Vestibular control of skeletal geometry in the guinea pig: a problem of good trim?

Abstract:

:Motor control of different segments of the body with multiple degrees of freedom appears to be coordinated by utilizing preferred axes of motor activity. This hypothesis may also be applied to vestibular control of posture. To explore this question we studied the anatomical relationship between the head and the cervical vertebral column by taking radiographs of the head-neck region in unrestrained alert guinea pigs. We determined that biomechanical constraints contribute to the stereotypical skeletal geometry observed in the resting animal and to a functional segmentation of the head-neck movement apparatus. Subsequent lesion studies of vestibular end organs with quantification of the resulting postural syndromes suggest that the functional segmentation of the cervical vertebral column corresponds to a functional partitioning of vestibular afferents. Our findings also indicate that the sensorimotor transformation mechanisms necessary to convert a given head velocity signal into the appropriate neck motor frame are already embedded in the networks provided by second-order vestibular neurons. Good trim of postural control will be the end result of an appropriate internal representation of the objective vertical.

journal_name

Prog Brain Res

authors

Vidal PP,Wang DH,Graf W,de Waele C

doi

10.1016/s0079-6123(08)62282-7

subject

Has Abstract

pub_date

1993-01-01 00:00:00

pages

229-43

eissn

0079-6123

issn

1875-7855

pii

S0079-6123(08)62282-7

journal_volume

97

pub_type

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