Locust dorsal unpaired median (DUM) neurones directly innervate and modulate hindleg proprioceptors

Coupling of efferent neuromodulatory neurons to rhythmical leg motor activity in the locust.

The spike activity of neuromodulatory dorsal unpaired median (DUM) neurons was analyzed during a pilocarpine-induced motor pattern in the locust. Paired intracellular recordings were made from these octopaminergic neurons during rhythmic activity in hindleg motor neurons evoked by applying pilocarpine to an isolated metathoracic ganglion. This motor pattern is characterized by two alternating p...

Octopaminergic dorsal unpaired median (DUM) neurones innervating the colleterial glands of the female cockroach Periplaneta americana

The musculature of the colleterial glands receives innervation from branch 4B4a of the nerves designated 4B, which arise from the posterior part of the terminal abdominal ganglion in the female cockroach Periplaneta americana (L). Using Methylene Blue staining, the gross anatomy of the colleterial gland innervation has been described. Cobalt backfilling via branch 4B4 of nerve 4B revealed about...

Synaptic activation of efferent neuromodulatory neurones in the locust Schistocerca gregaria.

The segmental ganglia of the locust contain efferent neuromodulatory neurones with cell bodies at the dorsal midline and axons that supply muscles and other tissue on both sides of the body. These are the dorsal unpaired median (DUM) neurones. Intracellular recordings were made from pairs of known metathoracic efferent DUM neurones in locusts in which all nerves were intact and in isolated meta...

The electrical activity of the dorsal unpaired median neurone: past directions

past directions Historically, many electrophysiological studies performed in vivo indicated that the somata of some insect neurones were electrically inexcitable (Hoyle and Burrows, 1973) or displayed only attenuated action potentials (Crossman et al., 1971) that corresponded, sometimes, to electrical activity propagated electrotonically from more or less distant regions of active membrane. How...

Locust thoracic dorsal unpaired median (DUM) neurons: Differential activation and peripheral distribution of octopamine and tyramine