Applied anatomy and kinesiology : the mechanism of muscular movement / by Wilbur Pardon Bowen.

  • Bowen, Wilbur Pardon, 1864-1928
Date:
[1919]
Catalogue details

Licence: Public Domain Mark

Credit: Applied anatomy and kinesiology : the mechanism of muscular movement / by Wilbur Pardon Bowen. Source: Wellcome Collection.

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    which penetrate the gray portions of the cord and terminate among the cells and dendrites there (Fig. 24). The ends of these sensory fibers are often brnsh-like, and. they often intertwine with similar brush-like endings of the dendrites of the motor neurones, thus forming what is called a synapse, or point of communication between one neurone and another. Everyone knows how a light touch upon the hand of a person who is asleep may cause the hand to be moved without awaking the sleeper and without his being aware of it. Such movements, commonly called “reflexes” because the influence of the touch upon the skin seems to be “reflected” back from the central nervous -SC _s a m vv mw Fig. 24.—A sensory neurone and its branches in the cord. (Kolliker.) system to the region from which it originated, can be explained only through a knowledge of the nervous mechanism we are just considering. The contact or pressure upon the skin stimulates one or more of the delicate sensory nerve endings in it and as a result a message or “impulse” passes up the corresponding nerve fibers to the spinal ganglion, thence to the spinal cord, up and down the vertical branches of the sensory axone, and along the horizontal branches to the synapses at their ends. 1 he close intertwining of the sensory brush endings with the similar endings of the motor dendrites here makes it possible for the message to pass to the motor neurone, and once started upon the motor path it can onl\
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