Reflexes and the CNS

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Okay, so I read in the TPR Bio book that the CNS is responsible for processing information and that sensory neurons transmit info the CNS.

However, right after that, they describe a reflex in which a sensory neuron synapses directly with a motor neuron in the dorsal root ganglion, which proceeds to innervate an effector. So is this the exception to the rule?

 

[EmergentCough]

This is an example of the knee jerk reflex, but the gangion are the cell bodies of the afferent sensory neurons and just along the way to the CNS. This is just more sensory neuron activation. The actual synapse between the sensory neuron and motor neuron is within the dorsal, which is part of the CNS. So no, not an exception.

 

[image187]

This is an example of the knee jerk reflex, but the gangion are the cell bodies of the afferent sensory neurons and just along the way to the CNS. This is just more sensory neuron activation. The actual synapse between the sensory neuron and motor neuron is within the dorsal, which is part of the CNS. So no, not an exception.

The cell body of this motor neuron is actually located within the anterior horn, a different area of gray matter within the spinal cord. The dorsal root ganglion consists solely of cell bodies of sensory neurons.

 

[adrakdavra]

Nsystem works via different pathway , at the end all roads lead to Rome , all singles lead to the brain. However , the reflex system is designed in a such a way that it is fast and smooth , hence a boxer with a faster reflex wins. Also pain and reflex , anyway , sensory affectors dorsal connect to the spinal cord first then to the ventral motor effectors , what you are missing in ur formula is the internourons it the spinal cord also the spinal cord is a two way street so you can drive to the Brian while others drive to the toe, when u step on a sharp object you don't have time to think so the spinal cord internoruns. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord, although the brain will receive sensory input while the reflex action occurs. What is so fascinated about internourons they can be excitatory or inhibitory, because you don't want to be jumping like a monky all day, a good MCAT Q on this R4 Bio