Komzimba Human: isakhiwo ngesandla

Anatomy of isandla nto inzima kakhulu. Ngoko ke, imithambo, imithambo, imizwa kunye imisipha branched kwaye rhoqo uwele omnye komnye, kwaye uthungelwano imisipha kunye nemisipha liphendule zonke umyalelo ebuchotsheni. Ngaphezu koko, kulula ukuba ukugoba, wabagawula.   Ubume isandla ithetha ubunzima enkulu phezu izihlunu, kuba ngexesha le mini umntu uvelisa iintlobo ngeentlobo zeentshukumo, kwaye imo yabo ixhomekeke ngesandla.

Konke oku isakhiwo isandla entsonkothileyo egqunywe yesikhumba, nosebenza njengokhuselo yayo yibhaktheriya, izinto eziyityhefu kunye radiation. Kufuneka kuqatshelwe ukuba amanzi, uyakwazi ukugcina ubushushu bomzimba ethile kwaye ukuqokelela ulwazi oluvo ukuba iphuma ngaphandle, ngoko ke isakhiwo isandla It ivumela uvakalelo okulawula ezo izinto awanyakazela ngayo abafowunelwa ngesandla.

Umaleko esezantsi imvaba ngasemva ngebrashi ezingcakacileyo, ngoko izandla yingqele rhoqo ngaphezu kwezinye imizimba. Le dermis kwicala emva uba imali encinci ukubila kunye kwamadlala sebaceous, nto leyo esisizathu sokuba isikhumba iyoma ngokukhawuleza. Lo maleko isikhumba iquka luvo ngaphezulu, nkovu kunye nempahla yegazi, kwakunye collagen kunye elastin ezenza kube ixesha elide yaye liyaxhathisa. Noko ke, eyingozi kukhanya, leyo ingena dermis, iba nefuthe elibi kule iiprothini ezimbini, ngoko ke ulusu isandla ulahlekelwa luthambe, kunye imibimbi zayo ngokukhawuleza.

Ubume isandla inazo iimpawu ezikhethekileyo. Ngenxa yoko, iiseli ezivelisa bala lintsundu ibekwe kule nwebu asezantsi sangaphandle. Ngenxa noko isikhumba sithola ukukhanya yelanga, nto leyo ethi ithintele umthondo yayo kungena dermis. Ukuba imitha yelanga kuba nempembelelo elide kakhulu eluswini, oko kukhokelela ekubeni kusekwe amabala ubudala.

Ubume isandla somntu, kubandakanywa, iwotshi, zingathathwa njenge isahluko eyahlukileyo. Ziqulethe amathambo ezingamashumi amabini anesixhenxe ukuba ngokugqibeleleyo azalisekise imisebenzi yawo, yaye imisipha, izihlunu eziqhotyoshelwe amathambo.

Ukuba sihlolisisa amathambo brush, ukuze sikwazi ukubona apha ezisibhozo amathambo eyenza iwotshi, amathambo ezintlanu uyila pastern (iwotshi), kunye namathambo elinesine zakha phalanges.

amathambo Carpal iqulathe lemiqolo ezimbini amathambo ezine ngamnye. I Umqolo wokuqala luquka scaphoid kunye lunate amathambo, kwakunye antlangothi emithathu yaye pisiform. ukrozo lwesibini - ithambo trapezoid, capitate bone hamate.

Amathambo isandla Ziqulethe uluhlu intloko isiseko (ngenqindi) kunye nomzimba. Amathambo iminwe luqulathe phalanges amathathu, ngaphandle nasesithupheni (yena phalanges ezimbini).

Ukuqwalasela isakhiwo ngesandla Kufuneka kuqatshelwe ukuba izihlunu abalawula esihlahleni nesandla, bekuthi. Zahlula-hlulwe phambi (elijongene flexion), ngasemva (linoxanduva ulwandiso) kunye nezihlunu ehamba (inceda ukwenza intshukumo neminwe).

Isandla owenza le misebenzi ilandelayo: okubamba, iintshukumo ecacileyo olulungelelanisiweyo, esibuhlungu.

Ngaloo ndlela, isandla iqhotyoshelwe umzimba ngoncedo amathambo, izihlunu kunye namalungu, kwaye iqulathe ezintathu: zengalo, igxalaba nesandla. Ukugoba kwi ingalo engqinibeni inika yokuhamba kunye nokusebenza, ukuze sikwazi ukwenza iintlobo zeentshukumo.

Kufuneka kuqatshelwe ukuba iincam iminwe iiseli yovakalelo, apho umntu efunda ihlabathi ngokuthinta, nto ke leyo ebangele ukuba avelana intlungu. Ukukhusela iinzipho zabo khona ukuba bamele uphondo ipleyiti equka zenziwe ngekeratini, zenziwe ngekeratini gangqa eluswini. Ngoko, ke aneentunja, kunzima kunye fuku ngaphantsi phezu zoqhagamshelwano ngamanzi apho.

Ubume iingalo kuvumela umntu ukwazi ihlabathi ngeenxa zonke kuye kwebala nokusebenzisa izinto, nto leyo eyenza kube yahlukile naziphi na ezinye iintlobo mammalian.