Mechanoreceptors in the oral tube and buccal mass of Philine aperta

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1. 1. A group of 12–16 neurons on the ventral surface of the buccal ganglion have been identified as primary mechanoreceptors. 2. 2. The receptors respond to tactile stimulation of the internal surfaces of the oral tube, buccal mass, radula and the 4 sensory patches surrounding the mouth. 3. 3. Individual receptors may have up to four separate sensory fields. 4. 4. A localized tactile stimulus adapts rapidly without affecting the excitability of surrounding regions of the field. 5. 5. The impulse propagates to all parts of the receptive field, and spike collision does occur. 6. 6. Conduction failure also occurs at axonal branch points with repetitive stimulation. 7. 7. Weak inhibitory and excitatory connexions were found with buccal motoneurons.