Pineal ribbon synapses: regulated by the gland's central innervation. Reuss S. Journal Article 2010; 31(6): 761-765 PubMed PMID: 21196915 Keywords: Animals, Circadian Rhythm:physiology, Male, Melatonin:secretion, Microscopy, Electron, Pineal Gland:physiology, Rats, Rats, Sprague-Dawley, Synapses:ultrastructure,. Citation OBJECTIVE: The pineal gland is part of the circadian clock system and is under the predominant influence of the endogenous oscillator loca..... Read abstract Full text PDF