Do inhibitory motor neurons exist?

[anavistas]

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Can somebody clarify this for me plz:

TPR: Reflexes: .....The sensory neuron synapses with not only a motor neuron , but also with an inhibitory interneuron.....When the sensory nerve is stimulated by stretch, it simulates both the quadriceps motor neuron and the "inhibitory" interneuron....so the hamstring relaxes.

....all somatic motor neurons are excitatory.....

 

[PiBond]

Can somebody clarify this for me plz:

TPR: Reflexes: .....The sensory neuron synapses with not only a motor neuron , but also with an inhibitory interneuron.....When the sensory nerve is stimulated by stretch, it simulates both the quadriceps motor neuron and the "inhibitory" interneuron....so the hamstring relaxes.

....all somatic motor neurons are excitatory.....

yes, all somatic motor neurons are excitatory at the neuromuscular junction (they release acetylcholine which causes depolarization and subsequent muscle contraction).

what TPR is saying: when the sensory neuron is triggered, it's going to not only "talk" to the somatic motor neuron that causes the quad to contract, but it's also going to "talk" to an interneuron that will ensure that our hamstring won't contract so that there won't be opposing forces at work. if we had both contract at the same time, then there could be a possible muscle tear, or something like that. in effect, we aren't releasing an inhibitory neurontransmitter on the hamstring...we're just making sure that the motor neuron leading to the hamstring won't contract by utilizing an interneuron (which is inhibitory) that will communicate to the hamstring motor neuron to not fire.

does that make sense?

 

[echolalia16]

The muscle fiber that responds to the neurotransmitter that is released (or not) can only be excitatory, at least in humans. A neuron can inhibit muscle contraction, then, via an interneuron that inhibits the motorneuron instead of the muscle itself.

 

[anavistas]

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