• Corpus ID: 87564396

Observation on the Myo-Neural Physiology of the Polyclad, Planocera Gilchristi

  title={Observation on the Myo-Neural Physiology of the Polyclad, Planocera Gilchristi},
  author={Sheila A. Gruber and D. W. Ewer},
  journal={The Journal of Experimental Biology},
1. The behaviour of decerebrate specimens of Planocera gilchristi is compared with that of normal individuals in respect of locomotion, righting reactions, responses to mechanical stimulation, feeding and oviposition. It is found that the brain acts as a centre for co-ordination of locomotor activity but many other activities such as swallowing and egg laying can occur in the absence of the brain. 2. The responses to electrical stimulation of the longitudinal muscles of decerebrate individuals… 

Primitive nervous systems: peripheral habituation in decerebrate polyclad flatworms.

There appears to be a decrease in responsiveness which recovers when interstimulus intervals become longer than 5 sec, and this waning responsiveness can be dishabituated by applying a more intense vibration stimulus or with electrical shocks applied directly to the ventral nerve plexus.

Observations on the myo-neural physiology of a polyclad flatworm: inhibitory systems.

It is concluded that these relaxation and depressant effects reflect the presence of a true inhibitory system which also shows facilitation and is also required for transmission of the relaxation effect.

Activity and habituation in the brain of the polyclad flatworm Freemania litoricola.

  • H. Koopowitz
  • Biology, Psychology
    The Journal of experimental biology
  • 1975
The presence of a dual sensitizing and inhibitory system during habituation is discussed and vibration-evoked potentials appear to occur in at least second-order cells, since vibration responses are abolished by the application of MgCl2.

Electrophysiology of the peripheral nerve net in the polyclad flatworm Freemania litoricola.

A diffuse-conducting system close to the dorsal epithelium of the polyclad flatworm Freemania litoricola is described, and it is suggested that the animals either possess a unique Mg2+ insensitive synaptic nerve-net or else the network is electrically coupled.

Primitive nervous systems: electrophysiology of the pharynx of the polyclad flatworm, Enchiridium punctatum.

Electrical activity accompanying motor activity can be recorded from the excised pharynx of Enchiridium punctatum and the conduction involved with peristalsis is polarized and proceeds in a proximal direction.

Primitive nervous systems. Control and recovery of feeding behavior in the polyclad flatworm, Notoplana acticola.

Feeding behavior in Notoplana acticola involves a series of local responses which are under central control, and Worms are still able to ingest food in the absence of the brain using local reflexes.


Animals will respond to mechanical stimuli with ditaxic movements even if a series of cuts are made so that the stimulus must be propagated around lesions as in a nerve-net.

Primitive nervous systems: electrophysiology of inhibitory events in flatworm nerve cords.

Depression and the subsequent lifting of the inhibition occur in Ringer baths containing either normal sea water or equal mixtures of sea water and isotonic MgCl2.

On the evolution of central nervous systems: Implications from polyclad turbellarian neurobiology

The nervous system of the polyclad turbellarian Notoplana acticola consists of a series of nerve plexuses and a central ganglion, the brain. The brain contains a variety of cell types including

Multimodal interneurones in the polyclad flatworm,Alloeoplana californica

Two morphological types of interneurones were found in the brain of Alloeoplana californica that respond to water vibration and to light offset and form part of the neuronal circuitry underlying arousal.