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The excitatory innervation of bovine tracheal smooth muscle has been studied with the sucrose-gap apparatus.2. Single 2 ms electrical stimuli applied to the whole tissue excited intrinsic nerves, and produced a small transient depolarization of the smooth muscle, the excitatory junction potential (e.j.p.). The e.j.p. caused a twitch-type contraction; twitches and e.j.p.s summated during repetitive stimulation but facilitation was not observed, and action potentials were never elicited.3. The effects of electrical stimulation could be abolished by atropine (5 x 10(-7) mol/l) and augmented by neostigmine (4 x 10(-6) mol/l), and were mimicked by exogenous acetylcholine (1.0 mug/ml).4. With the electron microscope, the density of innervation was found to be low (one axon per ninety smooth muscle cells). Axons were found in small groups in the clefts between bundles of cells, but no axons penetrated within the muscle bundles. Naked axon varicosities containing agranular vesicles were seen, but no axon approached within 200 nm of a smooth muscle cell.5. It is difficult to reconcile the sparsity of innervation with the dependence of the tissue on nerve excitation to initiate activity.

已使用蔗糖间隙装置研究了牛气管平滑肌的兴奋性神经支配。
对整个组织施加单次2毫秒的电刺激会激发内在神经，并使平滑肌产生一个小的短暂去极化，即兴奋性接头电位（e.j.p.）。e.j.p. 引起抽搐样收缩；在重复刺激期间抽搐和e.j.p. 会叠加，但未观察到易化现象，且从未引发动作电位。
电刺激的作用可被阿托品（5×10⁻⁷摩尔/升）消除，并被新斯的明（4×10⁻⁶摩尔/升）增强，且外源性乙酰胆碱（1.0微克/毫升）可模拟其作用。
用电子显微镜观察发现，神经支配密度较低（每90个平滑肌细胞有一个轴突）。轴突成小群地位于细胞束之间的裂隙中，但没有轴突穿透肌束。可见含有无颗粒小泡的裸露轴突膨体，但没有轴突接近平滑肌细胞200纳米以内。
很难将神经支配的稀疏性与该组织对神经兴奋以启动活动的依赖性协调起来。

The excitatory innervation of bovine tracheal smooth muscle has been studied with the sucrose-gap apparatus.2. Single 2 ms electrical stimuli applied to the whole tissue excited intrinsic nerves, and produced a small transient depolarization of the smooth muscle, the excitatory junction potential (e.j.p.). The e.j.p. caused a twitch-type contraction; twitches and e.j.p.s summated during repetitive stimulation but facilitation was not observed, and action potentials were never elicited.3. The effects of electrical stimulation could be abolished by atropine (5 x 10(-7) mol/l) and augmented by neostigmine (4 x 10(-6) mol/l), and were mimicked by exogenous acetylcholine (1.0 mug/ml).4. With the electron microscope, the density of innervation was found to be low (one axon per ninety smooth muscle cells). Axons were found in small groups in the clefts between bundles of cells, but no axons penetrated within the muscle bundles. Naked axon varicosities containing agranular vesicles were seen, but no axon approached within 200 nm of a smooth muscle cell.5. It is difficult to reconcile the sparsity of innervation with the dependence of the tissue on nerve excitation to initiate activity.

已使用蔗糖间隙装置研究了牛气管平滑肌的兴奋性神经支配。
对整个组织施加单次2毫秒的电刺激会激发内在神经，并使平滑肌产生一个小的短暂去极化，即兴奋性接头电位（e.j.p.）。e.j.p. 引起抽搐样收缩；在重复刺激期间抽搐和e.j.p. 会叠加，但未观察到易化现象，且从未引发动作电位。
电刺激的作用可被阿托品（5×10⁻⁷摩尔/升）消除，并被新斯的明（4×10⁻⁶摩尔/升）增强，且外源性乙酰胆碱（1.0微克/毫升）可模拟其作用。
用电子显微镜观察发现，神经支配密度较低（每90个平滑肌细胞有一个轴突）。轴突成小群地位于细胞束之间的裂隙中，但没有轴突穿透肌束。可见含有无颗粒小泡的裸露轴突膨体，但没有轴突接近平滑肌细胞200纳米以内。
很难将神经支配的稀疏性与该组织对神经兴奋以启动活动的依赖性协调起来。

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