part of medial geniculate nucleus medial nucleus of medial geniculate body BTO:0002672 BrendaTissueOBO The medial of the medial geniculate nuclei; it receives afferent projections from both auditory and nonauditory neurons of the brainstem, from the fibers of the inferior colliculus and deep layers of the superior colliculus, and projects to the auditory cortex and adjacent insular and opercular fields. nucleus medialis magnocellularis corporis geniculati medialis