Multi-source inputs converge on the superior salivatory nucleus neurons in anaesthetized rats

作者：Ishizuka Ken'Ichi^*; Oskutyte Diana; Satoh Yoshihide; Murakami Toshiki

来源：Autonomic Neuroscience-Basic & Clinical, 2010, 156(1-2): 104-110.

DOI：10.1016/j.autneu.2010.03.014

• Preganglionic superior salivatory nucleus neurons
• Excitatory amino acids
• Pulse-related activity
• Tracheal pressure-related activity
• Lingual nerve modulation

Activation of parasympathetic nerves innervating salivary glands evokes not only salivation but also vascular responses. These parasympathetic nerves may have cardiac and/or respiratory-related activity as well as the cardiovascular sympathetic nerves that control vascular bed of salivary glands. Therefore, we investigated whether preganglionic superior salivatory nucleus (SSN) neurons projecting to the submandibular and intra-lingual ganglia exhibit pulse-related and/or respiratory-related activity, and whether they can be excited by electrical stimulation of the lingual nerve.
25% of SSN neurons were found to have pulse-related and tracheal pressure-related activities, implying that they receive cardiac and respiratory inputs. 44% of neurons exhibited only pulse-related activity, whereas 31% of the neurons had neither pulse-related nor tracheal pressure-related activity. Neurons with pulse and tracheal pressure-related activities, and those only with pulse-related activity, had B and C fibre range axons. 53% of SSN neurons received both cardiac and lingual nerve inputs. 16% of neurons recorded were found to receive only cardiac inputs, and 26% only lingual nerve inputs: whereas 5% received neither cardiac nor lingual nerve inputs.
We conclude that the inputs from diverse sources converge on the SSN neurons, and they can cooperate to modulate SSN neuronal activity.

• 出版日期2010-8-25