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The Head-Neck Sensory Motor System$
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Alain Berthoz, Werner Graf, and P. P. Vidal

Print publication date: 1992

Print ISBN-13: 9780195068207

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195068207.001.0001

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Role of the Tectoreticulospinal System in the Coordination of Eye-Head Orienting Movements

Role of the Tectoreticulospinal System in the Coordination of Eye-Head Orienting Movements

Chapter:
(p.296) Chapter 47 Role of the Tectoreticulospinal System in the Coordination of Eye-Head Orienting Movements
Source:
The Head-Neck Sensory Motor System
Author(s):

Douglas P. Munoz

Daniel Guitton

Denis Pélisson

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195068207.003.0047

Orienting movements, which direct the visual axis to a new target of interest, often involve combined eye and head displacements. As a consequence of the mechanical limits in ocular motility, a target located beyond these limits (oculomotor range) can only be fixated by means of coordinated eye-head motion that generates a single-step saccade-like gaze shift. This dependence on eye-head coupling is especially prevalent in the cat. The eye and head segments of an orienting gaze shift are tightly connected in the cat, suggesting the presence of a strong common drive to both eye and head premotor circuits. Among possible candidates, the superior colliculus has been identified as a significant brain stem center involved in the control of the orientation.

Keywords:   orienting movements, visual axis, premotor circuits, superior colliculus, eye, head

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