Axons connecting one part of the cortex with another.
The axons entering any center and terminating there arouse that center to activity, and this activity, when aroused, is transmitted out along theaxons issuing from that center, and produces results where those axons terminate in their turn.
A nerve current, starting from the nerve cells in the reflex center, runs rapidly along the axons to the muscle and arouses it to activity.
The sensory axons from the skin, for example, terminate in the spinal cord, in what may be called the lowest sensory centers.
We have simply to think of one nerve center arousing another by means of the tract of axons connecting the two.
Here are nerve cells whose axons pass up through the cord and brain stem to the thalamus or interbrain, where they terminate in a second sensory center.
The remainder of the sensory axons are branches of nerve cells that lie in little bunches close alongside the cord or {33} brain stem.
These incoming axons terminate in end-brushes and so form synapses with the dendrites of the local {50} nerve cells.
From this synapsis the lower neurone proceeds, its axons travelling to the anterior horn and arborising around the motor cells.
Throughout this part of its course, numerous axons leave the tract, and enter the mid-brain, pons, and medulla in which lie the nuclei of the motor cranial nerves.
Some of these smaller stems can be traced to endings in the skin; these contain the axons connecting with sense organs.
The cables which contain the axons of both sensory and motor nerve cells extend from the brain or from the spinal cord out to the different parts of the body where the sense organs and the muscles are located.
These are the axons by which the muscles are aroused to activity.
Another thing which helps to keep the axons from being injured is that they are always in bundles.
Since we know that the nerve consists of a great many axons bundled together, we will realize that this subdivision is not a real branching, but simply a passing of some of the axons away from the main trunk along the smaller stem.
The bundles of axons corresponding to the telephone cables make up what we call the nerves.
When any sense organ is acted upon, as when light falls in the eye or sound on the ear, it starts a disturbance in some or all of the axons leading away from it.
This part of the axon is seen in the figure to have several branches; these are really branches of protoplasm and not separate axons coming off, as in the case of the nerve trunk.
A very complex organ, like the eye or the ear, has thousands of axons leading from it.
Some neurones in the human body, although visible only under the compound microscope, give rise to axons several feet in length.
Other axons originate in the central nervous system and pass outward as nerves producing movement of muscles.
At the base of these hairs are found neurones which send axons inward to the central nervous system.
Inside is a complicated nerve ending, and axons pass inward to the central nervous system.
Because some bundles of axons originate in organs that receive sensations and send those sensations to the central nervous system, they are called sensory nerves.
The "white matter" of the central system consists chiefly of axons with their enveloping or medullary, sheath and neuroglia.
Axons are slender, and branch but little, and then approximately at right angles.
Both dendrites and axons are of diameter so small as to be invisible except under the microscope.
These are known as non-medullated axonsand they have a gray instead of a white color.
Certain axons are also observed to give off branches before the place of termination is reached (Fig.
In certain parts of the brain, for example, are fibers not more than one one-hundredth of an inch in length, while the axons that pass all the way from the spinal cord to the toes have a length of more than three feet.
Certain of the axonshave no primitive sheath and others are without a medullary sheath.
To some extent, also, axons pass through ganglia with which they make no connection.
In the matter of length, great variation is found among the axons in different parts of the body.
Where the axons terminate they usually separate into a number of small divisions, thereby increasing the number of their connections.
Many of the axons in the brain and spinal cord have no primitive sheath.
Axons without the medullary sheath are found in the sympathetic nerves.
The cell-body is smooth and rounded, and its axons extend from it in opposite directions (Fig.
The axis cylinder is present in all axons and is the part essential to their work.
The axons lie side by side in the nerve, being surrounded by the same protective coverings, while the cell-bodies form a rounded mass or cluster, which is the ganglion (Fig.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "axons" in a variety of sentences. We hope that you will now be able to make sentences using this word.
