Mechanical and chemical sensitivity at the mantle edge of the file clamLima scabra(Born)

Abstract

Crude starfish extracts or mechanical stimulation applied to the isolated mantle edge of Lima scabra evoked afferent impulse activity in the palliai nerves and local movements of the velum. The elicited spike activity was not a primary afferent response and the induced velum movements, which resembled jet formation on the mantle edge of intact clams, were apparently controlled by peripherally located neurons. Adductor muscle activity and efferent palliai nerve spikes were elicited by decreases in ambient illumination and by the application of mechanical stimulation or starfish extract to the mantle edge. Efferent impulse activity in the palliai nerves was correlated with protective movements of the mantle edge at the adduction. Similarities between the adductions evoked from L. scabra and scallop escape adductions are discussed.