« ForrigeFortsæt »
half immediately above the issue of the nerves for the limbs, paralyzes the motion of the corresponding limbs of the same side, but not the reaction to irritation. 4. Longitudinal sections through the median line of the spinal marrow do not impair the motion, but increase the reaction, produced by irritation of parts corresponding to the portion of the spinal marrow thus divided. The author infers from these results, "that a crossed action of the spinal marrow does not exist in frogs.” II. In pigeons, section of one lateral half of the spinal marrow, at whatever portion it may be instituted, in no way impairs the voluntary motion of the opposite side of the body, nor the reaction on peripheric irritation; it destroys the voluntary motion of the corresponding side below the place of section, but not the reaction of the same side on irritation, the reaction appears, on the contrary, rather increased. The inference therefore is again, that there is no reason for admitting the view of crossed actions in the spinal marrow of pigeons. III. The experiments on mammalia (rabbits, guinea-pigs, cats, dogs) showed, that section of either lateral half causes paralysis of motion on the corresponding side, below the section, and likewise on the same side increased reaction to irritation; while on the other side of the body neither the voluntary motion por the reaction to irritation are perceptibly changed. Bezuild concludes from this that there does not exist a crossing of the motor conductors in the spinal marrow of mammalia, and that the crossed transmission of sensitive impressions is not proved.
The same author also examined the influence of section of either lateral half of the spinal marrow on the temperature, and found :-1. Constant increase of temperature in the lower part of the leg (or fore-arm), and in the foot of the corresponding side. 2. Constant and considerable decrease of temperature in the lower part of the leg (or fore-arm), and in the foot of the opposite side. These changes began about half an hour after the operation, and increased steadily for some hours to such a degree as sometimes to cause a difference of 15° Cent. (57° Fah.). 3. Decrease of the temperature in general. 4. Constant decrease of temperature (absolute and relative) of the upper part of the arm, of the thigh, and upper part of the leg of the corresponding side. 5. Less considerable diminution in the same parts of the opposite side. 6. Equal diminution on both sides of the thorax, as far as it is covered with the respiratory muscles. Bezold concludes that the vaso-motor nerves of the lower part of the leg and of the foot ascend in the spinal marrow on the same side up to the medulla oblongata; that a crossing of the vaso-mctor nerves for the thigh and upper part of the leg is not proved by the experiments. Finally, the author expresses in the résumé that in none of the classes of animals examined a crossing of the sensitive fibres is proved, nor the converse.
Lister has examined the facts which have induced Ed. Weber, Pflüger, Ludwig, and others to establish the theory of inhibitory nerves. The author's experiments on rabbits corroborate that galvanic irritation of the pneumogastric and splanchnic nerves does produce retardation and quiescence of the movements of the heart and intestines; he thinks hiinself, however, entitled to infer, from the results of many experiments, that only stronger currents have spch an effect, while the mildest currents, "just perceptible to the tip of the tongue,” cause, on the contrary, accelerated contractions of the heart and increased peristaltic movements. With regard to the splanchnic nerve and intestines, Lister sums up as follows: “It appears that the intestines possess an intrinsic ganglionic apparatus which is in all cases essential to the peristaltic movements, and while capable of independent action, is liable to be stimulated or checked by other parts of the nervous system ; the inhibiting influence being apparently due to the energetic operation of the same nerve-fibres which, when working more mildly, produce increase of function.” (1. c. p. 372.) Concerning the connexion between the pneumogastric nerves and the heart, the author's view is, likewise, that these nerves have no claim to be called “inhibitory nerves,” an expression which he considers “ altogether objectionable, since there is good reason to think that the same fibres which check the movements, much more commonly enbance them.” Lister differs, therefore, in his view from Schiff,* who is otherwise a no less energetic opponent to the theory of an “inhibitory system,” and who considers the inhibiting influence as depending on nervous exhaustion. The very rapid recovery of the intestinal and cardiac actions, when the inbibiting galvanic currents are discontinued, appear to our author incompatible with the explanation by "exhaustion.”
