Abstract：
:Forebrain serotonin relevant for many psychological disorders arises in the hindbrain, primarily within the dorsal and median raphe nuclei (DR and MR). These nuclei are heterogeneous, containing several distinct groups of serotonin neurons. Here, new insight into the afferent and efferent connectivity of these areas is reviewed in correlation with their developmental origin. These data suggest that the caudal third of the DR, the area originally designated B6, may be misidentified as part of the DR as it shares many features of connectivity with the MR. By considering the rostral DR independently and affiliating the B6 to the MR, the diverse subgroups of serotonin neurons can be arranged with more coherence into two umbrella groups, each with distinctive domains of influence. Serotonin neurons within the rostral DR are uniquely interconnected with brain areas associated with emotion and motivation such as the amygdala, accumbens and ventral pallidum. In contrast serotonin neurons in the B6 and MR are characterized by their dominion over the septum and hippocampus. This distinction between the DR and B6/MR parallels their developmental origin and likely impacts their role in both behavior and psychopathology. Implications and further subdivisions within these areas are discussed.
journal_name
Brain Struct Functjournal_title
Brain structure & functionauthors
Commons KGdoi
10.1007/s00429-015-1176-7subject
Has Abstractpub_date
2016-09-01 00:00:00pages
3347-60issue
7eissn
1863-2653issn
1863-2661pii
10.1007/s00429-015-1176-7journal_volume
221pub_type
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