This theory of Duval's supposes that to some extent the neuronsor nerve cells are possessed of voluntary movement.
Each neuron does not extend to and from the brain and the periphery, but series of neurons connect the surface of the body with the brain.
According to his suggestion, sleep would be due to a separation of the neurons that run from the surface of the body to the brain cortex, because the various neurons had become too tired for further function.
For the time being, at least, the connection between the peripheral neurons and the central neurons is broken or but imperfectly made, and conduction does not take place, or is hampered.
This over excitation of neurons may come from without, or may come from within.
The central neuronsbecome either quite separated from certain of the peripheral neurons, or at least the connections are not made with that nice adjustment necessary for the proper passage of nerve impulses.
Duval, the French anatomist and histologist, suggested the possibility of voluntary and involuntary movement in the neurons or nerve cells themselves, thus making and breaking connections.
Hypnotism usually begins with a certain fatigue of peripheral neurons until these do not act normally, and then the cerebral neurons become, as it were, short-circuited on themselves with a consequent internal concentration of attention.
All his firing neurons once again became a cluster of pensive rumination.
Concentrating on where he was to allow the excesses of the saturation of sleep, a more temporary reality, to be shaken from his sodden neurons like wetness from an animal's fur, he then did nothing further.
Neurons are supposed to be of three classes, sensory to receive stimulations, motor to send out impulses to the muscles, and association to connect sensory and motor centres.
The cause for these changes seems to be that the neurons which chance to work together during any experience form connections with one another by means of their outgrowing fibres.
Ultimately, however, similar connections between sensory and motor neurons may be established in lower centres, whereupon the action will be performed as a reflex act, or without the intervention of a directing act of consciousness.
The arrangement of the neurons enables impulses to be started in certain parts of the nervous system, and the property of conductivity causes them to be passed as stimuli to other parts.
Neurons belonging to this class have each a well-defined cell-body and two axons, but no parts just like the dendrites of mon-axonic neurons.
The work of the neurons seems to depend mainly upon two properties—the property of irritability and the property of conductivity.
For stimulating the neurons not connected with the body surface we are dependent, so far as known, upon the nervous impulses.
The explanation of reflex action is that external stimuli start impulses in neurons terminating at the surface of the body and these, in turn, excite impulses in neurons which pass from the spinal cord or brain to the muscles (Fig.
To a considerable extent, neurons having their cell-bodies in the sympathetic ganglia are concerned in these actions (Fig.
Give two differences between the neurons and the other cells of the body.
The side-by-side plan is seen in that disposition of the neurons which enables them to form the nerves and the ganglia, as well as the brain and spinal cord.
The neurons which form these ganglia aid in controlling the vital processes, especially digestion and circulation.
Nowhere in the body do the neurons exist singly, but they are everywhere connected with each other to form the different structures observed in the nerve skeleton.
These consist of loose end-to-end unions of the fiber branches of certain neurons with the dendrites of other neurons.
As in the work of digestion, neurons having their cell-bodies in the sympathetic ganglia aid in the control of the circulation.
In eclampsia it diverts blood from the brain and depresses the motorneurons of the spinal cord.
The higher neurons have been stimulated into reflex activity twenty-five minutes after complete clinical cardiac cessation of activity.
Great Complexity in Associations and More Neurons in the Brain of Man Than of Other Animals.
It is believed that more or less resistance to transmission of stimuli prevails at the point of contact (synapse) between two neurons but that this resistance is lessened by repetition of conduction.
And since such talents are handed down to descendants, this can only mean that a similar grouping of the neurons in the region in question has occurred.
We must believe that to a considerable extent emotional expression, as well as other mental functions, is due to hereditary dispositions of the neurons in the various parts of the brain.
While the first man's left-hemisphere neurons were telling his right hand to reach downward, the sword was already moving, milliseconds ahead.
The neurons firing in his brain were setting in motion a sequence of logic.
It is a change in the neuronsand their connections.
It is the duty of physiology to elaborate such a clumsy scheme and to make us understand in detail how those processes in the neurons can occur and it is not the duty of psychology to develop detailed physiological hypotheses.
He recalled the neurons whose beady little eyes he had fancied he saw staring brightly into, as well as out of, his own.
The threshold fluctuations in the neurons always upset my mnemonic norm when I temporalize.
The various neuronssubserving the former or inferior function are cortical, and form the cortical polygon.
Physiological and clinical research necessitates the subdivision of this system into two groups--the neurons of psychical automatism, and the neurons of superior (i.
At the central end of the physiological ladder is the superior or cortical system of perception neurons whose cells form the grey matter of the convolutions.
Activity on the part of the inferior psychical neurons is seen: 1.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "neurons" in a variety of sentences. We hope that you will now be able to make sentences using this word.
