Hyalomma dromedarii (Acari: Ixodoidea: Ixodidae): Central and peripheral nervous system anatomy

Marzouk, Aleya S.; Khalil, Galila M.; Mohamed, Fatma Ibrahim; Farid, N.

doi:10.1007/bf01270476

Cited by 4 publications

(2 citation statements)

References 19 publications

(45 reference statements)

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“…Through a novel electrophysiological approach, we were able to measure the neurological response of blacklegged ticks to chemical stimuli [ 20 ]. The synganglion used to study tick response represents the central nervous system of ticks where all the chemosensory inputs are processed [ 5 , 30 , 31 ]. Tick sensory organs are different from the standard olfactory system present in insects [ 32 ].…”

Section: Discussionmentioning

confidence: 99%

Chemosensory and Behavioural Responses of Ixodes scapularis to Natural Products: Role of Chemosensory Organs in Volatile Detection

Faraone

Light

Scott

et al. 2020

Insects

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Blacklegged ticks, Ixodes scapularis, represent a significant public health concern due to their vectoring of tick-borne disease. Despite their medical importance, there is still limited knowledge of the chemosensory system of this species, and thus a poor understanding of host-seeking behaviour and chemical ecology. We investigated the electrophysiological sensitivity of adult female blacklegged ticks to attractants and plant-derived compounds via an electrode inserted into the scutum. The response of female ticks to binary mixtures with a constant concentration of a selected attractant (butyric acid) and increasing concentration of volatile organic compounds (VOCs) (geraniol, phenethyl alcohol, β-citronellol, and citral) was recorded. A strict relationship between increasing volatile concentration and a decreasing response was observed for each VOC. Y-tube bioassays confirmed that tick attraction towards butyric acid decreased with the presence of a VOC, which exerted a deterrent effect. To determine the specific role of sensory appendages involved in the detection of attractant chemical stimuli, we tested tick electrophysiological response after removing appendages that house chemosensory sensilla (foretarsi, pedipalps, or both). The chemosensory response was related to the molecular structure of attractant odorant, and the lack of pedipalps significantly reduced olfactory responses, suggesting they play an important role in detecting attractants. This study provides new insight into the neurophysiological mechanisms underlying tick olfaction and the potential for interactions between attractant and deterrent chemical detection.

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Section: Discussionmentioning

confidence: 99%

Chemosensory and Behavioural Responses of Ixodes scapularis to Natural Products: Role of Chemosensory Organs in Volatile Detection

Faraone

Light

Scott

et al. 2020

Insects

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“…The general anatomical structures of the central nervous system have been described for several tick species (OBENCHAIN & OLIVER, 1976;MARZOUK et al, 1987;EL SHOURA, 1986;PRULLAGE et al, 1992;ROMA et al, 2012;SONENSHINE & ROE, 2014). In Argas persicus, the sensory projections of taste sensilla, located in the distal segment of the palp, extend to the subesophageal and palpal glanglia (SRIDHARAN et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Neuronal projections from the Haller's organ and palp sensilla to the synganglion of Amblyomma americanum§

Borges

Olafson

et al. 2016

Rev. Bras. Parasitol. Vet.

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The present study was conducted to elucidate the neuronal pathways between peripheral olfactory and taste sensilla and the synganglion in an Ixodidae tick species. The tarsus of the front legs (olfactory nerves) and the fourth palpal segment (gustatory nerves) of unfed Amblyomma americanum males and females were excised. A neuronal tracer, dextran tetramethylrhodamine, was used for filling of the sensory neurons. The synganglion preparations were examined using a confocal microscope. Neuronal arborizations from the Haller's organ were confined to the olfactory lobes and the first pedal ganglion. The estimated number of olfactory glomeruli ranged from 16 to 22 per olfactory lobe in the females. The number of glomeruli was not counted in males because they were densely packed. Sensory neurons associated with sensilla at the distal end of the palpal organ projected into the palpal ganglion in the synganglion through the palpal nerve. Gustatory sensory neurons associated with palpal sensilla projected into a commissure with several bulges, which are confined in the palpal ganglion. The findings of distinct projection patterns of sensory neurons associated with the Haller's organ and palpal organ in the lone star tick from this study advanced our knowledge on mechanisms of sensory information processing in ticks.Keywords: Chemical sensilla, neuronal projection, synganglion, Amblyomma americanum. ResumoO presente estudo foi conduzido para elucidar a trajetória neuronal, entre as sensilas periféricas olfativas e gustativas e o singânglio, em uma espécie de carrapato Ixodidae. O tarso da primeira pata (nervos olfativos) e o quarto segmento palpal (nervos gustativos) de machos e fêmeas não alimentados de Amblyomma americanum foram excisados. Um traçador neuronal, dextran tetrametilrodamina, foi usado para preenchimento dos neurônios sensoriais. Os singânglios foram examinados através de microscopia confocal. Arborizações neuronais do órgão de Haller foram confinadas nos lobos olfativos e primeiro gânglio pedal. O número estimado de glomérulos olfativos variou de 16 a 22 por lobo olfativo nas fêmeas. Em machos, o número de glomérulos não foi contado, pois eles estavam densamente compactados. Os neurônios sensoriais associados com as sensilas, na porção distal do órgão palpal, projetaram-se no no gânglio palpal do singânglio § This article reports the results of research only. Mention of a proprietary product does not constitute an endorsement or a recommendation by the USDA for its use. The USDA is an equal opportunity provider and employer. † Authors contributed equally.

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The correlation between tick (Ixodes persulcatus Sch.) questing behaviour and synganglion neuronal responses to odours

Romashchenko

Ratushnyak²,

Zapara³

et al. 2012

Journal of Insect Physiology

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Hyalomma dromedarii (Acari: Ixodoidea: Ixodidae): Central and peripheral nervous system anatomy

Cited by 4 publications

References 19 publications

Chemosensory and Behavioural Responses of Ixodes scapularis to Natural Products: Role of Chemosensory Organs in Volatile Detection

Chemosensory and Behavioural Responses of Ixodes scapularis to Natural Products: Role of Chemosensory Organs in Volatile Detection

Neuronal projections from the Haller's organ and palp sensilla to the synganglion of Amblyomma americanum§

The correlation between tick (Ixodes persulcatus Sch.) questing behaviour and synganglion neuronal responses to odours

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