Marshall Hall (physiologist)

Marshall Hall (1790 - 1857) was an English physician and physiologist. His name is attached to the theory of reflex arc mediated by the spinal cord, to a method of resuscitation of drowned people, and to the elucidation of function of capillary vessels.

Hall was born on the February 18th 1790, at Basford, near Nottingham, England, where his father, Robert Hall, was a cotton manufacturer. Having attended the Rev. J. Blanchards academy at Nottingham, he entered a chemists shop at Newark, and in 1809 began to study medicine at Edinburgh University. In 1811 he was elected senior president of the Royal Medical Society; the following year he took the M.D. degree, and was immediately appointed resident house physician to the Royal Infirmary, Edinburgh. This appointment he resigned after two years, when he visited Paris and its medical schools, and, on a walking tour, those also of Berlin and Göttingen. In 1817, when he settled at Nottingham, he published his Diagnosis, and in 1818 he wrote the Mimoses, a work on the affections denominated bilious, nervous, &c. The next year he was elected a fellow of the Royal Society of Edinburgh, and in 1825 he became physician to the Nottingham general hospital. In 1826 he removed to London, and in the following year he published his Commentaries on the More Important Diseases of Females.

In 1830 he issued his Observations on Blood-letting Founded on Researches on the Morbid and Curative Effects of Loss of Blood, denouncing the adverse effects of the widespread practice of bloodletting, which was acknowledged by the medical profession to be of vast practical value, and in 1831 his Experimental Essay on the Circulation of the Blood in the Capillary Vessels, in which he was the first to show that the capillaries are intermediate channels between the arteries and the veins and put the blood in contact with biological tissues. In the following year he read before the Royal Society a paper On the Inverse Ratio which Subsists between Respiration and Irritability in the Animal Kingdom.

His most important work in physiology was concerned with the theory of reflex action, embodied in a paper On the Reflex Function of the Medulla Oblongata and the Medulla Spinalis (1832), which was supplemented in 1837 by another On the True Spinal Marrow, and the Excito-motor System of Nerves. In this theory, he stated that the spinal cord is comprised by a chain of units that functions as an independent reflex arcs, and their activity integrates sensory and motor nerves at the segment of the spinal cord from which these nerves originate. He proposed in addition that those arcs are interconnected and interacting in the production of coordinated movement.

The reflex function excited great attention on the continent of Europe, though in England some of his papers were refused publication by the Royal Society. Hall thus became the authority on the multiform deranged states of health referable to an abnormal condition of the nervous system, and he gained a large practice.

In Asphyxia, its Rationale and its Remedy (1856), Hall developed a technique for preventing victims of drowning by freeing their respiratory airway and by providing immediate ventilation, as the initial steps in resuscitation.

He died at Brighton of a throat affection, aggravated by lecturing, on the August 11th, 1857.

In 1831, he outlined five principles to govern animal experimentation.

1. An experiment should never be performed if the necessary information could be obtained by observations
2. No experiment should be performed without a clearly defined and obtainable, objective
3. Scientists should be well-informed about the work of their predecessors and peers in order to avoid unnecessary repetition of an experiment
4. Justifiable experiments should be carried out with the least possible infliction of suffering (often through the use of lower, less sentient animals)
5. Every experiment should be performed under circumstances that would provide the clearest possible results, thereby diminishing the need for repetition of experiments.

External link

• Trauma resuscitation (http://www.trauma.org/history/resuscitation.html).

Source