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Ultrastructure of cephalopod chromatophore organs
The surface of a retracted chromatophore is extensively folded, but upon contraction of the radial muscle fibers it becomes flattened and the folds of the surface disappear, indicating that the cell membrane cannot be responsible for the elasticity of the chrom atophore as claimed by earlier investigators.
Nervous system of ascidian larvae: Caudal primary sensory neurons
In larvae of Diplosoma macdonaldi one sensory nerve extends along the dorsal midline of the tail and another extended along the ventral midline and it is proposed that these cells are mechanoreceptors.
Ascidian Larvae and the Events of Metamorphosis
- R. A. Cloney
- 1 November 1982
The nervous system, neuroid conduction and diffusion of one or more humoral factors are probably all involved in controlling metamorphosis.
Chromatophore Organs, Reflector Cells, Iridocytes and Leucophores in Cephalopods
The chromatophore organs of Lohgo are each composed of five types of cells: a central pigment cell: radially arranged, obliquely striated muscle fibers: neuronal processes; glial cells: and an…
Patterns of morphogenesis mediated by dynamic microvilli: Chaetogenesis in Nereis vexillosa
The pattern of morphogenesis of the chitinous compound (jointed) setae of the larvae of polychaete Nereis vexillosa Grube was deduced from electron-microscopic analyses of many stages of secretion by inferring the precise size and shape of each complex seta is controlled by sequential modulations of the number, size, shape, arrangement and orientation of the microvilli of the chaetoblast.
Brachiopod tentacles: Ultrastructure and functional significance of the connective tissue and myoepithelial cells in Terebratalia
Experimental manipulations of a tentacle indicate that its movements are effected by the interaction of the tentacular contractile apparatus and the resilience of the supportive connective tissue cylinder.
Chiton integument: Ultrastructure of the sensory hairs of Mopalia muscosa (Mollusca: Polyplacophora)
The dorsal integument of the girdle of the chiton Mopalia muscosa is covered by a chitinous cuticle about 0.1 mm in thickness and the function of the hairs is unknown, and it is not determined whether the sensory cells are primary sensory neurons or secondary sensory cells.
Ascidian larval nervous system: Primary sensory neurons in adhesive papillae
It is inferred that papillar sensory cells allow a larva to sample the characteristics of the substrate at potential sites for settlement and metamorphosis.
The ultrastructure of venom‐producing cells in Paranemertes peregrina (Nemertea, Hoplonemertea)
The ultrastructure of the venom‐producing epithelium is examined before and after capture of nereid prey, and its distribution in the anterior proboscis chamber and body wall correlates with previous reports of toxin concentrations that were derived from assays of tissue extracts.
Cytoplasmic filaments and cell movements: epidermal cells during ascidian metamorphosis.
- R. A. Cloney
- BiologyJournal of ultrastructure research
- 1 February 1966