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Ultrastructure of the dinoflagellate Polykrikos. II. The nucleus and its connections to the flagellar apparatus.
Electron microscopy of the colonial dinoflagellate Polykrikos kofoidi revealed a nuclear cortex formed of two electron-dense cortical layers directly beneath the nuclear envelope. Nuclear pores wereExpand
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The differentiation of nematocysts and associated structures in the cnidaria
  • J. Westfall
  • Biology, Medicine
  • Zeitschrift für Zellforschung und Mikroskopische…
  • 2004
SummaryThe differentiation of nematocysts and associated structures in the tentacles of the sea anemone Metridium senile fimbriatum and in the tentacles of medusae of the hydroid Obelia longissimaExpand
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Ultrastructural evidence for a granule-containing sensory-motor-interneuron in Hydra littoralis.
  • J. Westfall
  • Biology, Medicine
  • Journal of ultrastructure research
  • 1973
An electron microscopic survey of all identifiable neural tissue in Hydra littoralis has revealed the presence of a single type of central neuron having unique features. Except for its location nearExpand
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FINE STRUCTURE OF PHOTORECEPTORS IN THE HYDROMEDUSAN, POLYORCHIS PENICILLATUS.
  • R. Eakin, J. Westfall
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences…
  • 1 May 1962
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FINE STRUCTURE OF THE NOTOCHORD OF AMPHIOXUS
The protochordate amphioxus has been a favorite object of study for over a century. Early workers gave particular attention to the notochord of this remarkable animal because of its unique positionExpand
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Ultrastructure of synapses in the first-evolved nervous systems
  • J. Westfall
  • Biology, Medicine
  • Journal of neurocytology
  • 1996
SummaryThe phylum Cnidaria represents the first group of animals to evolve a recognizable nervous system. A comparison of the ultrastructural features of synaptic loci in animals representing allExpand
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FINE STRUCTURE OF THE EYE OF A CHAETOGNATH
Electron microscopy reveals a star-like pigment cell at the center of the eye of the arrow-worm, Sagitta scrippsae. Between the arms of the pigment cell are clusters of photoreceptor cell processes,Expand
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Neural pathways and innervation of cnidocytes in tentacles of sea anemones
Our previously published studies are here reviewed detailing neuro-cnidocyte synapses, demonstrating putative neurotransmitter substances, and identifying complex neural pathways in sea anemones.Expand
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ULTRASTRUCTURAL EVIDENCE OF POLARIZED SYNAPSES IN THE NERVE NET OF HYDRA
Synapses provide pathways of communication between cells throughout the animal kingdom wherever a nervous system is present. The most primitive or elementary nervous system that can be readilyExpand
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Ultrastructure of the dinoflagellate Polykrikos. I. Development of the nematocyst-taeniocyst complex and morphology of the site for extrusion.
Development of the nematocyst-taeniocyst complex in the four-zooid stage of a dinoflagellate, Polykrikos kofoidi, was studied by electron microscopy. We observed the following stages: formation ofExpand
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