MYDRIATIC 



826 



MYELOHYPH^E 



Mydriatic (mid-re-at'-ik) \_fiv6piaaiq, dilatation of the 

 pupil]. I. Causing mydriasis, or paralysis of the 

 ciliary muscle. 2. A medicine or agent that causes 

 mydriasis, or dilatation of the pupil. 



Myectopy (mi-ek'-to-pe) \_fivq , muscle ; earoiroq, dis- 

 placed]. The abnormal placement of a muscle. 



Myedema (mi-e-de'-mah). Synonym of Myoide ma. 



Myel (mi' -el) \jiveAoq, marrow]. The spinal cord. 



Myelalgia [nti-el-al'-je-ah) [fiveMq, marrow ; aAyoq, 

 pain]. Any pain in the spinal cord. 



Myelalgic (mi-el-al'-Jik) [/iveAoq, marrow ; a/iyoq, 

 pain]. Pertaining to or characterized by myelalgia. 



Myelanalosis (mi-el-an-al-o' -sis) [fiveAoq , marrow ; 

 avd'Auatq , wasting] . Same as Myelatrophy ; tabes 

 dorsalis. 



Myelapoplexy (tni-el-ap 1 '-o-pleks-e) \_p.veAoq, myelon ; 

 dironAr/fta, a stupor]. Hemorrhage into the spinal 

 cord. 



Myelasthenia (mi-el-as-tke' '-ne-ah) \_p,veAoq, myelon ; 

 duBevE/a, weakness]. Spinal neurasthenia. 



Myelatelia (mi- el- at- e'- le-ah) [fiveAoq, myelon; a 

 priv. ; reAoq, completion]. Imperfect development 

 of spinal marrow or of bone-marrow. 



Myelatrophia, Myelatrophy (mi-el-at-ro' '-fe-ah, mi-el- 

 at'-ro-fe) \jive.'k6q, marrow ; arpocpia, wasting]. Any 

 wasting or atrophy of the spinal cord due to spinal 

 disease. 



Myelauxe (mi-el-awks'-e) \jiveAog, marrow ; av^rj, in- 

 crease]. Morbid enlargement of the myel. 



Myelaxis (mi-el-aks'-is) [/iveXog, myelon ; axis, axis]! 

 The neural, or cerebro-spinal, axis. 



Myelemia (?ni-el-e' -me-ah). Synonym of Myelogenic 

 Leukemia. 



Myelencephal (ini-el-en-sef 1 '-al). Same as Afyelen- 

 cephalon. 



Myelencephalic (mi-el-en-sef-al' -ik) [/ivelSg, myelon ; 

 kyuetyaAog, brain]. Relating to the myelencephalon. 



Myelencephalon (mi-el-en-sef ' -al-on) . I. The cerebro- 

 spinal axis. 2. See Metencephalon. 



Myeleterosis (mi- el- et -er -o'- sis) \jiveA6q, marrow; 

 erepuacg, alteration]. Any morbid alteration of the 

 spinal cord. 



Myelic (mi-el' -ik) \jiveK6q, marrow]. Pertaining to the 

 myel. 



Myelin (mi'-el-in) [piveAdg, marrow], C +0 H 75 NPO 10 . 

 A name given by Thudichum to a substance obtained 

 from the white matter of the brain. It occurs usually 

 as a white, amorphous, ivory-like mass, but crystallizes 

 from an ethereal or alcoholic solution. In a wider 

 sense, any member of the myelin group may be called 

 a myelin. Upomyelin , Paromyelin, Amido-mye-lin, and 

 Sphingo-mvelin differ from myelin mainly in contain- 

 ing one or more additional nitrogenous radicles. The 

 "white substance of Schwann" and the ordinary 

 brain-juice are also called myelin. See Organo- 

 therapy. 



Myelinic (mi-el-in' -ik) [p.vz\6g, marrow]. Relating to 

 myelin. M. Nerve-fiber, the medullated nerve-fiber. 



Myelitic (mi-el-if '-ik) \jivtk6g, marrow; /rig, inflamma- 

 tion]. Pertaining to or affected with myelitis. 



Myelitis (mi-el-i'-tis) [p.veA6g, marrow ; trig , inflamma- 

 tion]. I. Inflammation of the spinal cord. 2. In- 

 flammation of bone-marrow ; osteomyelitis. See also 

 Poliomyelitis, Leuko-myelitis, and Meningo- myelitis. 

