Medulla Oblongata priority journal 8 Male 6 adult 6 controlled study 6 male 6 medulla oblongata 6 Adult 4 Animals 4 Brachyura 4 Humans 4 Magnetic Resonance Imaging 4 Neohelice granulata 4 Polysomnography 4 Silver Staining 4 Sleep Stages 4 Visual Pathways 4 anatomy and histology 4 animal 4 animal tissue 4 article 4 human 4 nerve cell 4 neuropil 4 nonhuman 4 physiology 4 silver staining 4 ultrastructure 4 visual system 4 wakefulness 4