The Localization of Large and Small Motoneurons in the Oculomotor Nucleus of the Monkey
With the development of new and more sensitive neuroanatomical tracer techniques it has become possible to reveal details which were not visible with older histological procedures. For example, the classical study of Warwick (1953) on the arrangement of motoneurons in the oculomotor nucleus (OMN) was based on the distribution of chromatolysis after cutting individual branches of the oculomotor nerve; in this way the motoneuron pool for the medial rectus muscle was shown to lie ipsilaterally in the ventral portion of the nucleus. In contrast, subsequent experiments using retrograde tracer substances, horseradish peroxidase (HRP) and wheatgerm agglutinin (WGA), revealed a multifocal representation for medial rectus, including a group of small motoneurons lying outside the classical OMN (Büttner-Ennever, Akert 1981: Spencer, Porter 1981).
KeywordsSuperior Colliculus Extraocular Muscle Oculomotor Nerve Medial Rectus Motoneuron Pool
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- Büttner-Ennever JA (1981) Anatomy of medial rectus subgroups in the oculomotor nucleus of the monkey. In Fuchs AF and Becker W, eds. The neural control of eye movements, pp 247–252. Elsevier/North Holland Amsterdam.Google Scholar