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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
The differentiation of nematocysts and associated structures in the cnidaria
  • J. A. 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
Ultrastructural evidence for a granule-containing sensory-motor-interneuron in Hydra littoralis.
TLDR
Evidence is presented that the unique neuron in Hydra littoralis is the ganglion, neurosensory, and neurosecretory cell described separately by others, and it is proposed to be called a sensory-motor-interneuron. Expand
FINE STRUCTURE OF PHOTORECEPTORS IN THE HYDROMEDUSAN, POLYORCHIS PENICILLATUS.
FINE STRUCTURE OF THE NOTOCHORD OF AMPHIOXUS
TLDR
Observations made with the electron microscope on the protochordate amphioxus, a remarkable animal because of its unique position and structure and its evolutionary significance, are presented. Expand
FINE STRUCTURE OF THE EYE OF A CHAETOGNATH
TLDR
The ciliary nature of the photoreceptor cell process in S. scrippsae points to a probable evolutionary relationship of chaetognaths to echinoderms and chordates, and the fine structure and function of these elements of the eye are discussed in relation to earlier studies with the light microscope. Expand
Ultrastructure of synapses in the first-evolved nervous systems
TLDR
The lack of postjunctional folds at neuromuscular synapses and the presence of fewer and somewhat larger synaptic vesicles in the more primitive animals suggests that neuropeptides evolved as neurotransmitters early in the animal kingdom. Expand
Neuropeptides in coelenterates: a review
TLDR
It was shown that all 4 peptides were located in neurones, many of which were associated with smooth muscle fibres, suggesting that these peptides are transmitters or modulators at neuromuscular junctions. Expand
Neural pathways and innervation of cnidocytes in tentacles of sea anemones
TLDR
Neural pathways included direct innervation of spirocytes by sensory cells, sequential neuro-neuro-spirocyte and neuro-Neuro-nematocyte synapses and reciprocal synapses involving axons of both sensory cells and ganglion cells, laying to rest the independent effector hypothesis for cnidocyte discharge in tentacles of sea anemones. Expand
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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