Wannan tsarin mai juyayi yana cikin salon ban sha'awa. Bayani da ke zuwa kuma daga kwakwalwa yana "flipped," saboda gefen hagu na kwakwalwa yana sarrafawa kuma yana karɓar bayanai daga gefen dama na jiki. Hakazalika, hagu na jiki yana sarrafawa ta gefen dama na kwakwalwa.
Magunguna a cikin kashin baya na biye da hanyoyi yayin da suke gudu zuwa kwakwalwa.
Irin wadannan nau'un jijiyoyi suna tafiya tare a cikin tsari.
Alal misali, jijiyoyin da suke gane vibration, hasken haske, da kuma tsinkayen halitta (inda jiki yake cikin sararin samaniya) duk sun shiga cikin kashin baya kuma sun hau cikin abin da ake kira ginshiƙan kwakwalwa zuwa kwakwalwa a gefe guda kamar sashin jiki wanda ba ya aiki. Ga hagu na hagu, alal misali, filoli suna hawan hagu na gefen hagu. A kusa da kwakwalwar kwakwalwa, duk da haka, ƙwayoyin sun haye zuwa wancan gefe.
Wannan yana kama da yadda tsarin da ke dauke da tausayi ya tsara zaruttun da ke nuna ɓangare na jiki don motsawa. A cikin kwakwalwa, igiyoyi sun kasance a gefe guda na jiki a matsayin ƙananan yanki, amma sun canza a kasa na kwakwalwa. Alal misali, gefen hagu na kwakwalwa yana aika sakonni sa'annan tafiya zuwa gefen dama na igiya kafin ya fita cikin hannun dama. A gefen hagu na kwakwalwa, to, yana iko da gefen dama na jiki.
Ya bambanta, ƙananan zaruttun da ke gane abin da suke ji kamar zafi da zafin jiki ba su hayewa a gindin kwakwalwar kwakwalwa amma sunyi kusan kusan kusan sun shiga cikin kashin baya daga hannu ko kafa. Fibers a gefen hagu na ƙananan kashin yana dauke da ƙananan zafi da zafin jiki daga hagu da kafa.
Kwayoyin za su iya hawan matakan kaɗan kafin su haye, duk da haka.
Damage mai lalacewa
Don haka menene ya faru idan rabin rabin kashin baya ya lalace? Ƙananan zaruruwa sun haɗa da haɓaka, haske mai haske, da kuma tsinkayyar jiki daga gefe ɗaya na jiki kamar launi. Sarrafa jiki kuma ya lalace a wannan gefen. Duk da haka, zafi da zafin jiki za a rasa daga kishiyar sashin jiki, sau ɗaya ko biyu sassa daga rauni.
Charles Édouard Brown-Séquard ne ya fara bayanin wannan bidiyon a shekarar 1850, wanda ya bayyana abin da ake kira Brown-Séquard a lokacin da yake nazarin manoma lokacin da yake cin sukari a cikin Jamhuriyar Mauritius. Mafi yawan abin da ke faruwa na wannan ciwo yana ci gaba da raunin ciwo a cikin ɓangaren baya. Saboda ciwo ya kamata ya rabu da rabin raƙuman ƙwayar, amma ya kasance mai sauƙi amma yana da amfani don kwatanta ayyukan da ke cikin kashin baya.
Idan wani yana fama da ciwo na Brown-Séquard, za a iya amfani da hotunan jima'i na ainihi don tabbatar da dalilin da kuma wurin da ya ji rauni. Bugu da ƙari, cuta, cututtuka irin su cututtuka, kumburi, ko ciwace-ciwacen ƙwayar cuta na iya haifar da Brown-Séquard. Wannan magani zai dogara ne akan yanayin lalacewar.
Sources:
Hal Blumenfeld, Neuroanatomy ta hanyar Cutar Clinical. Sunderland: Sinauer Associates Publishers 2002.
Ropper AH, Samuels MA. Ka'idodi na Adams da Victor na Lafiya, 9th ed: The McGraw-Hill Companies, Inc., 2009.