File:The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment (1913) (14750147536).jpg

Identifier: practiceofmedici00tyso (find matches)
Title: The practice of medicine; a text-book for practitioners and students, with special reference to diagnosis and treatment
Year: 1913 (1910s)
Authors: Tyson, James, 1841-1919
Subjects:
Publisher: Philadelphia : P. Blakiston's
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
to account for.It is more frequent in men, and sometimes heredity or family tendency is PROGRESSIVE BULBAR PALSY 933 noted. It has been ascribed to the overuse of the muscles of the mouth,as in the blowing of wind-instruments; to a tumor in the medulla oblongataor vicinity; while syphilis, to which so many of the unaccountable lesions ofthe nervous system are ascribed, is less commonly held responsible forthis affection than for some others. Cold, emotional excitement, andextreme fatigue have all been named as causes. Most frequently, however,no cause is traceable. Morbid Anatomy.—Most writers concede that the lesion starts in themotor nuclei of the medulla oblongata. It may be that the entire motorapparatus from the muscular fiber to the ganglionic cell is invaded simulta-neously. Certain it is that bulbar paralysis is often associated both withprogressive spinal muscular atrophy and amyotrophic lateral sclerosis,the symptoms now of one and now of the other preceding. There can be
Text Appearing After Image:
Fig. 157.—Situation of the Granial Nerves—(after Edinger).Cranial nerve nuclei, oblongata, and pons represented as transparent. Motor nuclei, black;sensitive nuclei, red. no doubt that these three conditions are closely allied. The nature of thelesion is the same in each, the motor cells in each are involved, the musclesare wasted in each, though the particular ones involved vary as the situationof the motor cells is different. The anatomical lesion is an atrophy of the motor cells of the medullaoblongata. The nucleus of the hypoglossus, the nucleus of the pneumo-gastric, to a less degree that of the facial and that of the glossopharyngealare all involved, while the sensory nuclei are intact. Very rarely the nucleiof the ocular nerves, third, fourth, and sixth, are involved. From thesenuclei the degeneration extends to the nerves which have their origin inthem, and thence to the muscles to which they are distributed. The nature of the degeneration is a more or less complete destru

Note About Images