fig 1.

A, Cross section through the mesencephalon at the level of the red nucleus shows the subdivision of the parvicellular subnucleus into the pars oralis and pars dorsomedialis (Heidenhain stain; original magnification × 8).

B, Cross section through the mesencephalon at the level of the red nucleus shows the subdivision of the parvicellular subnucleus into the pars oralis and pars dorsomedialis (original magnification × 30). The corresponding area of the adjacent myelin-stained section is delineated by the square in A.

C, Drawing of red nucleus partitions according to A shows the medullary lamella (ML) in the middle of the parvicellular subnucleus of the red nucleus.

Aq indicates sylvian aqueduct; Dm, pars dorsomedialis; Or, pars oralis; Mm, mammillary body; Su.n, substantia nigra. Parts A and B were reproduced with permission from S. Karger, Basel, Switzerland.