities or damage to the cerebellum, it can disrupt the normal reflex response and result in multiple leg oscillations. This is why cerebellar diseases, such as ataxia or cerebellar degeneration, can manifest as abnormal knee-jerk reflexes. Muscle diseases or dementia do not specifically affect the cerebellum and are not associated with this particular reflex abnormality.Rate this question:
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- 10.
The absence or decrease of knee-jerk reflex is known as ____________.
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Westphal's sign
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Patellar sign
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Cerebellar sign
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None of the above
Correct Answer
A. Westphal's signExplanation
The absence or decrease of knee-jerk reflex is known as Westphal's sign.Rate this question:
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Current Version
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Feb 23, 2023Quiz Edited by
ProProfs Editorial Team -
Feb 13, 2023Quiz Created by
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