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About: Retinohypothalamic tract     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:AnatomicalStructure, within Data Space : dbpedia.org associated with source document(s)

Type: Thingwikidata:Q4936952anatomical structure New Facet based on Instances of this Class

In neuroanatomy, the retinohypothalamic tract (RHT) is a photic neural input pathway involved in the circadian rhythms of mammals. The origin of the retinohypothalamic tract is the intrinsically photosensitive retinal ganglion cells (ipRGC), which contain the photopigment melanopsin. The axons of the ipRGCs belonging to the retinohypothalamic tract project directly, monosynaptically, to the suprachiasmatic nuclei (SCN) via the optic nerve and the optic chiasm. The suprachiasmatic nuclei receive and interpret information on environmental light, dark and day length, important in the entrainment of the "body clock". They can coordinate peripheral "clocks" and direct the pineal gland to secrete the hormone melatonin.