ISSN:
1432-0878
Keywords:
Efferent neurosecretory fibers
;
Central nervous system, invertebrate
;
Circadian clock
;
Median eyes
;
Scorpion (Androctonus australis)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The central origin of efferent neurosecretory fibers (ENSF) supplying the median eyes of the scorpion, Androctonus australis, with circadian information was investigated at the light- and electron-microscopic levels by the use of several tracer techniques. The results obtained convincingly show that the central neurons stained via the optic nerve are the source of the ENSF in the retina. Almost all of these neurons give rise to two different axon collaterals, one of which projects into the ipsilateral, the other into the contralateral median-eye nerve. Three protocerebral contact zones of the ENSF system are described, and their functional role within the circadian clock system is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00219072
Permalink