in total , the substantia nigra appears to have a layered organization : the superior layer is the cellular pars compacta , the second is the dorso-medial area of pars reticulata where both pars compacta and pars reticulata dendrites run rostro-caudally and dorso-ventrally and the third layer is the peripeduncular region where dendrites from all areas run parallel to the crus cerebri .
C0038590
substantia nigra
C0175412
pars compacta