Accession Number : AD0782593

Title :   Eighth Nerve Contributions to the Synthesis of Locomotor Control,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) DRB AVIATION MEDICAL RESEARCH UNIT

Personal Author(s) : Jones,G. Melvill ; Watt,D. G. D. ; Rossignol,S.

Report Date : 1974

Pagination or Media Count : 20

Abstract : Recent experiments have demonstrated a short latency EMG response (75 msec) in human gastrocnemius on sudden unexpected initiation of a free fall. Cats were found to exhibit a similar short latency response which is permanently abolished by bilateral labyrinthectormy, but not by surgical inactivation of the semicircular canals. These findings point to a functionally effective vestibulo-spinal response to specifically vertical linear accelerative stimulation of the vestibular otolith end organs. Since large cyclical changes in vertical linear acceleration of the head occur during normal human locomotion, especially running, it seems likely that this specific vestibulo-spinal influence could play an important role in the synthesis of normal locomotor control. This question has been examined in human subjects using hopping on one leg as a simplified monopedal model of cyclical locomotor activity.

Descriptors :   *Motor reactions, *Electromyography, *Neuromuscular transmission, Muscles, Physiology, Control, Vestibular apparatus, Canada

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE