Abstract：
How does repeated stimulation of mechanoafferents affect feeding motor neurons? Monosynaptic connections from a mechanoafferent population in the Aplysia buccal ganglia to five motor followers with different functions were examined during repeated stimulus trains. The mechanoafferents produced both fast and slow synaptic outputs, which could be excitatory or inhibitory. In contrast, other Aplysia mechanoafferents produce only fast excitation on their followers. In addition, patterns of synaptic connections were different to the different motor followers. Some followers received both fast excitation and fast inhibition, whereas others received exclusively fast excitation. All followers showed strong decreases in fast postsynaptic potential (PSP) amplitude within a stimulus train. Fast and slow synaptic connections were of net opposite signs in some followers but not in others. For one follower, synaptic contacts were not uniform from all subareas of the mechanoafferent cluster. Differences in properties of the buccal ganglia mechanoafferents and other Aplysia mechanoafferents may arise because the buccal ganglia neurons innervate the interior of the feeding apparatus, rather than an external surface, and connect to motor neurons for muscles with different motor functions. Fast connection patterns suggest that these synapses may be activated when food slips, biasing the musculature to release food. The largest slow inhibitory synaptic PSPs may contribute to a delay in the onset of the next behavior. Additional functions are also possible.
摘要：
机械传入神经的重复刺激如何影响摄食运动神经元？在重复刺激训练中，检查了从腹肌颊神经节中的机械传入神经群到五个具有不同功能的运动跟随者的单突触连接。机械传入产生了快速和慢速的突触输出，可能是兴奋性或抑制性的。相比之下,其他Aplysia机械影响仅对其追随者产生快速激励。此外,不同运动跟随者的突触连接模式不同。一些追随者既受到快速激励又受到快速抑制，而其他人只接受快速激励。所有追随者在刺激序列中显示出快速突触后电位（PSP）振幅的强烈降低。在某些追随者中，快速和慢速的突触连接具有相反的符号，而在其他追随者中却没有。对于一个追随者，机械传入簇的所有子区域的突触接触不均匀。由于颊神经节神经元神经支配饲喂装置的内部，因此可能会出现颊神经节机械传入和其他腹肌机械传入的性质差异，而不是外表面，并连接到具有不同运动功能的肌肉的运动神经元。快速连接模式表明，这些突触可能会在食物流失时被激活，偏置肌肉组织释放食物。最大的慢抑制性突触PSP可能会导致下一个行为开始的延迟。附加功能也是可能的。
