Chondrostean Fishes

Nieuwenhuys, Rudolf

doi:10.1007/978-3-642-18262-4_14

Cited by 29 publications

(105 citation statements)

References 65 publications

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“…Its volume, similar to other actinopterygions, is inferior to that of the other parts of brain and is influenced by habitat requirements and behaviours (Nieuwenhuys, 1998). Since this fish lives in the middle depth of sea, the midbrain was less developed compared to other rayfinned fish (Nieuwenhuys, 1998). The optic tectum was observed from one day of the age and was separated from tegmentum by the tectal ventricle.…”

Section: Discussionmentioning

confidence: 91%

“…The midbrain in H. huso larvae as in other fish and vertebrates consists of a dorsal optic tectum, ventral tegmentum and few appendicular structures as sacus and torus. Its volume, similar to other actinopterygions, is inferior to that of the other parts of brain and is influenced by habitat requirements and behaviours (Nieuwenhuys, 1998). Since this fish lives in the middle depth of sea, the midbrain was less developed compared to other rayfinned fish (Nieuwenhuys, 1998).…”

Section: Discussionmentioning

confidence: 92%

“…Chondrostei are a major group of rayfinned fishes whose midbrain is protected by cartilage, bone, primitive meninx membrane and adipose tissue which fills mainly partition of cavity (Nieuwenhuys, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Some differences have a phylogenetic importance and show them- selves in the complexity and density of the organ and others can be shown in the development of specific sensory and motor function (Nieuwenhuys, 1998). The midbrain in H. huso larvae as in other fish and vertebrates consists of a dorsal optic tectum, ventral tegmentum and few appendicular structures as sacus and torus.…”

Section: Discussionmentioning

confidence: 99%

“…Both structures are involved in multimodal sensory integration and sensory motor coordination (Nieuwenhuys, 1998). Optic tectum is a visual structure (Eastman & Lannoo, 1995) and consists of a singular lobe in most species (Butler & Hodos, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Midbrain morphogenesis in beluga sturgeon (Huso huso) larvae

Tavighi¹,

Saadatfar²,

Shojaei³

et al. 2018

BJVM

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The subject of this study was the development of midbrain in beluga sturgeon (Huso huso) larvae. To this end, 36 larvae (6 larvae of each age) were fixed in 10% buffered formalin, dehydrated in an ethanol series, cleared in xylene and embedded in paraffin. The larvae brain were very small in size, total head was fixed and sited in paraffin blocks. Serial sections (6 µm thick) were stained with haematoxylin & eosin, Luxol fast blue, cresyl echt violet and PTAH Mallory for histological studies by light microscope. A stereological study was done by the Cavalieri principle to estimate the different areas of the midbrain, about 10 sections from each specimen were selected and photographed by a camera attached to the light microscope Olympus CX22. From 1 day of age, the two parts of midbrain, optic tectum and tegmentum were obvious. There was an area between these parts called Torus semicircularis. In 6-day-old larvae, the optic tectum cell layers were partially observed and in 54-day-olds, the optic tectum occupied the largest volume of midbrain (12.16±0.07 mm 3 ). Tectal ventricle in H. huso larvae was observed from the first day. The tegmentum was located in the ventral part of the midbrain and in its dorsal part joined the hindbrain and contained some nuclei. Stereological results showed significantly distinctive regional differences in midbrain volume (P<0.05). In conclusion, according to the present research, the evolution of midbrain in H. huso was related to ecological activities and in comparison with other ray-finned fishes was not very developed.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Midbrain morphogenesis in beluga sturgeon (Huso huso) larvae

Tavighi¹,

Saadatfar²,

Shojaei³

et al. 2018

BJVM

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Distribution of choline acetyltransferase (ChAT) immunoreactivity in the central nervous system of a chondrostean, the siberian sturgeon (Acipenser baeri)

2000

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All studies to date of cholinergic systems of bony fishes have been done in teleosts. To gain further insight into the evolution of the cholinergic systems of bony fishes, we have studied the brain of a chondrostean fish, the Siberian sturgeon (Acipenser baeri, Brandt), by using an antibody against choline acetyltransferase (ChAT). This study showed the presence of ChAT-immunoreactive (ChAT-ir) neurons in the preoptic region (parvocellular and magnocellular preoptic nuclei and suprachiasmatic nucleus), the periventricular and tuberal hypothalamus, the saccus vasculosus, the dorsal thalamus, and the habenula. The mesencephalic tegmentum contained ChAT-ir cells in the torus semicircularis and torus lateralis. The isthmus contained several cholinergic populations: the nucleus isthmi, the lateral nucleus of the valvula, the secondary visceral nucleus, and the dorsal tegmental nucleus. The motor neurons of the cranial nerves and the spinal motor column were strongly immunoreactive. The medial (sensory) trigeminal nucleus also contained a ChAT-ir neuronal population. The distribution of ChAT-ir neurons in the sturgeon brain showed some notable differences with that observed in teleosts, such as the absence of cholinergic cells in the telencephalon and the optic tectum. Several brain regions were richly innervated by ChAT-ir fibers, particularly the telencephalon, optic tectum, thalamus, posterior tubercle, and interpeduncular nucleus. The hypothalamo-hypophyseal tract, the tract of the saccus vasculosus, the fasciculus retroflexus, and an isthmo-mesencephalo-thalamic tract were the most conspicuous cholinergic bundles. Comparative analysis of these results suggests that teleosts have conserved most traits of the cholinergic system of the sturgeon, having acquired new cholinergic populations during evolution.

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Olfactory projections in a chondrostean fish,Acipenser baeri: An experimental study

Huesa

Anadón²,

Yáñez³

2000

J. Comp. Neurol.

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The presence of extrabulbar primary olfactory projections has been well established in teleosts. In order to investigate the phylogeny of these projections and to compare their targets with those of the secondary olfactory projections, the connections of the olfactory epithelium and olfactory bulb were studied by means of tract-tracing methods in a chondrostean, Acipenser baeri. Primary olfactory projections mainly extend to the glomerular layer of the olfactory bulb, but a significant number of extrabulbar efferent fibers course to various telencephalic and diencephalic regions. Both extrabulbar primary and olfactory bulb projections course in diffuse pathways. Extensive overlap was observed between the targets of these extrabulbar primary olfactory fibers and those of the secondary efferent projections of the olfactory bulb, though the latter were more numerous and reached additional targets. Tracer application to the olfactory bulb also revealed a number of bulbopetal neurons in the ipsilateral and contralateral telencephalic areas, as well as crossed interbulbar projections. The presence in a chondrostean of important extrabulbar primary projections and their extensive overlap with secondary olfactory projections suggest that such projections are a derived characteristic of bony fishes.

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Chondrostean Fishes

Cited by 29 publications

References 65 publications

Midbrain morphogenesis in beluga sturgeon (Huso huso) larvae

Midbrain morphogenesis in beluga sturgeon (Huso huso) larvae

Distribution of choline acetyltransferase (ChAT) immunoreactivity in the central nervous system of a chondrostean, the siberian sturgeon (Acipenser baeri)

Olfactory projections in a chondrostean fish,Acipenser baeri: An experimental study

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