Response characteristics of muscle spindle endings  at constant length to variations in fusimotor activation.
D000818:Animals; D000842:Ankle; D002415:Cats; D004558:Electric Stimulation; D007366:Intercostal Muscles / Q000294:innervation; D008433:Mathematics; D009046:Motor Neurons / Q000502:physiology*; D009470:Muscle Spindles / Q000502:physiology*; D009132:Muscles; D009411:Nerve Endings / Q000502:physiology