Burke D
Unit of Clinical Neurophysiology, Prince Henry Hospital, New South Wales, Australia.
Aust Paediatr J. 1988;24 Suppl 1:109-12.
Muscle is a complex sensory organ as well as a contractile apparatus, and disease processes that produce muscle weakness and wasting will affect the sensory information transmitted by receptors in muscle. In addition, one of the sensory structures in muscle, the muscle spindle, receives a motor innervation, the gamma-efferent or fusimotor system, with which the brain can alter the feedback that it receives from muscle. Muscle spindle activity forms the afferent limb of spinal reflexes, such as the tendon jerk, and long-loop reflexes that traverse supraspinal reflex pathways. Muscle spindle activity constitutes the major afferent cue for kinaesthetic sensations and contributes to updating the centrally generated programme for movement. This paper reviews briefly some aspects of muscle spindle activity and its fusimotor control as studied in human subjects using microneurography.
肌肉既是一个复杂的感觉器官，也是一个收缩装置，产生肌肉无力和萎缩的疾病过程会影响肌肉中感受器所传递的感觉信息。此外，肌肉中的一种感觉结构——肌梭，接受一种运动神经支配，即γ传出或梭内肌运动系统，大脑可借此改变从肌肉接收的反馈。肌梭活动形成脊髓反射（如腱反射）的传入支，以及穿越脊髓上反射通路的长环反射。肌梭活动构成动觉感觉的主要传入线索，并有助于更新中枢产生的运动程序。本文简要综述了使用微神经ography在人体受试者中研究的肌梭活动及其梭内肌运动控制的一些方面。
