Spinal cord
The spinal cord is a long, thin, tubular bundle of nervous tissue and support cells that extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column. The brain and spinal cord together make up the central nervous system (CNS).
Quotes
- "One moment, if he asks for something to drink, give him this," said the house student, pointing to a large white jar. "If he begins to groan, and the belly feels hot and hard to the touch, you know what to do; get Christophe to help you. If he should happen to grow much excited, and begin to talk a good deal and even to ramble in his talk, do not be alarmed. It would not be a bad symptom. But send Christophe to the Hospice Cochin. Our doctor, my chum, or I will come and apply moxas. We had a great consultation this morning while you were asleep. A surgeon, a pupil of Gall's came, and our house surgeon, and the head physician from the Hotel-Dieu. Those gentlemen considered that the symptoms were very unusual and interesting; the case must be carefully watched, for it throws a light on several obscure and rather important scientific problems. One of the authorities says that if there is more pressure of serum on one or other portion of the brain, it should affect his mental capacities in such and such directions. So if he should talk, notice very carefully what kind of ideas his mind seems to run on; whether memory, or penetration, or the reasoning faculties are exercised; whether sentiments or practical questions fill his thoughts; whether he makes forecasts or dwells on the past; in fact; you must be prepared to give an accurate report of him. It is quite likely that the extravasation fills the whole brain, in which case he will die in the imbecile state in which he is lying now. You cannot tell anything about these mysterious nervous diseases. Suppose the crash came here," said Bianchon, touching the back of the head, "very strange things have been known to happen; the brain sometimes partially recovers, and death is delayed. Or the congested matter may pass out of the brain altogether through channels which can only be determined by a post-mortem examination. There is an old man at the Hospital for Incurables, an imbecile patient, in his case the effusion has followed the direction of the spinal cord; he suffers horrid agonies, but he lives."
- Honoré de Balzac, Le Père Goriot (1835)
- The distinguished scientist Herr Professor Luitpold Blumenduft tendered medical evidence to the effect that the instantaneous fracture of the cervical vertebrae and consequent scission of the spinal cord would, according to the best approved tradition of medical science, be calculated to inevitably produce in the human subject a violent ganglionic stimulus of the nerve centres of the genital apparatus, thereby causing the elastic pores of the corpora cavernosa to rapidly dilate in such a way as to instantaneously facilitate the flow of blood to that part of the human anatomy known as the penis or male organ resulting in the phenomenon which has been denominated by the faculty a morbid upwards and outwards philoprogenitive erection in articulo mortis per diminutionem capitis.
- James Joyce, Ulysses (1922)
- The frog instantly dies when the spinal cord is pierced; and before this it lived without head, without heart or any bones or intestines or skin, and here therefore it would seem lies the foundation of movement and life. All the nerves of the animals derive from here: when this is pricked they instantly die.
- Leonardo da Vinci, The Notebooks
- Apply this spinal branch of phrenology to the Sperm Whale. His cranial cavity is continuous with the first neckvertebra; and in that vertebra the bottom of the spinal canal will measure ten inches across, being eight in height, and of a triangular figure with the base downwards. As it passes through the remaining vertebrae the canal tapers in size, but for a considerable distance remains of large capacity. Now, of course, this canal is filled with much the same strangely fibrous substance—the spinal cord—as the brain; and directly communicates with the brain. And what is still more, for many feet after emerging from the brain’s cavity, the spinal cord remains of an undecreasing girth, almost equal to that of the brain. Under all these circumstances, would it be unreasonable to survey and map out the whale’s spine phrenologically? For, viewed in this light, the wonderful comparative smallness of his brain proper is more than compensated by the wonderful comparative magnitude of his spinal cord.
- Herman Melville, Moby-Dick (1851)
- The will, as the thing-in-itself, constitutes the inner, true, and indestructible nature of man; yet in itself it is without consciousness. For consciousness is conditioned by the intellect, and the intellect is a mere accident of our being, for it is a function of the brain. The brain, together with the nerves and spinal cord attached to it, is a mere fruit, a product, in fact a parasite, of the rest of the organism, in so far as it is not directly geared to the organism's inner working, but serves the purpose of self-preservation by regulating its relations with the external world. On the other hand, the organism itself is the visibility, the objectivity, of the individual will, its image, as this image presents itself in that very brain (which in the first book we learned to recognize as the condition of the objective world in general).
- Arthur Schopenhauer, The World as Will and Representation (1819; 1844; 1859), Ch. 19 : On the Primacy of the Will in Self-Consciousness
- The brain contains an exact configuration of about ten billion neurons, or cellular units, each of which makes hundreds or even thousands of contacts with other neurons. Vast numbers of nerve fibers pass down from the brain through the spinal cord, where they connect with still other nerves that relay information and instructions back and forth to the remaining organs of the body. The central nervous system, comprising the brain and spinal cord in tandem, receives electrical signals from no fewer than a billion sensory elements, from the visual rods of the retina to the pressure-sensitive corpuscles of the skin.
- Edward O. Wilson, On Human Nature (Revised edition, 2004), Ch. 3 : Development