We cannot conclude our report on Lister's paper without mentioning that, in repeated experiments, he did not observe increased frequency of the heart's contractions after section of the pneumogastric nerves; a fact which is at variance with the results of other experimenters, of whom we need only mention Nasset and Arnsperger, who found acceleration of the heart's contractions after section of the vagi.
PHüger defends the theory of the inhibitory action of the vagi and splanchnici against Schiff's just-mentioned view, by asserting that even the mildest currents cause retardation or quiescence of the respective organs, and by calling to mind that section of the vagi does not produce diminution of the heart's contractions, bat, on the contrary, increased frequency. The author further describes Schiff's experiment on the thigh, on which this physiologist principally bases his view, and attempts to show that Schiff has misinterpreted the phenomena ; our space, however, compels as to refer for the description to Pflüger's paper, and to Schiff's “Lehrbuch der Physiologie."
* Schiff's Lehrbuch der Physiologie. + Conf. this Journal, No. xxxv. 1856.
# Ibid., No. xxxvii. 1857.
Haber's experiments with curare performed on frogs, under Reichert's superintendence, corroborate Bernard's and Kölliker's inference, that curare paralyzes the terminations of motor nerves ; that the contractions of the muscles, caused by local irritation, after the poisoning by curare, depend on the irritability of the muscular fibres themselves, without the influence of the nerves (see Sub. VI.). The peripheric terminations of the motor nerves first becoine paralyzed, in general within twelve to fifteen minutes ; after five to eight hours the spinal marrow appears paralyzed, while the sensitive nerves in their whole extent, and the trunks of the motor nerves (in opposition to their peripheric termination), retain their irritability for a long period (twenty, thirty-six, or forty-eight hours). The author attributes this difference in the several portions of the nervous system, not to differences in the structure and supply of blood, but to differences in the chemical constitution.
It is well-known that Budge attributes to the part of the spinal marrow situated between the sixth cervical and the third dorsal vertebræ the func ion of a centre for the cervical portion of the sympathetic nerve (centrum cilio-spinale), presiding over the influence of the sympathetic nerve on the movements of the iris anıl the blood vessels of the head (regulation of temperature). The same author establishes a centre for the lumbar portion of the sympathetic nerve (the centrum genito-spinale) situated in rabbits in that part of the spinal marrow which corresponds to the fourth lumbar vertebra. Budge says that the two filaments of the lumbar portion of the sympathetic nerve are found between the two psoas muscles, behind the aorta and vena cava. Cominunicating branches are seen passing from one filament to the other, and in the region of the fifth lumbar vertebra a ganglion is constantly met with, which receives communicating branches from the third and fourth lumbar nerves. Galvanic irritation of this ganglion, and of the filainents below it, causes energetic movements of the ductus deferentes, while irritation above the ganglion does not influence them; it also causes increased movement of the urinary bladder, and of the lower part of the rectum. The portion of the spinal marrow which, when irritated, excites the movements of the ductus deferentes, is limited to a length of about three lines; while the centre for the urinary bladder and rectum appears to be rather less limited. If the sympathetic nerve of one side is cut, irritation of the genito-spinal centre causes energetic movements in the deferent duct of the side on which the nerve is entire; while the movements of the duct of the other side are slight, but not quite absent, on account of the communicating branches between the two nerves. Budge remarks, that these facts, as well as those connected with the cilio-spinal centre, speak against the independence of the sympathetic nervous system.
Wagner had the opportunity of examining the action of the cervical portion of the sympathetic nerve on the eye in the body of a woman who had been beheaded about twenty minutes before the commencement of the experiments. Irritation of the cervical portion of the right sympathetic nerve about 11" below the superior cervical ganglion, by means of a magneto-electric apparatus, caused gradual opening of the lids of the right eye, previously closed; a result which was still obtained forty-five minutes after the decapitation, although then in a less perfect degree. Simultaneous with the opening of the eyelids was the dilatation of the pupil in a very marked manner; an effect which was still obtained, as late as forty-eight minutes after decapitation, when the head was handed over to other experimenters. Wagner adds, that the opening of the eyelids did not depend on the action of the levator palpebræ superioris, as it had quite the character of the action of organic muscular fibres-i.e., the muscular action followed the commencement of the irritation only after some minutes, and continued for some time after the cessation of the irritation.
