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Twitch and Non‐Twitch Motoneurons of Extraocular Muscles Have Different Histochemical Properties

The extraocular muscles of vertebrates show a highly complicated organization. Their muscle fibers can be classified into two main categories: singly innervated ''twitch'' fibers (TMF), resembling those of skeletal muscle, and multiply innervated "non-twitch" fibers (non-TMF). The motoneurons ofextraocular muscles lie in three brainstem nuclei: the oculomotor nucleus, the trochlear nucleus, and the abducens nucleus. Recent work in the macaque monkey showed that the motoneurons innervating non-TMFs are located in separate subgroups, which lie around the borders of the classic nuclei.! In the current study, we investigated whether TMF and non-TMF motoneurons differ in their histochemical properties, using combined tract-tracing and immunofluorescence methods.