Parvicellular red nucleus and its descending tract.

<p>A: Photograph showing points of insertion of DiI crystal into the dorsomedial and ventrolateral parts of the rostral human red nucleus at the level of the fasciculus retroflexus. B–D: Fluorescence photomicrographs showing the distribution of DiI-labeled cell processes consisting of axons, dendrites and glial processes. B: Labeled dorsomedial part (i.e., the NB) of the red nucleus and labeled fiber bundle arising from the NB near the DiI-inserted point. C: Labeled ventrolateral part of the red nucleus near the DiI-inserted point. D: Labeled CTT located over the NB. Asterisk (*) shows labelled fiber bundle of the superior cerebellar peduncle. CTT – central tegmental tract, FR – fasciculus retroflexus, l – lateral, m – medial, NB – nucleus accessorius medialis of Bechterew, SNc – substantia nigra pars compacta, vlpNr – ventorlateral part of parvicellular red nucleus. Scale bar = 1 cm in A, 100 µm in B–D.