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Image from page 191 of “Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine” (1901)

Image from page 191 of “Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine” (1901)
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Identifier: textbookofnervou1901dana
Title: Text-book of nervous diseases; being a compendium for the use of students and practitioners of medicine
Year: 1901 (1900s)
Authors: Dana, Charles Loomis, 1852-1935
Subjects: Nervous system
Publisher: New York, W. Wood and Company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Text Appearing Before Image:
the vertical lines.) subacute or chronic. Congestion, exudation, small hemorrhages,and collections of leucocytes occur. The Bheath of the nerve justback of the globe is often distended with a Berous exudate. Aftera time the nerve fibres atrophy, connective tissue proliferate takes their place, and we have a secondary optic atrophy. 166 DISEASES OF THE NERVOUS SYSTEM. The process is essentially peripheral, but it extends back withlessening intensity into the trunk of the nerve. The purely me-chanical theory of neuritis, that it is due to compression, cannotbe accepted in the light of modern pathology. It is probable thatthe neuritis results from an irritating serous fluid which extendsdown the sheath of the nerve, this sheath being a prolongationof the arachnoid cavity. Mechanical causes lead to constriction,accumulation of the fluid, and compression of the nerve at itsperiphery, and hence to inflammation. Sometimes, at least, theirritating fluid contains microbes or microbic poisons.

Text Appearing After Image:
Fig. 87.—Neuro-retinitis (Jaeger). ^Retrobulbar Neuritis.—In this disease the lesion lies chieflybehind the globe. Its causes are especially toxaemia from alcoholand tobacco. It is also due to rheumatic influences, syphilis, lead,and diabetes. In the acute cases there is usually rather rapid loss of sight,with some pain and tenderness. The ophthalmoscopic changes arerelatively slight. In chronic cases, which are usually toxic in originand due to alcohol or tobacco, or oftenest to both, there are colorscotomata or absolute scotomata and amblyopia. There is no pain.The condition is known as tobacco or alcoholic amblyopia. The prognosis of neuritis varies with the cause. If this is re-movable, as in the toxaemias, recovery is the rule. This is a proofthat in neuritis the connective tissue is the part chiefly involved, SENSORY NEUROSES OF THE CEREBRO-SPINAL NERVES. 16? for a destroyed or atrophied optic nerve does not recover. In manycases, however, atrophy follows the neuritis. The t

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