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Updated: May 7, 2025
Such a fibril may have about it a protective covering, which is known as the sheath of Schwann; but the fibril itself is the essential nerve tract; and in many cases, as Remak presently discovered, the sheath is dispensed with, particularly in case of the nerves of the so-called sympathetic system.
In two pieces, specks, or rather paillettes, of gold were found lightly and loosely adhering to the "Maru ;" so lightly, indeed, that they fell off when carelessly pocketed Veins of schist still remained, but in the galleries they had been followed out to the uttermost fibril.
Each of the filaments jutting out from the cell is held, as before, to be indeed a transmitter of impulses, but a transmitter that operates intermittently, like a telephone wire that is not always "connected," and, like that wire, the nerve fibril operates by contact and not by continuity.
Some of these layers will disappear, but the most important ones, consisting of longitudinal and transverse fibres, will persist in higher forms. Locomotion by means of these muscles is slowly coming into prominence. They are no longer merely slaves of digestion. But a muscular fibril contracts only under the stimulus of a nervous impulse.
Each of the minute fibrils of the muscles has a small conducting nerve connecting it with the brain or spinal marrow, and in this respect each muscular fibril is separate from every other. When, therefore, the mind wills to move a flexor muscle of the arm, the gray matter sends out the stimulus through the nerves to the cells of each individual fibre of that muscle, and they contract.
Marteen's departure. Then why this fibril anxiety never to be long beyond call? Surely, and the demon in his brain laughed with amusement, he did not expect her to send him a cryptic wireless "Everything arranged; operation a success; appendix removed without opposition," or "Patient unmanageable; must use anesthetic."
A central or ganglion cell, which receives the sensory impulse, translates it into consciousness, and is the seat of whatever powers of perception, thought, or will the animal possesses. This also gives rise to the efferent or motor impulses, which are conveyed by a motor fibril to the corresponding muscle, exciting its contraction.
It is the same as with the fibril of a nerve, which contracts at the slightest touch of any thing heterogeneous; so every motive fiber of a muscle, yea, the muscle itself, and even the whole body shrinks from the touch of whatever is hard or cold. So also the substances or forms of the spiritual degree in man shrink from evils and their falsities, because these are heterogeneous.
And man has been set in the family relation that this sentiment might be developed. There is no one in whose heart it does not exist. You cannot find me a being so defaced, so alienated from the common stock of humanity, as to cherish in his bosom no secret fount of love, no fibril of affection linking him to something else.
Each fibril when retracted becomes a non-conductor, but when extended and in contact with another fibril, or with the body of another cell, it conducts its message as readily as a continuous filament could do precisely as in the case of an electric wire. This conception, founded on a most tangible anatomical basis, enables us to answer the question as to how ideas are isolated, and also, as Dr.
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