In Figure 3.01, which neuron illustrated would elicit an IPSP in its target cell?
在图 3.01 中，哪个神经元会在其目标细胞中引发 IPSP？

Question

BlackTom AI · Accepted Answer

Question restatement: In Figure 3.01, which neuron illustrated would elicit an IPSP in its target cell?

Option A: the sensory neuron on the interneuron. This pairing would imply that the sensory neuron directly inhibits the interneuron. In the typical spinal reflex arc, the sensory (afferent) neuron synapses onto interneurons and motor neurons; however, IPSPs are typically generated onto the target motor neuron by interneurons, not by a sensory neuron directly inhibiting an interneuron. Therefore, this option is not consistent with the standard IPSP pathway depicted.

Option B: the sensory neuron on the motor neuron. If the sensory neuron were inhibiting the motor neuron, it would require a direct inhibitory synapse from the sensory neuron onto the motor neuron. In most spinal reflex drawings, sensory afferents provide excitation to motor neurons via interneurons and may contribute to inhibition via interneurons, but a direct IPSP from a sensory neuron onto a motor neuron is not the canonical mechanism shown. Thus, this option is unlikely to be correct.

Option C: the interneuron on the antagonistic motor neuron. Here, an interneuron would synapse onto the motor neuron that controls the antagonist muscle. If this interneuron is inhibitory, it would cause an IPSP in the antagonistic (target) motor neuron, reducing its activity and causing the antagonist muscle to relax. This directly aligns with the standard reflex mechanism where inhibition of the antagonist motor neuron via an interneuron leads to coordinated movement. Therefore, this option matches the IPSP scenario.

Option D: the antagonistic motor neuron on the antagonistic muscle. This option suggests the motor neuron of the antagonist muscle directly inhibiting its own muscle, which is biologically nonsensical since motor neurons typically excite their own muscle to cause contraction, not inhibit it via IPSP. IPSPs are typically observed at the postsynaptic membrane of neurons receiving inhibitory input, not as a direct action of a motor neuron on its own muscle fiber. Hence this option is incorrect.

Summary: The key idea is that an IPSP is produced when an inhibitory interneuron suppresses the activity of a target motor neuron, particularly the antagonistic motor neuron to allow the other muscle to act. Among the options, only Option C describes an interneuron providing inhibitory input to the antagonistic motor neuron, producing an IPSP in that target neuron. The other options either misplace the inhibitory synapse (sensory-to-interneuron or sensory-to-motor) or describe an action that would not generate an IPSP in the target neuron (the antagonistic motor neuron acting on its own muscle).

In Figure 3.01, which neuron illustrated would elicit an IPSP in its target cell? 在图 3.01 中，哪个神经元会在其目标细胞中引发 IPSP？单项选择题

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