Isifuba sesibhokhwe okanye isifuba sinomzimba ovelisa ubisi, okuyimfuneko yokondla umntwana. Kubekwe ngumntu sele sele eveki yeshumi yokuphuhliswa kwe- intrauterine .
Ngaphambi kokuphelelwa komntwana, ubisi obushushu buya kwanda ngokungabalulekanga, kwaye ngethuba lokukhulelwa, izilwanyana ezinomhlaza ziqala ukukhula ngamandla, ubisi obumnyama bukhula kunye negatsha, i-lactocytes ikhula, i-tlandular and tiscues tisses ze-glands zikhula, ifomu ye-lobules kunye nenani liyakhula, kwaye i-porola ne-pigmentation iyenzeka. Ukukhula okupheleleyo kwesifuba kufinyelela ngexesha lokuzala umntwana.
Ubumbele bhinqa njani?
Izithobezi zentloko zimboza isikhumba esilula. Phakathi kwendawo ye-mammary gland yi-ingxube ene-areola, apho i-sebaceous and sweat glands.
Isakhiwo sesifuba sesibhakabhaka simele senziwe ngamathambo e-glandular kunye namanqwanqwa e-diameter ehlukeneyo, izicubu ezinamafutha kunye nokuzibandakanya, ukwakha i-lobes.
Icandelo eliyinhloko lesakhelo sesifuba yi-alveolus, eyona hlobo lwe-vesicle. Ingaphakathi layo lihlanganiswe neeseli, umsebenzi owenzayo ubisi (i-lactocytes). I-alveoli ihlanganiswa ngamathambo kunye nemithambo yegazi. Ngexesha lokukhulelwa, ukwanda kwe-alveoli, ukuze uqale ukuvelisa ubisi emva kokuzalwa komntwana. Umbutho we-150-200 alveoli yi-lobule, i-pool ye-30-80 lobules iyinxalenye. Kwisistim sebhinqa sinikela izabelo ezi-15-20 eziye zithatha amadonti, zidibanisana kunye kwaye ziphela kwi-ingono. Iimbumba ze-muscle kwi-areola zithatha isiphumo sokumiswa kwengxobo.
Phakathi kwe-lobes kunye ne-lobules yinyama edibeneyo eyenza isifuba esisodwa sebele.
Iimpawu zokusebenza kwebele
Ubume nobukhulu besifuba bunqunywe ngumlinganiselo woqhagamshelwano, i-glandular ne-adipose tissue.
IiHormones kunye nezondlo kwi-mammary gland zihanjiswa ngeemitha. Ukuphuma kwe-fluid kuvela kwiinqanawa ze-lymphatic and venous. Ukungena kwegazi kwibele kunyuka ngexesha lokukhulelwa, ukuya esikhathini, umsebenzi wesondo.
Isakhiwo sesifuba sesibhobho siyahluka ngokuxhomekeke kwiminyaka yowesifazane, isigaba somjikelezo, isimo semvelaphi ye- hormonal , izinga lokuphuhliswa kwenkqubo yokuzala, ixesha lokukhulelwa kwaye, ngokuqinisekileyo, i-lactation. Ngaphambi kokuqala kweengqungquthela zenyanga zonyama, isifuba siphelile kwaye siyathukuthela.
Kwiminyaka engama-20-25, isifuba esinesakhiwo esifanayo kunye nobubanzi besikhala esingaphantsi kwe-5 mm. Iminyaka eyi-25-40 - ixesha lokusebenza kwebele. Amathanga e-Milky afaka i-epithelium, kwiindonga ze-mammary gland avela amaqabunga ngamacinicle eyimfihlo. Ngaphambi kokusuka kwimizimba, izicubu ze-glandular ziyahlakazeka. Xa uneminyaka yobudala, inani le-glandular parenchyma liyancipha, i-orrophy of tissue tissue iyenzeka. Kwixesha le-post-menopausal, izicubu ezinobunzima zithatyathwa ngokuthe tye kwiithambo ezinamafutha.