Sentence:  The substantia innominata of the BF is reported to project to the SWS-promoting parvicellular area of the reticular nucleus (also called the <WSD>parafacial</WSD> zone) [38 , 39 ]. 
Meaning of the word marked with <WSD> tags:  Relating to the area between the ptilinal fissure and the compound eye of insects.