This study confirms that palisade endings originate in the EOM motor nuclei and further indicates that they are extensions of the axons supplying the muscle fiber related to the palisade. The present work excludes the possibility that they receive cholinergic trigeminal projections. These findings call into doubt the proposed proprioceptive function of palisade endings.
Research highlights▶ Neuronal tracer was injected into the abducens nucleus of monkey. ▶ Tracer positive axons were observed in the lateral rectus muscles. ▶ Tracer positive axons were cholinergic and established motor terminals. ▶ Palisade endings in the lateral rectus contained tracer as well. ▶ This study shows that palisade endings originate from motor nuclei.
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