Le sein désigne l'une des deux mamelles de la femme ou, plus rarement, de l'homme. Les seins (donc, dans le cas de l’espèce humaine) sont situés sur la partie antérieure du thorax ; les seins de la femme sont proéminents, car ils comportent du tissu adipeux (graisse). Par ailleurs, ils possèdent des glandes mammaires qui, comme chez les autres mammifères, permettent l’allaitement des jeunes dès la naissance.

Le mot vient du latin sinus, « courbure, sinuosité, pli », qui désignait notamment un pli de la toge recouvrant la poitrine. Son emploi au figuré l'a fait désigner la partie du corps correspondante.

Introduction

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Un réseau de canaux galactophores est présent à l'état rudimentaire chez les individus des deux sexes, de l'âge embryonnaire à l'âge adulte, mais seules les femmes, sous l'influence hormonale à partir de la puberté, le long des cycles et pendant la grossesse et l'allaitement, développent la partie glandulaire.

More on [ Sein ]

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