Cervical receptors and the direction of body sway.
A study was performed to determine whether the predominant direction of body sway is influenced by changes of head-to-trunk position. A group of ten patients suffering from acute unilateral vestibular loss was compared with a group of ten healthy subjects. Body sway was assessed by measurement on a posture platform. Center-of-force stabilograms were recorded with the subjects' eyes closed. After a baseline interval in the normal head-to trunk orientation, the head was torsioflexed with respect to the trunk and the locus of the center-of-force further assessed over a defined interval. It was observed that the patient group manifested a systematic translation of the direction of body sway that was associated in a consistent manner with the unilateral deficit. This translation occurred synchronously with head torsioflexion and could also be reproduced when turning the trunk with the head fixed, so that a semicircular canal influence could be excluded. It appears that cervical proprioceptive input to the central vestibular system is responsible for the effect observed.
Holtmann
S
S
Department of Otorhinolaryngology, University of Munich, Grosshardern Medical Center, Federal Republic of Germany.
Clarke
A
A
Scherer
H
H
D006257:Head; D006801:Humans; D009068:Movement; D009333:Neck / Q000294:innervation*; D011187:Posture; D011434:Proprioception; D014722:Vestibule, Labyrinth / Q000503:physiopathology