A cell mass extending forward over the dorsal surface of the crus cerebri from the rostral border of the pons into the subthalamic region.
A large cell mass extending forward over the dorsal surface of the crus cerebri from the rostral border of the pons into the subthalamic region. It is composed of a dorsal stratum of closely spaced melanin-containing pigmented cells, the pars compacta, and a larger ventral region of widely scattered cells, the pars reticulata.
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