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• W176966982 abstract "Fish fins are appendages which represent the limbs in higher vertebrates. In general, fishmoves in the water by body undulation with the assistance of fins. To date, most of thestudies focused on the innervations of limbs especially in mammals, such as rats, catsand monkeys. On the contrary, understanding on the innervations of the fish fin is stillat its infancy as studies on the relevant field are relatively scarce. Hence, this studyaimed to fill the knowledge gap, i.e. to investigate the organisation of spinal motorneurons in relation to the distribution of the median fins. For comparison purposes, fourspecies of juvenile fishes utilised in this study were divided into two groups, namely (i)fish with long and continuous dorsal fin (Channa micropeltes, toman and Clarias sp.,keli), and (ii) fish with short and non-continuous dorsal fin (Mystus nemurus, baung andPangasius sp., patin). Spinal cord tissue obtained from three different representativesegments along the rostro-caudal axis were processed histologically and stained usingthree neurohistological staining techniques including H&E, Nissl as well as Lillie’sVariant of the Weil-Weigert prior to light microscopy level observation. Theorganisation of motor neurons was correlated with the distribution of fins. Cell columnorganisation characterised the location of motor neurons into seven cell columns,namely intermediolateral (IL), dorsomedial (DM), ventromedial (VM), central (C),ventrolateral (VL), dorsoventral (DV) and retrodorsolateral (RDL) cell columns. It wasobserved that median motor neurons (IL, DM and VM cell columns) outnumberedcentral (C cell column) and lateral motor neurons (VL, DL and RDL cell columns) at allrostral, median, and caudal region of the fish body trunk. Medial motor neurons (IL andDM cell columns) were found in all three segments; thus, were probably innervating thebody trunk, for instance to aid in body undulation. On the contrary, DL motor neuronswere found only at the dorsal fin area of Clarias sp. and Pangasius sp.; thus, were probably innervating the particular fin. To further investigate the innervations of caudalfin muscles through HRP histochemistry, Clarias sp. with rounded caudal fin andPangasius sp. with forked caudal fin were selected from each group. The nerve trunks atthe caudal fin were transected and soaked in 50% HRP solution. After two days, eachfish was sacrificed and its spinal cord was freeze-sectioned using cryostat. The sectionswere stained using DAB Liquid Enhanced Substrate kit to reveal the motor neuronscontaining HRP in the cytoplasm which appeared as brownish precipitations. Most ofthe motor neurons innervating Clarias sp. rounded caudal fin were located medially atIL, DM and VM cell columns. In contrast, the motor neurons innervating forked caudalfin of Pangasius sp. were located mostly at the ventral areas, namely VM and VL cellcolumns. The differences of the motor neuronal organisation between the two speciescould be credited to further muscle differentiation in the caudal fin muscle layers ofPangasius sp., which exhibited more complicated organisation than that of the Clariassp. In conclusion, the findings of this study were in agreement with the existingliterature that medial motor neurons (IL and DM cell columns) innervate body trunkwhile more laterally located motor neurons (VM, VL and DL cell columns) innervatedistal structure, in this case the fins. Future research can focus, specifically, on theinnervations by individual nerve trunk or innervations of individual muscle and/or theresearch can be conducted at different stages of life cycle of the fish." @default.
• W176966982 created "2016-06-24" @default.
• W176966982 creator A5062315630 @default.
• W176966982 date "2012-01-01" @default.
• W176966982 modified "2023-09-27" @default.
• W176966982 title "Spinal motor neuronal organisation of selected local freshwater fishes in relation to median fin innervations / Kwong Soke Chee" @default.
• W176966982 hasPublicationYear "2012" @default.
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