Mitengo ndi yovuta kwambiri ya mano a munthu
Amatchulidwa ngati mano kapena mano, awa ndi mano omwe ali kumbuyo kwa pakamwa. Amatha kukula mosiyanasiyana ndi mawonekedwe koma ndi mano akulu kwambiri pakamwa. Mitengo imayendetsedwa ndikugwiritsidwa ntchito popanga chakudya m'magawo ophweka mosavuta. Mano operewera ndi okhwima amagwiritsidwa ntchito polira ndi kudula chakudya. Mitengoyi imagwiritsidwa ntchito kuti ikhale ndi mphamvu zambiri kuchokera kutafuna, kukupera ndi kumira, ndipo molar iliyonse imamangirizika ku fupa la nsagwada ndi mizu iwiri kapena inayi.
Munthu wamkulu amakhala ndi miyezi khumi ndi iwiri, ndi zisanu ndi chimodzi mu nsagwada (yomwe dokotala wanu amadziwika kuti ndi "maxillary" chifukwa cha malo awo apamwamba) ndipo zisanu ndi chimodzi mumsana wakumunsi (wotchedwa "mandibular" ndi dokotala wamkulu wa malo awo tsaya lakuya). Mbali iliyonse ya nsagwada kumtunda ndi kumunsi imakhala ndi mizere itatu.
Mitundu Yopatsa
Pali mitundu itatu ya zolemba. Izi zimabwera mukatha mwana ataya mano awo aang'ono:
- Zolemba zoyamba, zomwe zimatchedwanso zaka zisanu ndi chimodzi zokhala ndi zolembera chifukwa ndizo zoyamba zitatu zomwe zimatha kuzungulira zaka zisanu ndi chimodzi.
- Zolemba zachiwiri, zomwe zimatchedwanso zaka khumi ndi ziwiri zokha chifukwa zimatha zaka 12.
- Zolemba zitatu, kapena nzeru za mano, zomwe zimaoneka pakati pa zaka 17 ndi 25.
Anatomically, zofukula zakonzedwa kuti zikhale ndi mphamvu zambiri kuchokera kutafuna, kukupera ndi kumangiriza, pokhala ndi korona yaikulu ndi mizu iwiri kapena inayi yomwe imayikidwa mwamphamvu m'fupa.
N'chifukwa Chiyani Timakhala ndi Nzeru?
Nthano yachitatu, kapena mano a nzeru , ndizochokera ku mapangidwe athu akale pamene pakamwa pa umunthu panali zazikulu ndi zokhala ndi mano ena.
Mano ena owonjezerawa anali othandiza pakufuna chakudya makamaka monga mizu, mtedza, masamba ndi nyama zolimba. Chakudya choterechi chinali cholimba pa mano - makamaka popanda zipangizo zowonetsera zomwe timakondwera nazo masiku ano monga nsabwe za mano, phala, ndi floss-motero mano athu akale ankakhala ndi zofunda ndi zowonongeka kwambiri chifukwa cha kuvunda kwa dzino .
Ngakhale kuti masiku ano anthu amadziwika kuti "Paleo," anthu samadya zakudya zomwe zimafuna mano ena owonjezera. Zakudya zathu nthawi zambiri zimakhala zosavuta kwambiri, komanso ndi kuphika ndi ziwiya, tsiku la nzeru zino zatha. Chisinthiko, komabe, sichinatichitire ife pano, ndipo kotero ife timatengabe mano ena owonjezera mmbuyo mwaunyamata wathu.
Vuto la Nzeru Zazinthu
Ngakhale kuti sanataya mano athu a nzeru komabe, chisinthiko chakhala, mwatsoka, adapanga kusintha kwa kukula kwa nsagwada zathu m'mbiri yathu yonse. Nsagwada za anthu amakono ndizochepa kuposa makolo athu. Izi zimabweretsa mavuto ambiri pamene mano opatsa nzeruwo amayesa kulowa mkati.
Pamene mano a nzeru amapanga, amatha kutsekedwa ndi mano ena, ndipo amatchulidwa kuti " akukhudzidwa ." Ngati dzino la nzeru liphulika pang'onopang'ono, izi zingapangitse malo ovuta kuti apeze mabakiteriya omwe angabweretse ku matenda aakulu a chifuwa ndi minofu yowzungulira. Mano a nzeru sangathenso kutha. Izi zimayambanso mavuto, kuphatikizapo chitukuko chokhacho cha makoswe kapena zotupa zomwe zingathe kuwononga kwambiri nsagwada ndi mano ngati zitasiyidwa.
Mavuto amenewa ndi chifukwa chake anthu ambiri amafunika kuchotsa mano awo anzeru.
Ndikoyenera kuti opaleshoniyi ikuchitika panthawi yaunyamata pamene mavuto alionse ndi ochepa komanso osawerengeka.
Kwa anthu ena, owerengera pafupifupi 15 peresenti ya anthu, sipangakhale kusowa kwachangu kuti mano amatha kuchotsedwa chifukwa amalowa popanda nkhani. Ngakhale m'mayesero amenewa, zingakhale zolimbikitsidwa kuti mano amatha kuchotsedwa kuti asapezeke mavuto omwe angakhalepo mtsogolo pamene opaleshoni ili ndi zovuta zambiri komanso nthawi yayitali.