Spinal Reflex is served by the A spinal refiex actionaly requires three neurons.

Question

Spinal Reflex is served by the A spinal refiex actionaly requires three neurons. Uxing Sgure 15.5 as a refereace, what funct 1. semsory neuron? 2. interneuron? 3. motor neuron? These three newrons form the so-called spinal reflex are. Spinal Reflex in Frog (Optional) 0% acetic acid to the left leg and note the response. Explain why Mold a frog so that its legs hang down loosely. Apply both legs respond to the stimulus. If the sciatic nerve is severed on the left side, will the frog still be able to respond to this stimulus? (The sciatic nerve serves the muscles of the leg.) If just the dorsal root ganglion is severed, will the frog still be able to respond to the stimulus? If the ventral root only is severed, what will happen to the left leg if 10% acetic acid is applied to the leg on that side? What will happen to the right leg? If the brain is destroyed, will the frog still be able to respond to the stimulus? Also answer these questions In what manner is it possible for the intact brain to become aware of a stimulus? 15-8

Explanation / Answer

First of all, a reflex is a involuntary response that occur automatically without any conscious effort.

Spinal reflex are the reflexes which are integrated within the spinal cord, they does not require input from the brain.  

Neurons are the fundamental unit of the nervous system.

SENSORY NEURON: Sensory neuron(afferent) are activated by the sensory input from the environment. Sensory neurons carry signals from outer body parts to the central nervous system. For example: when you touch a hot surface the signals are transmitted by sensory organs to the central nervous system.

INTERNEURON: Interneurons(associative) neurons are the decision making neurons. It is present in the grey region of the spinal cord. Sensory neurons pass the signals/information to the interneurons and hence they decide to respond to a stimuli. Interneurons are the link between sensory,motor neurons and the central nervous system.

MOTOR NEURONS: Motor neurons(efferent) regulates body's movement mechanism. They help in transmission of impulses from brain and spinal cord to the muscles.

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