A LOCUST WIND AND OCELLAR BRAIN NEURONE

1.One of the large descending brain neurones in each half of the central nervous system of a locust is probably important in regulating the attitude of the locust9s flight in the pitch plane. This function is suggested by a consideration of the stimuli which excite the interneurones, and of the muscles whose motoneurones they excite. 2. Each of these interneurones has its cell body in the protocerebrum and its axon descends the ipsilateral connective and has branches in all of the thoracic ganglia. 3. The interneurones are excited by currents of air directed at the front of the head. An increase in the intensity of light falling on the median ocellus causes a reduction in the frequency of spikes produced by stimulation of the wind-sensitive hairs, and a reduction in the intensity of this light causes an increase in the frequency of these spikes. 4. Each interneurone makes excitatory connexions with motoneurones of the subalar and dorsal longitudinal flight muscles ipsilateral to it.

[1]  Peter J. Simmons,et al.  Connexions between a movement-detecting visual interneurone and flight motoneurones of a locust. , 1980 .

[2]  Donald M. Wilson,et al.  Patterned Activity of Co-Ordinated Motor Units, Studied in Flying Locusts , 1962 .

[3]  L. Goodman,et al.  The projection of ocellar neurons within the brain of the Locust, Schistocerca gregaria , 2004, Cell and Tissue Research.

[4]  Michael O'Shea,et al.  The Anatomy of a Locust Visual Interneurone; the Descending Contralateral Movement Detector , 1974 .

[5]  R. Snodgrass The thoracic mechanism of a grasshopper, and its antecedents , 1929 .

[6]  J. S. Altman,et al.  A silver intensification method for cobalt-filled neurones in wholemount preparations , 1977, Brain Research.

[7]  J. Bacon,et al.  Wind interneurone input to flight motor neurones in the locust, Schistocerca gregaria , 1979, Naturwissenschaften.

[8]  J. Altman,et al.  Motor and sensory flight neurones in a locust demonstrated using cobalt chloride , 1974, The Journal of comparative neurology.

[9]  L. Goodman,et al.  Ocellar connections with the ventral nerve cord in the locust,Schistocerca gregaria: Electrical and anatomical characteristics , 2004, Journal of comparative physiology.

[10]  Martin Wilson Generation of graded potential signals in the second order cells of locust ocellus , 1978, Journal of comparative physiology.

[11]  K. Pearson,et al.  Correlation of variability in structure with variability in synaptic connections of an identified interneuron in locusts , 1979, The Journal of comparative neurology.

[12]  M. Burrows,et al.  Connections between descending visual interneurons and metathoracic motoneurons in the locust , 1973, Journal of comparative physiology.

[13]  M. O’Shea Two sites of axonal spike initiation in a bimodal interneuron , 1975, Brain Research.

[14]  C. Goodman Anatomy of locust ocellar interneurons: Constancy and variability , 1974, Journal of comparative physiology.

[15]  J. Bacon,et al.  The tritocerebral commissure giant (TCG): A bimodal interneurone in the locust,Schistocerca gregaria , 1978, Journal of comparative physiology.

[16]  C. Goodman,et al.  Anatomy of the ocellar interneurons of acridid grasshoppers , 1976, Cell and Tissue Research.

[17]  G. E. Gregory Neuroanatomy of the mesothoracic ganglion of the cockroach Periplaneta americana (L.). I. The roots of the peripheral nerves. , 1974, Philosophical transactions of the Royal Society of London. Series B, Biological sciences.

[18]  C. Goodman,et al.  Anatomy of the ocellar interneurons of acridid grasshoppers , 1976, Cell and Tissue Research.