Ezilwaneni ezincelisayo, ingono (ebizwa nangokuthi i-mammary papilla noma umsele ) ukubonakala okuncane kwesikhumba okuqukethe izitolo zamapayipi ama-lactiferous ayi-15 kuya kwezi-20 ahlelwe ngokuzungeza ithiphu. Marsupial futhi ezincelisayo eutherian ngokuvamile anenombolo ngisho izingono ahlelwe bilaterally, kusukela abambalwa njengoba 2 abaningi ngangokunokwenzeka 19. Isikhumba ingono amumethe wangaphela ekhethekile izinzwa ukuthi ebucayi ezintweni ezithile yilezi: lawa kancane-ukujwayeza kanye nokuthumela ngokushesha-ukujwayeza cutaneous mechanoreceptors.Ama-Mechanoreceptors akhonjwa ngokulandelana ngohlobo Ngiguqula kancane kancane ngezitho zokuphela eziningi zeMerkel corpuscle no Type II ukuzivumelanisa kancane nezitho zokuphela ze-Ruffini corpuscle, kanye nohlobo Ngiguqula ngokushesha izitho eziningi zokuphela ze-Meissner corpuscle no Type II ukuzivumelanisa ngokushesha nezitho zokugcina zomzimba wePacinian .Ukunikezwa kwezinzwa okuvelele engonweni kuvela emagatsheni aqhekekile asemaceleni enzwa yesine ye-intercostal. Ingono isetshenziswa futhi njengophawu lomumo womzimba.Imaka i-T4 (i-vertebra yesine ye-thoracic) yesikhumba futhi ihlala phezu kwezinga elilinganiselwe le-diaphragm. Ukunikezwa kwemithambo yengono nasesibeleni kuvela emagatsheni angaphakathi angaphakathi emithanjeni yangaphakathi ye-thoracic (mammary); umthambo wesifuba oseceleni; nemithambo ye-thoracodorsal.Imithambo yegazi ifana nemithambo yegazi. Amapayipi e-lymphatic aconsa ingono ayafana nesifubaAma-axillary node angama-axicalary node, iqembu le-lateral neqembu langaphambili.5% we-lymph ukhanywa ngezindawo ezingama-axillary lymph node eziseduze nomakhwapheni.