Journal ArticleDOI
Spinal motoneurons of the larval zebrafish.
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TLDR
Application of horseradish peroxidase to lesions of the muscles and the central nervous system of larval zebrafish Brachydanio rerio was used to identify several types of neurons present in the spinal cord.Abstract:
Application of horseradish peroxidase to lesions of the muscles and the central nervous system of larval zebrafish Brachydanio rerio was used to identify several types of neurons present in the spinal cord. The spinal cord was found to contain three distinct motoneuronal types: primary and secondary motoneurons that innervate the axial muscles, and pectoral fin motoneurons that innervate the muscles of the pectoral girdle. The cell types are similar to those described in larvae of other anamniote vertebrates. The axial muscles of t, given hemisegment are innervated by two or three primary motoneurons and a larger number of secondary motoneurons in the corresponding spinal segment, whereas fin muscles are innervated by a pool of motoneurons spanning several spinal segments.read more
Citations
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Segmental patterns of neuronal development in the chick hindbrain.
Andrew Lumsden,Roger J. Keynes +1 more
TL;DR: Identification of specific neuronal populations and their projections in the developing hindbrain reveals a segmental organization in which pairs of metameric epithelial units cooperate to generate the repeating sequence of cranial branchiomotor nerves.
Journal ArticleDOI
Hox genes and the evolution of vertebrate axial morphology.
TL;DR: A comparative study of the developmental patterns of homeobox gene expression and developmental morphology between animals that have homologous regulatory genes but different morphologies, which contributes a mechanistic level to the assumed homology of these regions in vertebrates.
Journal ArticleDOI
Development and axonal outgrowth of identified motoneurons in the zebrafish
TL;DR: The results suggest that this stereotyped temporal sequence of axonal outgrowth may play a role in defining the contacts between the Mauthner axon and the motoneurons; the behavior of growth cones in the periphery suggests that interactions with the environment, not timing, may determine path- finding and peripheral connectivity of the mot oneurons.
Journal ArticleDOI
The development of a simple scaffold of axon tracts in the brain of the embryonic zebrafish, Brachydanio rerio.
TL;DR: At 1 day, the zebrafish brain is impressively simple, with a few small, well-separated tracts but by 2 days the brain is already considerably more complex, supporting the notion that other axons play a crucial role in the guidance of early central nervous system (CNS).
Journal ArticleDOI
A topographic map of recruitment in spinal cord
TL;DR: An unexpected pattern of organization is revealed within zebrafish spinal cord that underlies the production of movements of varying speeds, and may be partly explained by concomitant dorso-ventral gradients in input resistance.
References
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Journal ArticleDOI
Heavy metal intensification of DAB-based HRP reaction product
TL;DR: This communication describes this modification and includes a much simpler and faster means of carrying out the reaction, simplified by adding the metal salts directly to the phosphate buffered DAB solution in concentrations that barely saturate the medium with the salts.
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The development and behavioral characteristics of the startle response in the zebra fish.
TL;DR: The behavioral responses of developing larvae of the zebra fish to vibratory stimulation are described and it is suggested that the usual response may be due to a wave of muscular contractions along one side of the larva, as would be expected to result from an action potential in a Mauthner cell.
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Brain neurons which project to the spinal cord in young larvae of the zebrafish.
TL;DR: A small number of brain neurons project to caudal levels of the spinal cord in the larva of the teleostydanio rerio by backfilling with horseradish peroxidase following transection of the cord at the level of the cloaca.
Journal ArticleDOI
Chemically Mediated Transmission at a Giant Fiber Synapse in the Central Nervous System of a Vertebrate
TL;DR: Findings suggest that even a small spike releases most of an immediately available store of transmitter in the hatchetfish, suggesting that the probability of release by a single spike is high for any quantum of transmitter within this store.
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Spinal cord development in anuran larvae: I. Primary and secondary neurons
TL;DR: Primary motoneurons that innervate the tadpole tail were not found in the adult, although those innervating thoracic musculature persisted, as did at least somePrimary neurons projecting to other spinal segments or brainstem are replaced or maintained through metamorphosis depending on their class and location.