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O F David

Publications and source records attributed to O F David.

4 recordsLinked to original sources
PubMedDate not supplied

[Structure-functional features of peripheral nerve elements in oligochaetes].

Histological investigation of the peripheral nervous elements in the earthworm indicates that in 3-projection neurons which are found along the I and III segmentary nerves, one of the projections terminates between epithelial cells, whereas the other produces many ramifications which form multiple terminations in the longitudinal muscles. These polyvalent neurons presumably serve as a morphological basis for the peripheral axon-reflex in the earthworm.

Animals↗
PubMedDate not supplied

[Neural control of somatic muscle function in the earthworm, Allobophora longa, and in the leech, Hirudo medicinalis].

Studies have been made on the electrical activity of the segmentary nerves and connectives of the abdominal nervous chain in the earthworm and leech. It was shown that the electrical activity of the isolated piece of the abdominal chain of the leech is manifested of periodic outbursts of impulsation. Presumably this central periodicity accounts for the discharge-like pattern of muscle rhythmic activity which was revealed in our earlier investigations. The electrical activity in the central nervous system of the earthworm depends on afferent influences which pass to the ganglia from the peripheral sensory nervous cells. Stimulation of the abdominal nervous chain did not result in extra discharges of muscle activity, but only affected some of the parameters of the latter.

Afferent Pathways↗