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== Nucleus suprachiasmaticus et officium suum "horologium corporis internum" ==
{{main|Numerus circadianus}}
SCN cum circiter 20&thinsp;000 [[neuron]]ibus ''horologium centralis corporis principale'' nominatur.<ref>{{cite journal |authors=Herzog ED1, Hermanstyne T., Smyllie N. J., Hastings M. H. |title=Regulating the Suprachiasmatic Nucleus (SCN) Circadian Clockwork: Interplay between Cell-Autonomous and Circuit-Level Mechanisms |journal=Cold Spring Habor perspectives in biology |year=2017 |month=Ian |volume=9 |issue=1 |pages=a027706 |url=https://www.ncbi.nlm.nih.gov/pubmed/28049647}}</ref>. Signa ab [[Retina (anatomia)|retina]] per ''tractum retinohypothalamicum'' foris in nucleum veniunt. Quo fit, ut nucleus mores secundum cyclos diurnos animalis gubernat.
 
=== Coniunctio inter oculum et nucleum suprachiasmaticum ===
Receptoria [[melatoninum|melatonini]] in nucleo, circuitus [[retroactio]]nis, insunt.
In [[stratum ganglionicum retinae|strato ganglionico retinae]] mittunt [[cellula ganglionica Retinae intrinsice photosensitiva|''cellulae ganglionicae intrinsice photosensitivae'']] (ipCGR), quae [[melanopsinum]]<ref>{{cite journal |authors=McNeill D. S., Sheely C. J., et al. |title=Development of melanopsin-based irradiance detecting circuitry |journal=Neural development |year=2011 |month=Mar |volume=18 |pages=10.1186/1749-8104-6-8 |url=https://www.ncbi.nlm.nih.gov/pubmed/21418557}}</ref> exprimunt, [[axon]]es suos per [[tractus retinohypothalamicus|tractum hypothalamicum]] directe in nucleum suprachiasmaticum, ibi imprimis in partem ventrolateralem.
 
=== Cellulae partis ventrolaterals ===
Cellulae partis ventrolateralis quasi nucleus in sensu strictu sunt. Eae regulator spatii agunt osntendentes repetitiva et signa et expressio [[genum|geni]] ''cfos''. Receptoria [[melatoninum|melatonini]] in nucleo, circuitus [[retroactio]]nis, insunt.
 
== Notae ==