Neuronal Control of Ciliary Locomotion in a Gastropod Veliger (Calliostoma)

Intracellular recordings from pre-oral ciliated cells of competent Calliostoma ligatum veligers were used to demonstrate the mechanisms of neuronal control of ciliary locomotion. During normal ciliary beating at 5-7 Hz, the membrane potential shows no oscillations or spiking activity. It remains at...

Full description

Saved in:
Bibliographic Details
Published in:The Biological bulletin (Lancaster) 1987-12, Vol.173 (3), p.513-526
Main Authors: Arkett, S. A., Mackie, G. O., Singla, C. L.
Format: Article
Language:English
Subjects:
Action potentials
Beat frequencies
Biological and medical sciences
Calliostoma
Cilia
Depolarization
Electrodes
Fundamental and applied biological sciences. Psychology
Gastropoda
Invertebrates
Larvae
Locomotion
Marine
Membrane potential
Mollusca
Physiology
Physiology. Development
Sea water
Velar consonants
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Intracellular recordings from pre-oral ciliated cells of competent Calliostoma ligatum veligers were used to demonstrate the mechanisms of neuronal control of ciliary locomotion. During normal ciliary beating at 5-7 Hz, the membrane potential shows no oscillations or spiking activity. It remains at a resting potential of about -60 mV. Depolarization from resting potential is due to excitatory input from the CNS and, depending upon the kind of input, veligers appear to show two types of locomotory behavior. In one type, normal ciliary beating is periodically interrupted by rapid, velum-wide ciliary arrests. These arrests are caused by a propagated, Ca++-dependent action potential in the pre-oral ciliated cells. The second type is characterized by either a velum-wide or local slowing of normal ciliary beating, and appears to result from a slow depolarization of the ciliated cell membrane. Pre-oral ciliated cells are electrically coupled to each other. This property may ensure the synchrony of velumwide ciliary arrests or differential velar slowing of ciliary beating. These findings demonstrate some of the mechanisms of the fine control veligers possess over their locomotory and feeding behavior.
ISSN:0006-3185
1939-8697
DOI:10.2307/1541697