Reexamination of lobule I of the cerebellar anterior lobe vermis from a view point of the somatotopical organization

小脑前叶蚓部的第一小叶虽然被称为尾区，但已被证明接受迷路和颈部传入输入。这个项目是为了从体外源性组织的角度重新审视小叶I。1. 颈部、前庭和尾部传入输入在I小叶刺激后的空间分布。通过颈部和迷宫的苔藓纤维的汇聚输入是明显的。尾神经刺激反应最灵敏的区域是IIb小叶。2. 前庭脊髓神经元受I小叶抑制的特性如下：1)轴突向下胸椎段或更多的尾椎段发送。30个前庭-结肠神经元中只有2个被小叶I刺激抑制。2)它们接收来自颈部和迷路的收敛性兴奋输入，即前庭脊髓和颈部反射的共同中继神经元。3)部分药物可能作用于背部肌肉的运动神经元，因为I小叶的刺激抑制了背部肌肉的活动，而这种活动可以通过颈部和迷宫促进。(4)乳酸对第一小叶的损伤，使动物的姿态紊乱，与颈部或前庭神经分离引起的姿态紊乱相似，抑制了放置或跳跃反应。3. 据推测，在接受颈部和迷路受体的收敛输入时，小叶I可能会调节两种反射的共同中继神经元的总活动，以使最终输出对身体的稳定最优。

Although being referred to as the tail area, lobule I of the cerebellar anterior lobe vermis has been proved to receive the labyrinthine and neck afferent inputs. This project was made in order to reexamine lobule I from the view point of the somatotopical organization. 1. Spatial distribution of neck, vestibular and tail afferent inputs in lobule I were examined in lobule I after stimulation of these afferents. Convergent inputs through the mossy fibres from the neck and labyrinth were evident. The most responsive area to tail nerve stimulation was in lobule IIb. 2. Properties of vestibulospinal neurones receiving inhibitory influence from lobule I were as follows: 1) They send their axons to lower thoracic or more caudal segments. Only 2 of 30 vestibulocollic neurones were inhibited by lobule I stimulation. 2) They receive convergent excitatory inputs from the neck and labyrinth, that is, common relay neurones of vestibulospinal and neck reflexes. 3) Some of them may act on the motoneurones of the back muscle, because lobule I stimulation depressed the activity of back muscle which could be facilitated from the neck and labyrinth. 4) The lesion made in lobule I by kinic acid produced the disorder of the attitude in animals with similarity to that elicited by neck or vestibular deafferentation, and depressed the placing or hopping reactions. 3. It is supposed that, while receiving convergent inputs of neck and labyrinthine receptors, lobule I may adjust the total activity of the common relay neurones of the two reflexes as to make the resultant output optimal for the stabilization of the body.