 M., Acute, that due to exposure to cold, injuries, or to 

 acute general diseases ; it is attended with sensory dis- 

 turbances and motor paralysis, complete or incomplete, 

 according to the part of the cord involved and the de- 

 gree of the inflammation. M., Ascending, a form 

 in which the inflammation travels up the cord. M., 

 Bulbar, that affecting the medulla and manifesting 

 itself in disturbances of the cardiorespiratory appa- 



ratus, dysphagia, vomiting, and other symptoms. M., 

 Central, myelitis limited chiefly to the gray matter of 

 the cord. M., Chronic, a slowly advancing myelitis, 

 presenting generally the same features as acute mye- 

 litis, but extended over a longer period. M., Com- 

 pression, the term applied to inflammation of the 

 spinal cord secondary to compressing lesions outside 

 of the cord (caries, carcinoma, or exostosis of the verte- 

 brae, aneurysm) or to tumors of the cord itself. M., 

 Concussion, that due to concussion, direct or indirect. 

 M. convulsiva. See Dubinins Disease. M., Cor- 

 nual, inflammation affecting the anterior or posterior 

 cornua. M., Descending, a form in which the in- 

 flammation extends downward, following the pyram- 

 idal pathways. M., Diffuse, widely distributed in- 

 flammation of the cord involving large areas. M., 

 Disseminated, when there are several foci. M., 

 Focal, when a small area is affected. M., Hemor- 

 rhagic, myelitis associated with or dependent upon 

 hemorrhage. M., Meningo-, a combination of 

 meningitis and myelitis. M., Pressure. See J/., 

 Compression. M. Sclerotic, a form characterized 

 by overgrowth of the interstitial tissue, which under- 

 goes contraction, producing an increase of hardness 

 of the cord. M., Systemic, a variety in which 

 the inflammation is confined to distinct systems or 

 tracts of the cord. M., Transverse, a form in which 

 the inflammatory area extends through a transverse 

 section of the cord. M., Traumatic, myelitis follow- 

 ing direct injury. M., Unilateral, a form in which 

 the lesions are confined to one side of the cord. 



Myelo- (mi'-el-o-) \_fivel6g, marrow]. A prefix denoting 

 reference to or connection with the spinal cord, or, 

 more rarely, with some other medullary substance. 



Myelocele (mi' - el - o - sel) [pve?.6g, marrow; , 

 cavity]. I. The central canal of the spinal cord. 2. 

 [nfj'hj, tumor]. See Spina bifida. 



Myelocerebellar (mi-el-o-ser-e-bel' -ar) \_ave)Mq, marrow ; 

 cerebellum, cerebellum]. Relating to the spinal cord 

 and the cerebellum. 



Myelochysis (mi- el- ok' -is -is) \_pve/.6q, marrow ; 



a pouring] . Hydrorrhachis. Protrusion of the spinal 

 marrow. 



Myeloccelia (mi-el-o-se' -le-ah). See Myelocele. 



Myelocystic (mi-el-o-sis'-tik) [/zwe/,dc, marrow ; h 

 cyst]. Both myeloid and cystic. 



Myelocystocele (mi-el-o-sis'-to-sel) \_uveA6g, marrow; 

 Kvarig, cyst; Krfkrj, tumor]. A cystic tumor 

 myelon. 



Myelocystomeningocele (mi-el-o-sis-to-men-in' '-go-sll) 

 [jxveASg, marrow; Kvariq, cyst; fif/viyt;, membrane; 

 ktjAti, tumor]. Spina bifida in which the tumor con- 

 tains myelic substance, membranes, and fluid. 



Myelocyte (mi'-el-o-sit) \jivt\6g, marrow ; nvroq, cell]. 

 I. Properly, a marrow-cell. 2. Any free nucleusol 

 a central or ganglionic nerve-cell. 



Myelodiastasis (mi-el-o-di-as'-tas-is) [uve?.6g, marrow; 

 Aiaoraatq, separation]. Severance or disintegration ol 

 the spinal cord. 



Myelodiastema (mi-el-o-di-as-te' -mah). Synonym ol 

 Myelodiastasis. 



Myelogenic (mi-el-o-jen' -ik) \jivtA6g, marrow; ; .' rr<i 

 to produce]. Originating in marrow; producing* 

 marrow-like substance. M. Leukemia, leuka&i 

 due to disease of the marrow of bones. 



Myelogenous (mi-el-of -en-us) \jivzMq marrow ; ;.-rn 

 to produce]. Originating in marrow. M. Ossifica- 

 tion, ossification taking place from the mam 

 bone. 



Myelohyphse (mi-el-o-hi' -fe) [/ivrMq, marroM 



web: prop. myelyph<r\ In biology, applied to tin 

 hyphue of lichens which differ from those of ordin 