Eckhard found that the saliva secreted under the influence of irritation of the sympathetic nerve, is different from the fluid obtained through irritation of the glandular branch of the fifth pair. The former is less clear and transparent, and, above all
, more thick and viscid than the latter. A more accurate description the author promises on a future occasion.
PHüger uses the following plan for showing the axis-cylinder. He removes the nearilemma by means of a pin, and spreads out the fibres on the glass slide, without at first adding any fluid. Afterwards he adds a drop of collodion, and covers the whole with a thin glass. Everywhere, the author says, the most distinct axis-cylinders immediately appear.
KLAATSOH and Stion: On the Seat of Gustatice Sensation. (Virchow's Archiv, vol. xiv., p.
The greater portion of Klaatsch's and Stich's paper is historical. Their own experiments were made with extract of quassia, solutions of sugar, salt, and tartaric acid. These substances were applied by means of a very thin camel's hair brush, while the eyes of the person operated upon were tied. The authors infer: “A narrow border round the margin of the tongus, varying from two to four lines ir breadth, is subservient to taste: in most persons it lies in the middle of the margin ; in some it approaches the upper surface, in very few, it appears, the lower surface. The root and the posterior third of the tongue, as well as a part of the soft palate, are also subservient to taste. Other parts of the mouth or fauces, or of other organs, are not instrumental in this sense.” (l. c., pp. 237, 8.)
VI. ORGANS OF LOCOMOTION.
1. HABER: On the Action of Curare on the Cerebro-Spinal Nervous System. (Achiv f. Anat.
und Physiol., Jahrgang 1859, p. 98.) 2. Von Wittich: On Peculiar Muscular Contraction caused by the flowing of Water through
the Vascular System. (Virchow's Archiv, vol. xiii., p. 421, 1858.) )
Haber bases the view that the contractions of the muscular fibres observed after poisoning by curare (see Sub. V.) are independent of the motor nerves, especially on the character of the muscular contractions, and on the manner of termination of the motor nerves in the tissue of the muscles, as elucidated by Reichert.* This author found that the single fibres of the nerves are spread over a comparatively large space, thus comprising several muscular fibrillæ. “The whole peripheric distribution of the motor nerve-fibres," he reasons, “ the frequent ramifications of the fibres entering the muscle, manifest the principle to bring each nerve-fibre in contact with as many muscular fibres as possible.” From this distribution Reichert inferred, that the irritation, originated by a single nerve-fibre, is not restricted to a limited number of muscular fibres, but acts on the whole muscle, or at least a great portion of it. Experiments show that the local irritation of a muscle of an animal recently killed, causes contraction of a considerable number of muscular fibres; while, on the contrary, each local irritation in animals poisoned by curare, causes only a very restricted contraction of fibres, in fact, only the fibres actually irritated, the other art of the muscle remaining perfectly motionless. It a'pears from this that the independent irritability of the muscular fibres is at last firmly established.
Wittich studied the nature of the convulsions produced, as E. Weber and Liebig already had observed, by injection of water through the aorta of animals soon after their death. By causing a stream of water to pass through the aorta of frogs, convulsions are occasioner, first in the muscles of the head and neck, then in those of the arms and abdomen, and at last when the blood is altogether expelled through the veins, also in the pos:erior limts. Distilled water caused, of all fluids tried, the most powerful and long-continued convulsions; spring and river-water less so; serum and saline solutions bad scarcely any effect. Destruction of the nervous centres and section of the nerves had no influence on the appearance of the convulsions. Frogs poisoned by brucine and curare exhibited, when distilled water was injected, powerful convulsions, while galvanic irritation of the nerves had ceased to excite the muscles. Wittich further convinced himself that distilled water alone, when applied on a frog's muscle deprived of skin, causes contractions. The author infers that pure water alone, without the influence of the nerves, causes the phenomena in question, and that water is a powertul excitarit for the muscles, while it appears to be an indifferent agent with regard to the nervés. The endosmotic interchanges between the tissue of the muscle and the distilled water offer the probable explanation.
