Samuelson U, Sjöstrand N O, Klinge E
Acta Physiol Scand. 1983 Dec;119(4):335-45. doi: 10.1111/j.1748-1716.1983.tb07349.x.
The electrical and mechanical activity of fine bundles of the bovine retractor penis muscle (rp) were investigated with the sucrose-gap technique. The main results were: the muscle displayed prominent automaticity. It showed a vigorous and long lasting active response to stretch. Phasic contractions of the rp were associated with electrical firing while tonic contractions were not necessarily correlated to spike activity. Stimulation of excitatory nerves induced excitatory junction potentials (EJP). Single EJPs could elicit spikes and repetitive firing with long lasting contraction. The EJPs were abolished by phentolamine and adrenergic neuron blocking agents. Physostigmine suppressed EJPs while scopolamine and atropine enhanced them and counteracted the effect of physostigmine. This points to an endogenous neurogenic prejunctional muscarinic suppression of the excitatory adrenergic neurotransmission. Inhibitory nerve stimulation could produce an inhibitory junction potential (IJP). However, the inhibitory nerves may also act on the contractile process without an IJP as a necessary step.
采用蔗糖间隙技术研究了牛阴茎退缩肌（rp）细束的电活动和机械活动。主要结果如下：该肌肉表现出显著的自律性。它对拉伸表现出强烈且持久的主动反应。rp的相性收缩与电发放相关，而紧张性收缩不一定与锋电位活动相关。刺激兴奋性神经可诱发兴奋性接头电位（EJP）。单个EJP可引发锋电位和重复放电，并伴有持久收缩。酚妥拉明和肾上腺素能神经元阻断剂可消除EJP。毒扁豆碱可抑制EJP，而东莨菪碱和阿托品可增强EJP，并抵消毒扁豆碱的作用。这表明存在内源性神经源性节前毒蕈碱对兴奋性肾上腺素能神经传递的抑制作用。刺激抑制性神经可产生抑制性接头电位（IJP）。然而，抑制性神经也可能在没有IJP作为必要步骤的情况下作用于收缩过程。
