Cytoarchitectonic study of the brain of a dwarf snakehead, Channa gachua (Ham.). I. The telencephalon

Abstract

Cytoarchitectonic pattern of the telencephalon of a dwarf snakehead, Channa gachua, is studied by serial transverse sections of the brain (Kluver and Barrera staining). On the anteriormost extremity of the telencephalon, olfactory bulbs terminate that are sessile. The olfactory bulbs comprise four concentric layers, which from outside toward the center are olfactory nerve layer, a glomerular layer, mitral cell layer, and internal cell layer. Large terminal nerve ganglion cells are prominently visible in the dorsomedial position where the bulbs terminate on the telencephalon. In all, 24 nuclei are identified in the telencephalon on ventral and dorsal areas and are named according to their position. Ventral telencephalon exhibits 11 nuclei. On the dorsal telencephalon, there are 13 nuclei. These again are named according to their position on dorsal, ventral, median, lateral, or posterior part. This study reported for the first time in this fish will be useful in tracing the neuronal system of Channa gachua and subsequent studies of the functional aspects of these nuclei in the regulation of reproductive cycle of this species.

Cytoarchitecture of the Telencephalon in the Coral Reef Multiband Butterflyfish (<b><i>Chaetodon multicinctus</i></b>: Perciformes)

“…The NT of most other perciform fishes is located ventral to the caudal portion of the Dlv2 and in many cases rostral to the Dp [e.g. Cerdá-Reverter et al, 2001;Muñoz-Cueto et al, 2001;Burmeister et al, 2009;Baile and Patle, 2011]. In C. multicinctus, this location is occupied by the Dlv1, a cell region with very uniform cytoarchitecture throughout its rostral-caudal extent.…”

“…This makes them an ideal group to identify behaviorally relevant circuits as well as evolutionary processes that might shape brain function. However, one key impediment is that the cytoarchitecture of the perciform fish telencephalon is only described in detail for a few species (the serranid Serranus scriba [Rakic and Lazarevic, 1977]; two centrarchids, Lepomis cyanellus [Northcutt and Davis, 1983] and Lepomis gibbosus [Fortuyn, 1961]; the osphronemid Betta splendens [Marino-Neto and Sabbatini, 1988]; the moronid Dicentrarchus labrax [Cerdá-Reverter et al, 2001]; the sparid Sparus aurata ; the channid Channa gachua [Baile and Patle, 2011], and a single cichlid, Astatotilapia burtoni [Burmeister et al, 2009]). Detailed descriptions of the telencephalon of behaviorally diverse basal and derived species are important for the development of hypotheses relevant to brain evolution, neural development, comparative function and proximate mechanisms of behavior [Braford, 2009].…”

The Cytoarchitecture of the Telencephalon of Betta Splendens Regan 1910 (Perciformes: Anabantoidei) with a Stereological Approach to the Supracommissural and Postcommissural Nuclei

“…That is, in the Lepomis cyanellus , the GCTN are scattered along the ventromedial surface of the OB (Northcutt and Bradford, ) and, in the Ictalurus punctatus , they can be identified in a ventromedial position in the olfactory nerve fiber layer, rostrally in the OB (Bass, 1981). In the Dicentrarchus labrax , Channa gachua , and Trachurus japonicas , the GCTN occupy a caudomedial position in the OB (Cerdá‐Reverter et al, ; Baile and Patle, ; Ou and Yamamoto, ). In the Carassius auratus , the GCTN send both peripheral terminals to the olfactory epithelium and central projections to the Vv, Vs, POA, TO, hypothalamus, and retina, which suggests the participation of these OB cells in a network controlling the reproductive behavior (Demski and Northcutt, ; von Bartheld and Meyer, ; Fujita et al, ).…”

“…Here, the LSO was identified and characterized by the first time in the B. splendens . This structure was described before in the D. labrax (Cerdá‐Reverter et al, ) and the C. gachua (Baile and Patle, ). That name was used because it appears to be similar to the corresponding nucleus in the bird telencephalon, where the LSO is a circumventricular organ that may serve basic functions associated with photoreception (Kuenzel et al, ).…”

“…The nomenclature for the B. splendens telencephalic structures was based on the original work of Nieuwenhuys (), modified by Northcutt and Bradford (1980), and the reports of Cerdá‐Reverter et al (), Burmeister et al (), Baile and Patle (), Dewan and Tricas (), and Ou and Yamamoto (). Components of the preoptic area (POA) were found as an anatomical continuum to the Tel.…”