Women's rights are the rights and entitlements claimed for women and girls worldwide. They formed the basis for the women's rights movement in the 19th century and the feminist movements during the 20th and 21st centuries. In some countries, these rights are institutionalized or supported by law, local custom, and behavior, whereas in others, they are ignored and suppressed. They differ from broader notions of human rights through claims of an inherent historical and traditional bias against the exercise of rights by women and girls, in favor of men and boys. Issues commonly associated with notions of women's rights include the right to bodily integrity and autonomy, to be free from sexual violence, to vote, to hold public office, to enter into legal contracts, to have equal rights in family law, to work, to fair wages or equal pay, to have reproductive rights, to own property, and to education. The uterus (from Latin "uterus", plural uteri) or womb (/wuːm/) is the main hormone-responsive, secondary sex organ of the female reproductive system in humans, and most other mammals. Events occurring within the uterus are described with the term in utero. In the human, the lower end of the uterus, the cervix, opens into the vagina, while the upper end, the fundus, is connected to the fallopian tubes. It is within the uterus that the embryo and later fetus develops during gestation. In the human embryo, the uterus develops from the paramesonephric ducts which fuse into the single organ known as a simplex uterus. The uterus has different forms in many other animals and in some it exists as two separate uteri known as a duplex uterus. In medicine, and related professions the term uterus is consistently used, while the Germanic-derived term womb is commonly used in everyday contexts.