The Anatomy and Physiology of the Human Body, المجلد 2

الغلاف الأمامي
Longmans, Rees, Orme, Brown, and Green, 1829 - 508 من الصفحات
 

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مقاطع مشهورة

الصفحة 363 - After delaying long, on account of the unpleasant nature of the operation, I opened the spinal canal of a rabbit, and cut the posterior roots of the nerves of the lower extremity ; the creature crawled, but I was deterred from repeating the experiment by the protracted cruelty of the dissection. I reflected, that an experiment would be satisfactory, if done on an animal recently knocked down and insensible...
الصفحة 390 - Thus we find, that the bones of the head are moulded to the brain, and the peculiar shapes of the bones of the head, are determined by the original peculiarity in the shape of the brain.
الصفحة 545 - We can readily conceive why a man stands with eyes intently fixed on the object of his fears, the eyebrows elevated to the utmost, and the eye largely uncovered ; or why, with hesitating and bewildered steps, his eyes are rapidly and wildly in search of something. In this, we only perceive the intent application of his mind to the object of his apprehensions — its direct influence on the outward organ.
الصفحة 381 - whatever we observe on one side has a corresponding part on the other ; and an exact resemblance and symmetry* is preserved in all the lateral divisions of the brain. And so, if we take the proof of anatomy, we must admit that, as the nerves are double, and the organs of sense double, so is the brain double, and every sensation conveyed to the brain is conveyed to the two lateral parts, and the operations performed must be done in both lateral portions at the same moment.
الصفحة 81 - Servetus possessed of the way by which the blood passed from the right to the left side of the heart was in advance of his time, and a step beyond that reached by Galen.
الصفحة 355 - If we select the filament of a nerve, and if its office be to convey sensation, that power shall belong to it in all its course wherever it can be traced ; and wherever in the whole course of that filament, whether it be in the foot, leg, thigh, spine, or brain, it may be bruised, or pricked, or injured in any way, sensation and not motion will result; and perception arising from the impression will be referred to that part of the skin when the remote extremity of the filament is distributed.
الصفحة 356 - ... together. At the root of the axillary nerve we should trace it into the composition of a fascis, where it forms the anterior root of a spinal nerve. Being further traced, it would merge in the anterior column of the spinal marrow ; and traced into the base of the brain, it might be followed as a tractus, a streak of matter distinguishable from the surrounding substance, until it was seen to disperse and lose itself in the cineritious matter of the cerebrum. In all this extent, however combined...
الصفحة 381 - ... these he designates as his organs. Has he erred, or is nature inconsistent?" or, it may be added, is Dr. Smith in ignorance and error? Were we disposed to adopt the professor's mode of procedure, we should say that, according to Sir Charles Bell, " Whatever we observe on one side of the brain, has a corresponding part on the other ; and an exact resemblance and symmetry is preserved in all the lateral discoveries.
الصفحة 369 - Again, he exposed the anterior branch of the fifth pair at its root, in an ass, the moment the animal was killed ; and, on irritating the nerve, the muscles of the jaw acted, and the jaw was closed with a snap. On dividing the root of the nerve in a living animal, the jaw fell relaxed.
الصفحة 384 - But surely physiologists have been mistaken in supposing it necessary to prove sensibility in those parts of the brain which they are to suppose the seat of the intellectual operations. We are not to expect the same phenomena to result from the cutting or tearing of the brain as from the injury to the nerves. The function of the one is to transmit sensation ; the other has a higher operation. The nature of the organs of sense is different; the sensibilities of the parts of the body are very various....

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