Case studies Reflexes Shanthi, a 47-year-old female, was having a neurological e
ID: 3522004 • Letter: C
Question
Case studies Reflexes Shanthi, a 47-year-old female, was having a neurological examination. The doctor tested the monosynaptic stretch refle arc in the muscles of her thigh. The reflex arc tested was a spinal reflex. 1. How would the doctor stimulate the stretch reflex in the muscles of Shanthi's anterior thigh? 2. What is a reflex? 3. What is a reflex arc? 4. What is a monosynaptic reflex arc? 5. Name, in order, the five main components of a reflex arc. Briefly explain what each 6. What are the sensory receptors of the stretch reflex arc of Shanthi's thigh muscles? 7. How does stretching the sensory receptors of the stretch reflex arc result in contraction of the same muscle? 8. Which of Shanthi's anterior thigh muscles will contract in response to being stretched? 9. What will happen to the antagonist thigh muscles during the tion of the anterior thigh muscle s tretch reflex? 10. How is the effect on the antagonist muscle group that you describe in question 9 brought about?Explanation / Answer
1. In this case, the when the doctor stimulates the anterior of the thigh, the muscle spindles (adductors) are quickly stretched and they send a message to alpha motor neurons in the spinal cord. The alpha motor neurons are responsible for the contraction of the inner thigh muscles (adductors) to get stretched, and the patient will narrowly avoid the stimulation.
2. Reflex/ reflex action, In response to any stimulation when there is the involuntary and instantaneous movement, takes place within the body is called reflex. A reflex can only be possible by the particular neural pathways which are called reflex arcs. This reflex arc acts on an impulse before that impulse approaches the brain. The reflex is now we can say an automatic response to a stimulus that does not receive or need conscious thought.
3. A reflex arc can be defined as the is a neural pathway which controls a reflex. In most of the sensory neurons do not pass directly towards the brain, but synapse in the spinal cord. The reflex arc allows faster reflex actions to take place this made possible by activating spinal motor neurons without any delay of routing signals through the brain.
4. The presence of only two neurons, one sensory neuron, and other is a motor neuron in the reflex arc, it is defined as monosynaptic. Monosynaptic we can say a single chemical synapse.