Abstract:
:Two opposing hypotheses on the homology of the avian brain suggest that the dorsal ventricular ridge of birds is comparable in certain respects either to the neocortex or to the claustroamygdalar complex of mammals. To help resolve this issue, we examined in adult chicken brains the gene expression of RORβ mRNA, a selective marker for layer IV of mammalian neocortex. RORβ mRNA was expressed in neurons of the chicken's visual entopallium and auditory field L2, but not in other regions of the nidopallium, hyperpallium, mesopallium or arcopallium. Together with hodological evidence of direct thalamic projections conveying primary sensory information to the entopallium and field L2, our results support the contention that these two regions are composed of neurons comparable to those in layer IV of mammalian neocortex.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Atoji Y,Karim MRdoi
10.1016/j.neulet.2012.05.068subject
Has Abstractpub_date
2012-07-19 00:00:00pages
119-24issue
2eissn
0304-3940issn
1872-7972pii
S0304-3940(12)00751-3journal_volume
521pub_type
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