Insikazi yesifuba sezinsikazi noma i-mammary iyisitho esenza ubisi, okudingekayo ekudleni ingane. Kubekwa umuntu okwamanje ngesonto leshumi lokuthuthukiswa kwe- intrauterine .
Ngaphambi kokukhulelwa, ubisi lwebisi lukhula ngokungenasici, futhi ngesikhathi sokukhulelwa, izilonda ze-mammary ziqala ukukhula ngamandla, amathanga ebisi akhula kanye negatsha, ama-lactocyte athuthuka, ama-glandular kanye nama-connective tissue of the glands akhula, ifomu lamagulane kanye nenani landa, futhi i-awaola ne-pigmentation iyabonakala. Ukuvuthwa okugcwele kwebele kufinyelela ngesikhathi sokubeletha ingane.
Isifuba sowesifazane sithini?
Izithobezi ze-mammary zimboza isikhumba esithambile. Phakathi nendawo ye-mammary gland iyinsipho ene-ariola, lapho kunezinhlayiya ze-sebaceous kanye ne-sweat.
Isakhiwo sesifuba sesifazane siboniswa izicubu ezigulisa ngamadayini ahlukene, i-fat tishu kanye ne-connective, ekwakheni i-lobes.
Ingxenye eyinhloko yokwakhiwa kwesifuba i-alveolus, okuyinto efana ne-vesicle. Ingaphakathi layo ligcwele amangqamuzana, umsebenzi owenza ubisi (lactocytes). I-alveoli ihlanganiswa yizinzwa nemithambo yegazi. Ngesikhathi sokukhulelwa, ukwanda kwe-alveoli, ukuze uqale ukukhiqiza ubisi ngemuva kokuzalwa kwengane. Ukuhlangana kwe-150-200 alveoli yi-lobule, idamu lama-30-80 lobules ingxenyana. Esikhathini sezinsikazi zesifuba sakwabesifazane sabelana ngamasheya angu-15-20 okudonsela amathanga, ukuhlanganisana komunye nomunye kanye nokuphela komunwe. Imfucumfucu yama-muscle e-areola isabela ekubunjweni kwengono.
Phakathi kwe-lobes kanye ne-lobules yizicubu ezixhunyanisayo ezakha isifuba esiyingqayizivele sesifuba.
Izici zokusebenza kwebele
Ukuma nobukhulu besifuba kunqunywe isilinganiso sobuxhakaxhaka, izibhamu kanye nezicubu ze-adipose.
Amakhomitha kanye nezakhi ezitholakala emthonjeni we-mammary zihanjiswa ngokusebenzisa imishanguzo. Ukuphuma kwamanzi oketshezi kwenzeka ngezitsha zethempeli nezobuhlungu. Ukungena kwegazi esifubeni kwanda ngesikhathi sokukhulelwa, ukuya esikhathini, imisebenzi yezocansi.
Isakhiwo sesifuba sesifazane siyahlukahluka kuye ngokuthi iminyaka yowesifazane, isigaba somjikelezo, isimo sesimo sangemuva , izinga lokuthuthukiswa kwendlela yokuzala, isikhathi sokukhulelwa futhi, okwamanje, lactation. Ngaphambi kokuqala kwezigulane zezinyosi zanyanga zonke, isifuba siyabala futhi siguquke.
Eminyakeni engu-20-25, isifuba esinesakhiwo esihambisanayo nobubanzi besikhala sangaphambili singaphansi kwama-5 mm. Iminyaka engu-25-40 - isikhathi sokusebenza kwesifuba. Amathanga amile afaka i-epithelium, ezindongeni ze-mammary gland avela amahlumela nge-vesicles eyimfihlo. Ngaphambi kokusuka kwesikhashana, izicubu ze-glandular ziyahlakazeka. Njengoba uneminyaka yobudala, inani le-parenchyma elibuhlungu liyancipha, i-atrophy yezicubu ezinamafutha ayenzeka. Esikhathini sesikhathi se-post-menopausal, izicubu ezinamahloni zisuswa ngokuphelele yizicubu ezinamafutha.