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7 Cards in this Set
- Front
- Back
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What is a reflex?
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It is fast, involuntary, unplanned sequence of actions in response to a specific stimulus
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What is a cranial reflex?
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Is a reflex = integration of the information performed by the CNS in the brain stem e.g. Eye movement when reading.
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What is a spinal reflex?
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Is a reflex = integration of the information performed by the CNS occurs in the grey matter in the spinal cord e.g. Jerking head away from candle flame
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What is the difference between a somatic and an autonomic reflex?
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Somatic reflexes = contraction of the skeletal muscle
Autonomic = responses of the smooth cardiac muscle, cardiac muscle and glands = regulation of the → heart rate, digestion, urination. |
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What is a reflex arc?
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Arc reflex is a pathway followed by a nerve impulse that results in a reflex response
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What is a stretch reflex?
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Stretch reflex is contraction of skeletal muscle in response to the stretching of that muscle.
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What is the neural circuitry underlying the patella stretch reflex? How is the effector muscle controlled? How is the antagonist muscle controlled?
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A stretch of the tendon activates sensory receptors that monitor the length of muscles (i.e. muscle spindles).
Stimulation of the muscle spindle activates a sensory neuron that send information to the grey matter of the spinal cord. Integration occurs in the grey matter -the sensory neuron activates a motor neuron. Impulses travel down the motor neuron axon towards the effector(the muscle). Impulses from the motor neuron stimulate the muscle causing it to contract. Reciprocal innervation: A stretch of the tendon activates sensory receptors that monitor the length of muscles (i.e. muscle spindles). Stimulation of the muscle spindle activates a sensory neuron that sends information to the grey matter of the spinal cord. In the grey matter the sensory neuron activates (+) an inhibitory interneuron. The inhibitory interneuron synapses on and inhibits (-) the motor neuron innervating the hamstring muscles (antagonistic muscles). Due to the inhibition, the motor neuron innervating the |