SEXUAL ORGANS; GENERATION. BERNARD: On a Nero Function of the Placenta. (Brown-Séquard's Journal, vol. ii., p. 30,
Bernard arrived at the following inferences:-1. There exists in the placenta of mammalia * C. B. Reichert: Ueber das Verhalten der Nervenfasern bei dem Verlauf, der Vertheilung und Endigung in einem Hautmuskel des Frosches. (Archiv f. Anat. und Phys., Jahrgang 1851, p. 68.)
a function, hitherto unknown, which coincides with the absence of the glycogenic function of the liver during the first period of the embryonic life. This function is localized in a transitory glandular or epithelial element of the placenta, which in some cases of animals is mixed with the vascular portion of that organ, but which in the ruminantia presents itself in a separated shape, so as to form on the amnios spots of epithelial appearance, the glycogenic nature of which has hitherto been unknown. 2. This temporary hepatic organ of the placenta, which permits the study of the formation of the glycogenic substance in an isolated anatomic element, confirms the author's view that the formation of amylaceous matter is al faculty common to the animal and vegetable kingilom. 3. The glycogenic function begins in animals with the commencement of their fætal existence, and before the organ, in which this function is localized in the adult, is developed. The author further proposes the following question-whether the same glandular cells are charged with the double function of producing the glycogenic substance and of furming bile, or whether the liver is to be considered as a compound organ, in which are found mixed two isolated anatomic elements--the one destined to form glycogenic substance, the other to form bile. Berpard thinks that this question may now be decided by researches on the embryonic development and on lower animals. He has himself commenced such researches, and promises to communicate the result.
HALF-YEARLY REPORT ON MATERIA MEDICA AND THERAPEUTICS.
By ROBERT HUNTER SEMPLE, M.D.
I. On the employment of Tannin in large doses in Albuminous Anasarca. By Dr. P. Gar
NIER. (Archieves Gé.iérales de Médicine, January, 1859. ALTHOUGH the internal use of tannic acid is still very limited in France, its employment in large doses has been much recommended lately in other countries, and has been exiended to numerous cases which, while proving its innoxious character, appear to exhibit it as possessing some totally new properties. It has been shown to be useful in all cases where it is required to arrest bæmorrbages, to give tone to organism, or to remedy morbid secretions. It has been employed, for example with great benefit, in albuminuria, diabetes, and serous infiltrations,
From these considerations, Dr. Garnier has been induced to employ tannic acid in the albuminous anasarca consecutive to scarlatina; and he adduces several cases illustrative of this mode of treatinent, drawn from his own experience and cases recorded by other physicians. The cases all prove that in the general serous infiltration of the tissues complicated with albuminous urine, there is a rapid and simultaneous disappearance of these two morbid phenomena under the influence of tannin alone, administered in a large dose. The conclusions drawn by Dr. Garnier are that tannin, employed in doses of two to four grains a day ( 3 ss to 3j), cures anasarca or ædema developed passively and occurring simultaneously with albuminous urine; that its curative action is manifested by abundant urine, gradually resuming its physiological characters, by perspiration, easy alvine evacuations, return of appetite, &c.; that these signs appear from the second day of the administration of the tannin; that given in solution in doses of twenty to fifty centigrammes at a time, tannin causes no unfavourable syroptoms affecting the digestive passages; and lastly, that the action of tannin appears to be exerted primarily upon the fluids of the economy, the albuminous principles of which it coagulates and renders plastic, and that its consecutive action on the solids appears to be tonic and astringent.
