Evolution of the Vestibulo-Ocular System
Corresponding Author
Bernd Fritzsch PhD
Professor in Anatomy
Department of Biomedical Sciences, Creighton University, Omaha, Nebraska
Reprint requests: Bernd Fritzsch, PhD, Professor in Anatomy, Creighton University, Department of Biomedical Sciences, Omaha, NE 68178.Search for more papers by this authorCorresponding Author
Bernd Fritzsch PhD
Professor in Anatomy
Department of Biomedical Sciences, Creighton University, Omaha, Nebraska
Reprint requests: Bernd Fritzsch, PhD, Professor in Anatomy, Creighton University, Department of Biomedical Sciences, Omaha, NE 68178.Search for more papers by this authorAbstract
The evolutionary and developmental changes in the eye muscle innervation, the inner ear, and the vestibulo-ocular reflex are examined. Three eye muscle patterns, based on the innervation by distinct ocular motoneurons populations, can be identified: a lamprey, an elasmobranch, and a bony fish/tetrapod pattern. Four distinct patterns of variation in the vestibular system are described: a hagfish pattern, a lamprey pattern, an elasmobranch pattern, and a bony fish/tetrapod pattern. Developmental data suggest an influence of the hindbrain on ear pattern formation, thus potentially allowing a concomitant change of eye muscle innervation and ear variation. The connections between the ear and the vestibular nuclei and between the vestibular nuclei and ocular motoneurons are reviewed, and the role of neurotrophins for pattern specification is discussed. Three patterns are recognized in central projections: a hagfish pattern, a lamprey pattern, and a pattern for jawed vertebrates. Second-order connections show both similarities and differences between distantly related species such as lampreys and mammals. For example, elasmobranchs lack an internuclear system, which is at best poorly developed in lampreys. It is suggested that the vestibulo-ocular system shows only a limited degree of variation because of the pronounced functional constraints imposed on it.
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