Abstract:
:This study in lampreys (Lampetra fluviatilis L.) is concerned with the phylogenetic age of the suprachiasmatic nucleus of the hypothalamus which in mammals receives input from the retinohypothalamic tract and acts as circadian pacemaker. Tracing experiments with the fluorescent dye DiI demonstrated a retinohypothalamic projection in lampreys which terminates in a distinct area of the hypothalamus corresponding to the infrachiasmatic part of the nucleus of the postoptic commissure. Immunocytochemical investigations showed vasotocinergic neurons and a relatively high concentration of neuropeptide Y-, substance P- and serotonin-immunoreactive nerve fibers in this region. These hodological and immunocytochemical data suggest that the infrachiasmatic part of the nucleus of the postoptic commissure of lampreys might be homologous to the suprachiasmatic nucleus of other craniates.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Weigle C,Wicht H,Korf HWsubject
Has Abstractpub_date
1996-10-18 00:00:00pages
173-6issue
2-3eissn
0304-3940issn
1872-7972pii
0304-3940(96)13105-0journal_volume
217pub_type
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