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  • 1
    Electronic Resource
    Electronic Resource
    Two antagonistic functions of neural groups of the femoral chordotonal organ underlie thanatosis in the cricket Gryllus bimaculatus DeGeer (1999)
    Springer
    Journal of comparative physiology 185 (1999), S. 143-155 
    Details
    ISSN: 1432-1351
    Keywords: Key words Femoral chordotonal organ ; Thanatosis ; Catalepsy ; Cricket ; Gryllus bimaculatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The cricket Gryllus bimaculatus displayed freezing (thanatosis) after struggling while the femoro-tibial joints of the walking legs were forcibly restrained. Myographic recording indicated that strong contraction of the flexor tibia muscle “leg flexion response” occurred under this restrained condition. During thanatosis, when the femoro-tibial joint was passively displaced and held for several seconds, it maintained its new position (catalepsy). Only discharge of the slow flexor units was mechanically indispensable for maintaining thanatosis and catalepsy. Differing roles of identified neuron subgroups of the femoral chordotonal organ were elucidated using this behavioral substrate. Ablation of the dorsal group neurons in the ventral scoloparium strengthened the leg flexion response and the normal resistance reflex, while ablation of the ventral group weakened both motor outputs. Ablation of the dorsal scoloparium neurons, or other main sensory nerves caused no detectable deficiency in femoro-tibial joint control. These results imply that both modes of flexor muscle activation promoted by the ventral group neurons are normally held under inhibitory control by the dorsal group. It is hypothesized that this antagonistic function causes immobilization of the femoro-tibial joint in a wide range of angles in thanatosis and catalepsy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050373
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  • 2
    Electronic Resource
    Electronic Resource
    A locust chordotonal organ coding for proprioceptive and acoustic stimuli (1999)
    Springer
    Journal of comparative physiology 184 (1999), S. 169-183 
    Details
    ISSN: 1432-1351
    Keywords: Key words Insects ; Behaviour ; Electrophysiology ; Mechanoreceptors ; Sensory neuropiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A chordotonal organ in the prothoracic segment of a locust combines features of a proprioceptive mechanoreceptor and an acoustic organ. This organ is closely associated with the tracheal system in the neck. The central nervous projections of the sensory cells contact neuropiles in all thoracic ganglia with the most dense arborizations in the metathoracic ganglion in close proximity, and even with some overlap, to the projections of tympanic fibres. Physiological experiments show that this organ responds to mechanical displacement of its receptor apodeme and, in addition, to acoustic stimulation via either a region of the cervical membrane which may act as a functional tympanic membrane, or via the tracheal system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050316
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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