Aspects of Sensory Integration in the Crayfish Swimmeret System
نویسندگان
چکیده
منابع مشابه
Cholinergic modulation of the swimmeret motor system in crayfish.
1. The muscarinic agonist pilocarpine induced the swimmeret motor pattern in resting isolated preparations of the crayfish abdominal nerve cord and modulated the burst frequency in a dose-dependent manner. 2. Nicotine did not elicit rhythmic activity in resting isolated preparations but increased the burst frequency in active preparations. Nicotine produced higher burst frequencies than pilocar...
متن کاملMotor programme switching in the crayfish swimmeret system.
Intracellular and extracellular recordings have been made from neurones of the swimmeret system in the semi-isolated abdominal ganglion of the crayfish during rhythmic activity. Extracellular recordings commonly reveal a motor programme (MP1) consisting of low-amplitude symmetrical power and return stroke activity with phase-constant posterior-to-anterior intersegmental coordination. Occasional...
متن کاملThe Co-ordination of Swimmeret Movements in the Crayfish, Procambarus
Many Crustacea are characterized by the use of their appendages for swimming and feeding. In the lower Crustacea both the thoracic and abdominal appendages move for these purposes in a typical metachronal rhythm. The similar rhythmical movements found in the abdominal appendages of the crayfish (Hughes & Hickey, in preparation) are most probably based on similar nervous mechanisms, but here the...
متن کاملFive types of nonspiking interneurons in local pattern-generating circuits of the crayfish swimmeret system.
We conducted a quantitative analysis of the different nonspiking interneurons in the local pattern-generating circuits of the crayfish swimmeret system. Within each local circuit, these interneurons control the firing of the power-stroke and return-stroke motor neurons that drive swimmeret movements. Fifty-four of these interneurons were identified during physiological experiments with sharp mi...
متن کاملA test of the excitability-gradient hypothesis in the swimmeret system of crayfish.
The motor pattern that drives coordinated movements of swimmerets in different segments during forward swimming characteristically begins with a power-stroke by the most posterior limbs, followed progressively by power-strokes of each of the more anterior limbs. To explain this caudal-to-rostral progression, the hypothesis was proposed that the neurons that drive the most posterior swimmerets a...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1986
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.120.1.387