Author
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Cook, Benjamin |
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Pryor, Nan |
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Submitted to: Journal of General Physiology
Publication Type: Abstract Only Publication Acceptance Date: 5/12/1995 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Twelve or more multipolar peripheral neurons are found along major branch nerves that enter the ovipositor of the stable fly, Stomoxys calcitrans (L.). Several are suspended in the haemocoel while others are in close proximity to the surface of the oviduct. Some peripheral neurons contained an abundance of neurosecretory granules that ranged in size from 32 nm to 180 nm in diameter. No glial elements enveloped the perikarya of such cells. Neurosecretory axons were usually found in the boundary region of large nerves just beneath the stroma. Peripheral nerve cells in close apposition to oviduct muscles were generally non-neurosecretory and were ensheathed in a glial perineurium. Peripheral neurons were occasionally surrounded by an extensive network of extracellular spaces in the glial perineurium. Other smaller neurons were found within large nerve trunks. Nerve-muscle junctions contained large clusters of synaptic vesicles and occasionally included small groups of neurosecretory granules. Many nerve terminals on the surface of the oviduct contained a complex postsynaptic folding of sarcolemma. Active transmission sites were indicated by increased densities along the neurolemma. Some neurohemal release sites were also evident. The biphasic and arrhythmic character of spontaneous neural activity on the intact median abdominal nerve trunk of the stable fly is quite similar to that found in other insects. Even the pattern of recurrent bursts has been noted. Intrinsic neural activity in the branch nerves near the common oviduct were explored for endogenous activity. Most preparations showed a variety of potential types which suggests that the signals were being transmitted from several different nerve cells. |
