File:Journal of anatomy (1867) (14597930099).jpg

Identifier: journalofanatomy51anatuoft (find matches)
Title: Journal of anatomy
Year: 1867 (1860s)
Authors: Anatomical Society of Great Britain and Ireland Anatomical Society of Great Britain and Ireland. Proceedings
Subjects: Anatomy
Publisher: Cambridge (Eng., etc.) University Press
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ed an excellent exampleassociated with paralysis of the external rectus.Romberg (114) described a case of intermittent neuralgia due toirritation of the gasserian ganglion by a rigid dilated internal The Arteries of the Pons and Medulla Oblongata 269 carotid artery. Basilar aneurysm, especially the saccular type,may exert pressure on this nerve proximal to the ganglion.6. Abducent nerve.—Ueierence has previously been made to affectionof this nerve during its passage through the cavernous sinus,and many examples are to be found in the literature. But itspossible compression against the basi-sphenoid appears to havebeen completely neglected. My examinations (see fig. 24) haveshown that the nerve is in relation to this bone for fully halfan inch, as it passes from its superficial origin to the cavernoussinus, and that the anterior inferior cerebellar artery is dorsalto the nerve (i.e. may compress the nerve against the boneunder certain conditions) in 14 per cent, on the right side and
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Fig. 24.—Tu show possible compressiou of sixth nerve by anteriorinferior cerebellar artery. 19 per cent, on the left. It is easy to see that an atheromatousvessel in this percentage might easily produce convergentstrabismus, and very deep grooving of the nerve from thatcause has been seen once in this investigation: and it is im-portant to note that in this case the artery was in the ventralposition, and had no resistant structure to compress the arteryagainst. Space does not permit further discussion of^thispoint, but it ofiers a feasible explanation of uncomplicated sixth-nerve paralysis, which has been unscientifically attributed toits long course and exposed position.Some years ago I saw a case which now appears to be probably anIllustration, as the patient suffered from chronic nephritis andarterio-sclerosis in addition to the transient paralysis of theexternal rectus of one side, which at the time of examinationdefied explanation. There was no suspicion of syphilis, and 270 Dr

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