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Journal of Experimental Biology 122,237-256 (1986)
Published by Company of Biologists 1986

The Morphology and Physiological Properties of the Small White Neurones in the Buccal Ganglia of Tritonia Hombergi

D. A. DORSETT 1

1 Marine Science Laboratories, Menai Bridge, Gwynedd LL59 5EH

The two small white (W) cells in the buccal ganglia of Tritonia hombergi can initiate and modulate cyclic activity in the pattern generating neurones which drive feeding activity in the buccal mass.

They also make extensive monosynaptic connections with the buccal motoneurones, generating EPSPs on protractor (P) cells, IPSPs on retractor (R) cells, and EIPSPs on the small radula flattener (F) cells. Two F motoneurones receive a chemically mediated, facilitating EPSP from the W cells.

Inactive W cells receive weak excitatory feedback from the pattern generating network interneurones (FPG) in phase I of the feeding cycle and also from some F cells. Prolonged depolarization of one W cell recruits the other. When both are active they adopt a patterned burst mode with a common inhibitory input in phase I.

Key words: Tritonia, feeding interneurones, modulation

Accepted on December 2, 1985






© The Company of Biologists Ltd 1986