Gravity response from angular acceleration receptors inOctopus vulgaris
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Single and multi-fiber responses were recorded from the nerves of the angular acceleration receptors (crista) ofOctopus vulgaris under the following conditions: (i) animal stationary, (ii) during angular acceleration from different resting positions relative to gravity, and (iii) during rotation at constant angular velocity. Rotations were around earth-vertical and earth-horizontal axes.
In all experiments the discharge frequency of the receptor neurons varied as a function of the orientation of the crista with respect to gravity (Figs. 1, 2).
The preparation excluded the possibility of interaction between the crista being observed and other equilibrium receptors; also, the perilymph-endolymph mechanics were not changed. Therefore, it is hypothesized that the angular acceleration receptors ofOctopus are responsive to linear acceleration (gravity) in addition to their well established sensitivity to angular acceleration.
KeywordsSemicircular Canal Angular Acceleration Linear Acceleration Constant Angular Velocity Impulse Frequency
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