. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. 155 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. torticollis. The dorsal curve may usually with safetybe ignored, as, unless of long standing, it will ordinarilydisappear as soon as the primary condition is removed. Another condition which also bears the name of torti-collis is that of clonic unilateral spasm of one or moreof the muscles of the neck, usually the sterno-cleido-mastoid. It ranks properly among the neuroses, bearingan ana
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. 155 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. torticollis. The dorsal curve may usually with safetybe ignored, as, unless of long standing, it will ordinarilydisappear as soon as the primary condition is removed. Another condition which also bears the name of torti-collis is that of clonic unilateral spasm of one or moreof the muscles of the neck, usually the sterno-cleido-mastoid. It ranks properly among the neuroses, bearingan analogy, in its clinical symptoms at least, to histrionicspasm and writers cramp. It issupposed to be due to an irri-tation of the spinal accessorynerve ; in some cases this nervehas been found to be hyper-trophied. It is a disease moreespecially of adult life, thoughit has been observed tooccur in infants duringdentition, and in olderchildren as a sequela orlingering symptom ofchorea. The head isdrawn to one side androtated in the oppositedirection by a series ofjerks, sometimes ten ortwenty occurring in. Fig. 3950.—The Ball-and-socket Joint,and Chin-piece. (After Shaffer.) Tapid succession, and then being followed by a period ofrest during which the head resumes its normal the disease has existed for a considerable time apermanent distortion may remain, even in the intervalsof spasm. The affection usually, though not always, in-creases in severity with time ; it seldom, if ever, disap-pears spontaneously. There may be pain of a dull, ach-ing character in the muscles of the neck. The spasmsare generally more severe if the health of the patient be-come impaired and if he be laboring under nervous ex-citement, though sometimes a nervous shock or any sud-den emotion may be curative in its effect. The faradicexcitability of the affected muscles is increased, as isalso their electrical sensibility. Cases have been ob-served in which both sterno-mastoid muscles were af
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