Peripheral Thermal Receptors

Loftus, Richard

doi:10.1007/978-1-4684-3363-0_17

Cited by 22 publications

(8 citation statements)

References 59 publications

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“…Indeed, a decrease of 0.5°C in air temperature and an increase of 5% in humidity were sufficient to alter activities of DC1PNs and DC2PNs, respectively. The sensitivity of DC1PNs seemed to be similar to that of uniglomerular PNs participating in bimodal (olfactory and thermosensory) systems (Zeiner and Tichy, 2000) but slightly higher than that of receptors (Yokohari and Tateda, 1976;Loftus, 1978;Nishikawa et al, 1992), although accurate comparisons are difficult due to different stimulus procedures used in these studies. Further, terminals of DCPNs abut on terminal areas of uniglomerular PNs in the LP (Fig.…”

Section: Neural Algorithm For Processing Thermo-and Hygrosensory Signalsmentioning

confidence: 88%

Projection neurons originating from thermo‐ and hygrosensory glomeruli in the antennal lobe of the cockroach

Nishino

Yamashita

Yamazaki

et al. 2002

J of Comparative Neurology

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Most insects are equipped with specialized thermo- and hygroreceptors to locate a permissible range of ambient temperature and distant water sources, respectively. In the cockroach, Periplaneta americana, cold, moist, and dry receptor cells in the antennae send axons to particular sets of two or three glomeruli in the dorsocentral part of the antennal lobe (primary olfactory center), designated DC1-3 glomeruli. However, it is not known how thermo- and hygrosensory signals from these glomeruli are represented in higher-order centers, the protocerebrum, in any insect species. With the use of intracellular recording and staining techniques, we identified a new class of interneurons with dendrites almost exclusively in the DC1, DC2, or DC3 glomeruli and axons projecting to the protocerebrum in the cockroach. Remarkably, terminals of all these projection neurons (PNs) covered almost identical areas in the lateral protocerebrum (LP), although their termination areas outside the LP differed from neuron to neuron. The termination areas within the LP were distinct from, but close to, those of uniglomerular and macroglomerular PNs that transmitted signals concerning general odors and female sex pheromones, respectively. PNs originating from DC1, DC2, and DC3 glomeruli exhibited excitatory responses to cold, moist, and dry stimuli, respectively, probably due to excitatory synaptic input from cold, moist, and dry receptor cells, respectively, whereas their responses were often modulated by olfactory stimuli. These findings suggested that dorsocentral PNs participate in neural pathways that lead to behavioral responses to temperature or humidity changes.

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Section: Neural Algorithm For Processing Thermo-and Hygrosensory Signalsmentioning

confidence: 88%

Projection neurons originating from thermo‐ and hygrosensory glomeruli in the antennal lobe of the cockroach

Nishino

Yamashita

Yamazaki

et al. 2002

J of Comparative Neurology

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“…In most thermoreceptive sensilla, cold cells are found in combination with hygro-or chemoreceptors (Altner and Loftus 1985;Tichy and Gingl 2001). A warm and a cold cell in a single sensillum is the least common combination (Altner and Loftus 1985;Loftus 1978). One explanation is that such unimodal thermoreceptive sensilla are fewer in number than bimodal cold-receptive sensilla; another potential explanation is that the unimodal thermoreceptive sensilla are so delicate that the warm cell inside tends to escape sampling with the usual electrophysiological techniques.…”

Section: Introductionmentioning

confidence: 94%

“…In insects, ticks, and spiders, thermoreceptors are associated with cuticular sensilla, often in the form of sensory pegs or hairs that are located on the antennae and legs; this simplifies accessibility and identification (Altner and Loftus 1985;Altner and Prillinger 1980;Loftus 1978;Tichy and Gingl 2001). In most thermoreceptive sensilla, cold cells are found in combination with hygro-or chemoreceptors (Altner and Loftus 1985;Tichy and Gingl 2001).…”

Section: Introductionmentioning

confidence: 99%

Sensory Representation of Temperature in Mosquito Warm and Cold Cells

Gingl

Hinterwirth²,

Tichy³

2005

Journal of Neurophysiology

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A pair of antagonistic thermoreceptive cells is associated with each of two peg-in-pit sensilla located on the antennal tip of Aedes aegypti. One, the warm cell, responds to rapid warming with a sudden increase in the rate of discharge. The other, a cold cell, responds to rapid cooling with a sudden increase in the discharge rate. When temperature changes are provided by oscillating changes in the convective heat contained in the stimulating air stream, the oscillating discharge rates of both cell types are in advance of the oscillations in temperature and slightly behind the oscillations in the rate of temperature change. Analysis of these phase relationships shows that both cell types respond not only to the actual temperature at particular instance in time (instantaneous temperature) but also to the rate with which temperature changes. Individual responses are therefore ambiguous and signal tendencies rather than precise instantaneous values. When the temperature oscillations are delivered by changes in radiation power, however, the oscillating discharge rates of the warm and cold cells are in step with the oscillations in temperature. Here, individual responses signal instantaneous values of temperature rather than tendencies. The power of radiant heat required to modulate the discharge rates is relatively high, suggesting that infrared radiation is not a significant cue in distant host location.

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“…Possibly they are modified mechanoreceptors responding to hygroscopic swelling or shrinking of the cuticular apparatus (Yokohari, 1978). Least is known about structure-function correlations in thermoreceptors (for review see Loftus, 1978).…”

Section: Final Remarksmentioning

confidence: 99%