Habenular projections in the monitor lizard (Varanus benegalensis)

Experimental Brain Research
H Distel, S O Ebbesson

Abstract

The efferent connections of the medial (MHb) and the lateral (LHb) habenular nuclei in the monitor lizard were studied using experimental degeneration techniques. The MHb was found to project to the interpeduncular nucleus and the parvocellular nucleus of the superior raphe via the core portion of the habenulo-peduncular tract (HPT). The LHb fibers form the mantle portion of the HPT and curve laterally to collect again in the ventral tegmentum. From here, they follow either (1) the medial forebrain bundle to terminate in hypothalamus, ventromedial thalamus, preoptic area, and septum, or (2) they continue caudally to terminate in the superior raphe and paramedian reticular formation or (3) they decussate and follow in smaller numbers the ascending and descending pathways on the other side. Some fibers enter the midline and reach the periventricular zone of the midbrain. Short range projections exist to the dorsomedial thalamic nucleus and the paramedian central gray and pretectum. The habenular projections are bilateral, however, much smaller on the contralateral side. Although distinct terminal fields were not found in the substantia nigra and the central gray of the isthmic region, the overall pattern of habenular pathways is ...Continue Reading

Citations

Oct 23, 2012·Anatomical Science International·Hidenori Aizawa
Jan 1, 1994·Brain Research Bulletin·M BennisA Calas
Dec 29, 2011·Proceedings of the National Academy of Sciences of the United States of America·Marcus Stephenson-JonesSten Grillner
Mar 12, 2010·Connecticut Medicine·Edward J Volpintesta
Mar 29, 2012·Endocrinology·Satoshi OgawaIshwar S Parhar

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