in the present experiment , horseradish peroxidase , injected intravitreously or applied to the cut optic nerve , consistently labeled a retinorecipient nucleus in the lateral hypothalamus in ringdoves , budgerigars , quails , starlings , and song sparrows , while a significant retinal input to a medial hypothalamic nucleus was absent in these species .
C0015392
optic
C0035298
retinal