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Updated: June 2, 2025
He never had been met in that way before, and was not inclined to leave the field without in some way convincing Jim of his own superiority. "Mr. Fenton," said he, "did you ever see a medulla oblongata?" "Well, I seen a good many garters," replied the woodsman, 'in the stores, an' I guess they was mostly oblong." "Did you ever see a solar plexus?" inquired the Doctor, severely. "Dozens of 'em.
If, it would seem, the cortex secretion now pours into the blood, enough to more than overcome the effects of the medulla secretion, the inter-muscular equilibrium is disturbed in the opposite direction, for fight rather than flight, and anger results.
Thus, in an organism such as ours, a considerable number of motor mechanisms are set up in the medulla and in the spinal cord, awaiting only a signal to release the corresponding act: the will is employed, in some cases, in setting up the mechanism itself, and in the others in choosing the mechanisms to be released, the manner of combining them and the moment of releasing them.
The experiments of Brown-Sequard have shown the problem to be a complex one, and raised almost as many doubts as they have solved questions; at any rate, I believe all lecturers on physiology agree that there is no part of their task they dread so much as the analysis of the evidence relating to the special offices of the different portions of the medulla spinalis.
Just at the top of the spinal cord, where it passes into the skull and joins with the brain, it swells out into a sort of knob, about the size of a queen olive or the head of a gold-headed cane, which is known as the medulla, or "pith."
The exact amount of it present in the medulla, in the blood issuing from the adrenals and in the circulation in general have been determined. The concentration in the blood is about one part in twenty million, while there is about a hundred thousand times as much stored in the gland as reserve.
“In a case where the substance of the medulla was lacerated in the neck, there was a paralysis in all the parts below the laceration, the lining of the œsophagus was so sensible, that solids could not be swallowed, on account of the pain they occasioned .
These centres are the central offices where the information is received and from which orders are issued, so to speak. The chief respiratory centre the centre is situated in that portion of the brain just above the spinal cord, in its continuation, in fact, and is known as the medulla oblongata, or bulb.
If, instead of cutting the spinal cord, we separate the medulla oblongata from the pons, an immediate rise of temperature occurs, and continues until death, whether the operation be performed in a cold or heated room. Cutting the medulla at its junction with the pons causes, then, an immediate and direct elevation of temperature, without disturbance of the circulation. What can this mean?
Its effects are due chiefly to depression of the central nervous system, the medulla being the last part of the nervous system to be attacked. Method of Extraction from the Stomach. By distillation in strongly alkaline solutions, when it may be obtained as chloroform and tested as such. Treatment. Stomach-tube or emetic. Hypodermic injections of strychnine.
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