Structure and functions of the brain and spinal cord.

  • Horsley, Victor.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Structure and functions of the brain and spinal cord. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    LECTUHE y. You will now have grasped the salient fact that the spinal cord throughout the vertebrata acts as a conductor of impulses to the brain, which we call sensory, or, better, afferent; and also from the brain, these being commonly termed motor, more properly ejferent; while in addition the gTey matter of the spinal cord acts as a centre for the discharge of simple functions, such as movement, &c. I now have to go further, and to point out to you that besides this system of ganglionic centres and nerve fibres, there are additional o-anoiia in connection with the nerves that enter and leave the spinal cord. The first and most obvious of these is the ganglion which is seated on the posterior root of each spinal nerve, and which I showed you in the last lecture (Fig. 26). The second is a system of ganglia w^hich are united together apparently by a chain of fibres linking them in exactly the same way as the ganglia in the crayfish are connected (Figs. 23, 28), These form what is called the S3niipathetic system or