II. On the Employment of Veratria in Acute Diseases of the Chest. (Bulletin Général de
Thérapeutique, Jan. 30th, 1859.) M. Aran has called the attention of practitioners to the remarkable effects produced by the interval use of veratria in febrile diseases, and especially pneumonia. In the ‘Sardinian Medical Gazette' an article has appeared, in which Dr. Ghiglia, without any knowledge of M. Aran's researches, recommends the use of veratria in the same circumstances, except that he never employs this alkaloid alone, but associates it almost always with opium, sometimes in
the form of pill, sometimes as a syrap. The dose of veratria is five millegrammes ('077 of a Troy grain) in a pill with the same quantity of opium, and the namber of pills to be taken in the twenty-four hours varies from six to seven, and even twelve, according to the circum
In this dose, according to M. Ghiglia, vomiting rarely occars, but nausea and the other depressing effects of veratria are present. The results obtained by M. Ghiglia in certain cases of pneumonia, bronchitis, and broncho-pneumonia have been sometimes most reinarkable, but have been occasionally unfavourable, and the following are the results arrived at by this author: “1. The inflammation of the respiratory organs, when they have arrived at such a period as to produce disorganization of the parts, are not improved by the use of veratria. 2. The action of this substance is the more favourable in proportion as the disease is more recent. 3. The tolerance is very various, according to individual habits, and perhaps also according to certain peculiarities which are not yet well understood. 4. The more easily the tolerance ceases the more marked is the depression. 5. Veratria is in many respects a preferable medicine to others which are more constant in their action but less easy to take. And 6. It is perhaps prudent, in severe inflammations of the respiratory organs, to order a few bleedings before prescribing the veratria.
III. On the Poisonous Properties of the Ethereal Oil of Elemi. By Dr. EMIL MANNKOPFF.
(Virchow’s Archiv für pathologische Anatomie und Physiologie und für Klinische Medicin, No. 15, 1859.) The ethereal oil of elemi is obtained from the resin of elemi, brought from Brazil and Yucatan. It is found in the resin in very variable proportions, but on the average it may be considered to exist in the quantity of about six per cent. The oil is transparent, almost colourless, having a smell which is not unpleasant, and a somewhat acrid and bitter taste. It is insoluble in water, but is easily dissolveil in alcohol or ether. According to Stenhouse and Deville, the analysis of the oil of elemi gave the formula of 5C 8H.
Dr. Maonkopff made a series of experiments on rabbits and frogs, with a view of ascertaining the operation of this oil upon the animal economy. In the case of the rabbits, the oil was injected into the stomach by means of an elastic catheter; in frogs the same operation was partially resorted to, but in some the oil was injected under the skin of the back. In a few cases the oil was applied locally on particular parts of the frogs.
The conclusions drawn by Dr. Mannkopff as to the operation of the oil of elemi on animals are the following: namely, that when applied to the intestinal tract, it produces hæmorrhagic erosions and numerous functional disturbances in the stomach; and in the intestines, increased peristaltic action and sensation of pain, succeeded by paralysis and anæsthesia. The oil acts in a similar manner wberever it is applied directly. After absorption it paralyses the sensitive portion of the nervous system and the nervus vagus. Hence arise, 1. Acceleration and increased strength of the movements of the heart, and consequently increased diuresis, which is connected with an inflammation of the kidneys to a greater or less extent, and perhaps of the bladder, produced by a specific irritation of the poison; and there is afterwards a sensation of thirst. 2. The diminution and gradual suppression of the respiration occasioned by atelectasis and emptying of the lungs, and diminution of temperature, with which deficient nutrition is associated as a canse. In the second place, when paralysis of the heart is at last produced, death ensues, probably due to the abolition of the functions of the brain.
In concluding his paper, Dr. Mannkopff introduces the question as to the use wbich may be made of the ethereal oil of elemi as an internal remedy. In this point of view three circumstances ought to be taken into consideration. 1. The increase of the heart's contractions, 2. The increase of diuresis. 3. The anesthetic effects on the sensitive nerves. The oil might probably be given in the cases in which oil of turpentine is found useful, for both oils coincide very much in their medicinal properties. Perhaps the oil of elerni might be preferable from its less uppleasant taste. The question may be asked whether the oil of elemi might not cause inflammation of the kidneys when given in a sufficient dose; but this point can only be determined by experiments on the living subject. Still, since oil of turpentine produces a decided effect in neuralgia, as is proved by the operation of this oil on the sensitive nerves, Dr. Mannkopff believes that experiments with oil of elemi in similar cases would be completely justified.
IV. Process for Ascertaining the Proportion of Quinine in Cinchona Bark. (Bulletin Gé
néral de Thérapeutique, Oct. 30th, 1858.) This process, published by, M. Guillermond in the 'Gazette Médicale' of Lyons, is a modi