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  • 1
    Electronic Resource
    Electronic Resource
    Are the funnel-canal organs the ‘campaniform sensilla’ of the shore crab, Carcinus maenas (Decapoda, Crustacea)? (1984)
    Springer
    Cell & tissue research 237 (1984), S. 81-93 
    Details
    ISSN: 1432-0878
    Keywords: Funnel-canal organs ; Sensilla ; Chemoreceptors ; Mechanoreceptors ; Shore crab ; Carcinus maenas (Decapoda, Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The funnel-canal organs on the dactyls of the shore crab, Carcinus maenas, are innervated by 3–24 sensory cells with unbranched dendrites, which attain a length of 500–1400 μm. The outer dendritic segments are enclosed in a dendritic sheath and pass through the cuticle within a canal. Two dendrite types can be distinguished according to ultrastructural criteria: Type I has a long ciliary segment, A-tubules with an osmiophilic core and arms, and a thick ciliary rootlet. Type II possesses only a short ciliary segment and a thin ciliary rootlet. Each funnel-canal organ contains two type-I dendrites. Their ciliary bases appear a few μm distal to those of the type-II dendrites (1 to 22 in number). Two inner and two to eight outer enveloping cells belong to a sensillum. The innermost enveloping cell contains a large scolopale. In the second enveloping cell single scolopale rods are present. Thus, the funnel-canal organs are characterized by structural features typical for mechano-sensitive scolopidia, on the one hand, and for chemoreceptors, on the other. Therefore, the funnel-canal organs are very likely bimodal sensilla (contact chemoreceptors). A comparison with other arthropod sensilla shows that cuticular mechanoreceptors of aquatic crustaceans generally exhibit a ‘scolopidial’ organization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229202
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  • 2
    Electronic Resource
    Electronic Resource
    The hair-peg organs of the shore crab, Carcinus maenas (Crustacea, Decapoda): Ultrastructure and functional properties of sensilla sensitive to changes in seawater concentration (1989)
    Springer
    Cell & tissue research 257 (1989), S. 609-621 
    Details
    ISSN: 1432-0878
    Keywords: Sensilla ; Mechanoreceptors ; Chemoreceptors ; Sea water ; Shore crab, Carcinus maenas (Crustacea, Decapoda)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The hair-peg organs of the shore crab, Carcinus maenas, are modified hair-sensilla. A small hair shaft (peg) is surrounded by a tuft of solid cuticular bristles (hairs). Each hair-peg organ is innervated by 6 sensory neurons, 2 of which have “scolopidial” (type-I) dendrites. The outer segments of all dendrites pass through a cuticular canal extending to the articulated hair base in which the 2 type-I dendrites terminate. The other 4 (type-II) dendrites reach the clavate tip of the hair shaft and have access to a terminal pore and a large sickle-shaped aperture. Three inner and 8–12 outer enveloping cells belong to a hair-peg organ. The innermost enveloping cell contains a scolopale, which has desmosomal connections to the ciliary rootlets of the type-I dendrites. An inner and an outer sensillum lymph space are present. The ultrastructural features of the dendrites and the cuticular apparatus indicate that the hair-peg organs are bimodal sensilla, comprising 2 mechano- and 4 chemosensitive sensory neurons. Extracellular recordings from the leg nerve indicate that the chemosensitive neurons of the hair-peg organs respond to changes in seawater concentration in the physiological range of Carcinus maenas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221472
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  • 3
    Electronic Resource
    Electronic Resource
    Descending neurons with dopamine-like or with substance P/ FMRFamide-like immunoreactivity target the somata of olfactory interneurons in the brain of the spiny lobster, Panulirus argus (1994)
    Springer
    Cell & tissue research 278 (1994), S. 337-352 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Immunocytochemistry ; Dopamine ; Substance P ; Brain ; invertebrate ; Olfactory system ; Panulirus argus (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Two sets of descending neurons primarily target the somata of neurons in the olfactory deutocerebrum of the spiny lobster, Panulirus argus. Hundreds to thousands of dopamine-like immunoreactive fibers originate in the lateral protocerebrum and terminate among the clustered somata of the olfactory deutocerebrum projection neurons (lateral soma cluster) and those of the olfactory deutocerebrum local interneurons (medial soma cluster). A pair of giant neurons with substance P- and FMRFamide-like immunoreactivity from the median protocerebrum terminate primarily in the lateral soma cluster, but also branch in the core of the olfactory lobe itself. Neurons of both types terminate in numerous bouton-like swellings. The terminals in the lateral cluster at least contain numerous, large, dense-core and small, clear vesicles. The terminals contact the somata and the primary neurites through both traditional chemical synapses and large zones of direct membrane appositions. In most instances, a vesicle-containing profile forms a triadic arrangement with a neurite and a soma the latter being frequently connected via large gap-junction-like structures. Rosette-like arrangements formed by a vesicle-containing profile surrounded by up to eight neurites are also common. Dissociated lateral cluster somata support both fast inward and sustained outward voltage-activated currents. Substance P, but not dopamine or FMRFamide-related peptides, alters the fast inward current. The somata of the olfactory projection neurons, and possibly those of the olfactory local interneurons, appear to serve an integrative, and not merely a supportive role in these invertebrate central neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414177
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  • 4
    Electronic Resource
    Electronic Resource
    Immunocytochemical analysis of glomerular regionalization and neuronal diversity in the olfactory deutocerebrum of the spiny lobster (1997)
    Springer
    Cell & tissue research 287 (1997), S. 541-563 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Olfactory system ; (CNS) ; invertebrate ; Brain ; Dopamine ; Serotonin ; FMRF amide ; Substance P ; SCPB ; Panulirus argus (Crustacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Antibodies against serotonin, dopamine, FMRF amide, substance P, and molluscan small cardioactive peptide (SCPB) were used to differentiate glomeruli and neurons in the olfactory deutocerebrum of the spiny lobster, Panulirus argus. Immunoreactivity to these antibodies identified distinct regions within individual columnar glomeruli of the olfactory lobe (OL), but not within the spherical glomeruli of the accessory lobe (AL). Glomeruli in the lateral, central, and medial layers of the AL, however, had different patterns of immunoreactivity. The immunostainings differentiated six types of local interneurons and three types of centrifugal projection neurons. Local interneurons included: (1) a ”dorsal giant” neuron with serotonin- and FMRF amide-like immunoreactivity arborizing in most or all glomeruli of the OL, in the glomeruli of the medial and lateral layer of the AL and in the unstructured olfactory globular tract neuropil, (2) three large OL ”core” neurons, two with serotonin-like and one with FMRF amide-like immunoreactivity innervating many OL glomeruli, (3) several hundred small, globuli-type OL ”core” neurons with serotonin- and FMRF amide-like immunoreactivity, (4) thousands of small, globuli-type neurons with FMRF amide- and/or substance P-like immunoreactivity connecting the OL with the central layer of the AL, (5) thousands of small, globuli-type AL interneurons with substance P like immunoreactivity and additional arborizations in the unstructured deutocerebral tract neuropil, and (6) many small, globuli-type OL ”rim” neurons with FMRF amide- and/or SCPB-like immunoreactivity. Centrifugal projection neurons included two that targeted the soma clusters and a pair of large neurons with dopamine-like immunoreactivity that originated in the lateral protocerebrum and arborized in the OL and AL glomeruli. Only few ascending projection neurons and no olfactory afferents were labeled. These results suggest that in the spiny lobster neurochemically distinct subpopulations of local interneurons constitute functionally distinct regions within individual OL glomeruli and across groups of AL glomeruli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050778
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