Self-innervation of dendrites in the rat suprachiasmatic nucleus.
Golgi-Cox impregnantions of the  rat suprachiasmatic nucleus show small dendritic side branches which appear to contact their neurons of origin. Electronmicroscopically a dendrite has been found forming a Gray-type-II synapse with one of its own branches. The arrangement is discussed as a general phenomenon of a feedback connection for temporal limitation of local excitation.
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D003712:Dendrites / Q000648:ultrastructure*; D005260:Female; D007031:Hypothalamus / Q000033:anatomy & histology*; D009900:Optic Nerve / Q000033:anatomy & histology; D051381:Rats; D013495:Supraoptic Nucleus / Q000033:anatomy & histology*; D013569:Synapses / Q000648:ultrastructure*; D013572:Synaptic Vesicles / Q000648:ultrastructure; D014795:Visual Pathways / Q000033:anatomy & histology