File:Practical diagnosis- the use of symptoms in the diagnosis of disease (1899) (14762180561).jpg

Identifier: practicaldiagno00hare (find matches)
Title: Practical diagnosis: the use of symptoms in the diagnosis of disease
Year: 1899 (1890s)
Authors: Hare, H. A. (Hobart Amory), 1862-1931
Subjects: Diagnosis
Publisher: Philadelphia and New York, Lea brothers & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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the nuclei of the third and sixth cranial nerves are closelyconnected, so that a lesion involving the sixth nucleus weakens thenucleus of the third nerve. (Fig. 84.) Complete paralysis of theexternus may, therefore, be due to a nuclear lesion; for if the lesion THE EYE. 179 were above the nucleus, this nucleus might obtain collateral impulses,as seen in this diagram, and, therefore, the paralysis would be onlypartial. It may also be due to a peripheral lesion. Sometimes,however, an inflammatory process pressing upon the basilar surfaceof the sphenoid, and thereby involving the nerve, may cause asimilar effect. Loss of power of the external rectus may also arisefrom neurasthenia, uric-acid diathesis, gout and rheumatism, and intubercular or syphilitic meningitis at the base, as already stated. Italso comes on in some cases of diabetes, la grippe, and in chronicpoisoning by lead and alcohol, or the acute poisoning of gelsemium,ptomaine-poisoning, conium- and spigelia-poisoning. Fig. 84.
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Cochlea SemicircularCanalsDiagram of the connections of the nucleus of the sixth nerve. (Bruce.) Again, let us suppose that the internal rectus is paralyzed, caus-ing external squint. We remember that it is supplied by the oculo-motor nerve, which arises from a nucleus in front of the corporaquadrigemina, which extends from the level of the posterior com-missure to a point near the nucleus of the fourth nerve or patheticus.(Fig. 83.) Landois states that the two nuclei (the third and fourth)are united. The nucleus of the oculomotor nerve has been dividedinto several groups, as shown in Fig. 85, after Bruce, where, how- 180 THE MANIFESTATION OF DISEASE IN ORGANS. ever, it is seen that the third and fourth nuclei are not united. Thenerve itself pierces the dura mater below the posterior clinoid pro-cess, passes along the outer wall of the cavernous sinus, and afterdividing into two branches enters the orbit through the sphenoidalfissure. The upper branch supplies the superior rectus and

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