2004
DOI: 10.1002/cne.11042
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Immunohistochemistry and neural connectivity of the Ov shell in the songbird and their evolutionary implications

Abstract: The neuropeptide immunohistochemistry and neural connectivity of areas surrounding the thalamic auditory nucleus (the nucleus ovoidalis [Ov]), as well as the areas to which it is connected, were investigated in a songbird, the Bengalese finch. The results showed that met-enkephalin was present in the Ov shell and most of the areas connected to it, but not in the Ov core. Anterograde and retrograde tracing studies showed that the Ov shell was more widely connected than the Ov core. The Ov shell was mainly conne… Show more

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Cited by 29 publications
(33 citation statements)
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“…One practical challenge to resolving the auditory inputs of the NIf is that it comprises a thin sheet of cells intimately embedded in Field L, the major auditory thalamorecipient zone in the bird's telencephalon (Durand et al, 1992;Vates et al, 1996;Zeng et al, 2004). The viral tracing methods used here show that CM axons terminate in NIf and include distinct swellings characteristic of synaptic boutons, confirming and extending previous studies by Vates et al (1996).…”
Section: Discussionsupporting
confidence: 83%
“…One practical challenge to resolving the auditory inputs of the NIf is that it comprises a thin sheet of cells intimately embedded in Field L, the major auditory thalamorecipient zone in the bird's telencephalon (Durand et al, 1992;Vates et al, 1996;Zeng et al, 2004). The viral tracing methods used here show that CM axons terminate in NIf and include distinct swellings characteristic of synaptic boutons, confirming and extending previous studies by Vates et al (1996).…”
Section: Discussionsupporting
confidence: 83%
“…Anatomical studies provide evidence for similar connectivity among superficial, intermediate, and deep processing regions in avian A1 and the corresponding neocortical layers (11,14,15,20,21). For example, avian A1 is organized into columns of radially arranged intrinsic connections spanning all regions, similar to columns connecting neocortical layers (14).…”
mentioning
confidence: 99%
“…This suggestion is consistent with two ideas presented in the literature: (1) the neural pathways consisting of auditory nuclei cores are exclusively devoted to auditory perception [Khachunts, 1982;Khachunts and Belekhova, 1986], whereas neural connections of the shell regions of auditory nuclei are involved in a wide variety of physiological activities such as auditory-mediated reactions, accompanying defensive, aggressive or emotional behaviors [Butler and Bruce, 1981;Khachunts, 1982;Khachunts and Belekhova, 1986]; (2) the auditory shell regions have many more diffuse neural connections than their cores, corresponding to their distinct physiological functions [reptiles: Pritz, 1974;Balaban and Ulinski, 1981;Pritz and Stritzel, 1992;birds: Durand et al, 1992;Zeng et al, 2004;mammals: Tawil et al, 1983;Morest and Oliver, 1984;Ledoux et al, 1985;Huffman and Henson, 1990]. Comparison of the projections in different taxa suggests that the diffuse connections of the surrounding areas of auditory nuclei are plesiomorphic [Huffman and Henson, 1990;Belekhova et al, 2002;Zeng et al, 2004]. Northcutt and Kaas [1995] proposed that the mammalian neocortex may have expanded numerous times from ancestral layered isocortex.…”
Section: Core-versus-shell Organization and Its Evolutionary Implicationmentioning
confidence: 99%
“…Auditory-evoked potentials and multi-unit activity have been recorded in the core and shell regions of auditory nuclei, suggesting that both regions process auditory information [reptiles: Khachunts, 1982;Khachunts and Belekhova, 1986;birds: Durand et al, 1992;Cheng and Havens, 1993;mammals: Syka et al, 2000]. There are, however, substantial differences between core and shell regions, specifically in electrophysiological properties [reptiles: Khachunts, 1982;Khachunts and Belekhova, 1986;birds: Wild et al, 1990;Durand et al, 1992;mammals: Aitkin and Webster, 1972;Tawil et al, 1983;Morest and Oliver, 1984;Huffman and Henson, 1990], cytoarchitecture [reptiles: Balaban and Ulinski, 1981;birds: Durand et al, 1992;mammals: Morest and Oliver, 1984;Huffman and Henson, 1990], and neural connections or neurochemistry [reptiles: Pritz, 1974;Balaban and Ulinski, 1981;Brauth and Reiner, 1991;Pritz and Stritzel, 1992;Belekhova et al, 2002;birds: Brauth and Reiner, 1991;Durand et al, 1992;Zeng et al, 2004;mammals: Tawil et al, 1983;Morest and Oliver, 1984;Ledoux et al, 1985;Huffman and Henson, 1990]. These data lead to two interesting questions: (1) What is the evolutionary relationship between the core and shell regions of the auditory nuclei?, and (2) How does the core/ shell organization evolve?…”
Section: Introductionmentioning
confidence: 99%