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What does OPN stand for?

OPN stands for olivary pretectal nucleus


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Several nuclei have been identified within the pretectum, although their borders can be difficult to define and there has been debate over which regions should be included and their precise names. [1][10][11] The five primary nuclei are: the olivary pretectal nucleus (ON), the nucleus of the optic tract (NOT), and the anterior (NPA), medial (NPM), and posterior (NPP) pretectal nuclei. The NOT consists of relatively large cells and is located between the superior colliculi.
group of cells, constituting several subnuclei, located rostral to the superior colliculus in the “pretectal” area; these cells receive input from retinal ganglion cells (via the optic tract) and project bilaterally to the Edinger-Westphal nucleus; they serve as a relay center for the pupillary light reflex pathway. The group consists of the nucleus pretectalis anterior [TA] (anterior pretectal nucleus [TA]), nucleus pretectalis olivaris [TA] (olivary pretectal nucleus.