Inoue T, Kiribuchi T
Jpn J Ophthalmol. 1985;29(1):63-70.
Recordings of the unitary discharges from the ciliary nerves of rabbits indicated the presence of "ON" and "OFF" units, respectively exhibiting excitation or inhibition in response to ipsilateral diffuse light stimuli. The degree of both responses depended on the intensities of the light stimuli. The responses of both units were not evoked by electrical stimulation of the cervical sympathetic nerve, nor did they disappear when the sympathetic nerve was blocked. Thus, both units were thought to belong to the parasympathetic nerves originating from the oculomotor nerve. The spike discharges were recorded from both "ON" and "OFF" units of the ciliary nerves after electrical stimulation of the contralateral pretectal region. The latency of the responses ranged from 18 to 37 msec with a mean of 25 msec in the "ON" units, and 18 to 39 msec with a mean of 27 msec in the "OFF" units. The spike discharges were also evoked in both "ON" and "OFF" units by electrical stimulation of a defined area of the contralateral visual cortex; electrical stimulation of this area induced a pupil constriction in the contralateral eye, hence the area was called the cortical pupilloconstrictor area. The latency of the discharges was longer by 5 to 15 msec than the latency after the pretectal stimulation. It was thought that the impulses from the cortical pupilloconstrictor area are conducted via the pretectal region to the ciliary nerves, and that the pupillary light reflex and cortical pupillary response share a common pathway in the ciliary nerve.
对兔睫状神经的单位放电记录表明存在“开”单位和“关”单位，它们分别对同侧漫射光刺激表现出兴奋或抑制。两种反应的程度均取决于光刺激的强度。这两种单位的反应均不能由颈交感神经的电刺激诱发，且在交感神经被阻断时也不会消失。因此，这两种单位被认为属于源自动眼神经的副交感神经。在对侧顶盖前区进行电刺激后，从睫状神经的“开”单位和“关”单位均记录到了动作电位发放。“开”单位的反应潜伏期为18至37毫秒，平均为25毫秒；“关”单位的反应潜伏期为18至39毫秒，平均为27毫秒。对侧视皮质的特定区域进行电刺激也能在“开”单位和“关”单位诱发动作电位发放；对该区域的电刺激会引起对侧眼瞳孔收缩，因此该区域被称为皮质瞳孔收缩区。放电潜伏期比对侧顶盖前区刺激后的潜伏期长5至15毫秒。人们认为，来自皮质瞳孔收缩区的冲动经顶盖前区传导至睫状神经，并且瞳孔对光反射和皮质瞳孔反应在睫状神经中共享一条共同通路。
