The structure of, and preliminary electrophysiological investigation upon, ciliated receptors in the Giant scallop, Placopecten maqellanicus (Gmelin)

Moir, Antony Jonathan Gordon (1976) The structure of, and preliminary electrophysiological investigation upon, ciliated receptors in the Giant scallop, Placopecten maqellanicus (Gmelin). Masters thesis, Memorial University of Newfoundland.

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Abstract

Studies have been carried out on the regeneration of the excised mantle eyes of the scallop Placopecten magellanicus (Gmelin). Many of the experiments performed by Butcher (1930) were repeated. The tentacles and the mantle cavity of the scallop have been examined for the occurrence of ciliated sense organs. When found these have been described anatomically. Preliminary physiological investigations have been made on the sense organs from the long tentacles. -- Results from the regeneration studies were negative. Two reasons have been suggested to explain the failure of these experiments; the water temperature was too low thus preventing regeneration, the species used in the present study is different from that used by Butcher. -- Examination of the tentacles has revealed a number of ciliated structures. A ciliated papilla found on both the long tentacles, in large numbers, and on the short tentacles, in small numbers has been extensively examined. Anatomical investigations in conjunction with preliminary physiological investigations suggest that the papillae subserve a sensory function and possibly respond to mechanical stimuli. A preliminary investigation of other ciliated structures on the short tentacles and the abdominal sense organ have been made. A chemosensory function is suggested for the structure of the receptors on short tentacles. The abdominal sense organ has no known function; several hypotheses are offered. -- A brief histological study of the anatomy of the circumpallial nerve has been made. The nerve displays a structure similar to that of the visceral ganglion.

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