Adnexa is a term commonly used in clinical practice in obstetrics and gynecology. Most patients do not understand the meaning of adnexa, which leads to unnecessary misunderstanding during clinical consultation and treatment. Adnexa is the general term for the fallopian tubes and ovaries. The uterus is the main organ in the female reproductive system, and is the main organ for the conception of children and menstrual flow. The uterus is located in the center of the pelvis. The fallopian tubes are located on either side of the uterus, one on each side. At the end of the fallopian tubes are the ovaries, the female gonadal organ, which are also located on each side. Morphologically, the fallopian tubes and ovaries are attached to the uterus and are much smaller in size than the uterus. Therefore, in clinical practice, the fallopian tubes and ovaries are collectively referred to as the adnexa of the uterus. It is important to emphasize here that the adnexa refer to one side of the fallopian tubes as well as the ovaries. Therefore, we refer to the right fallopian tube and ovary as the right adnexa and the left fallopian tube and ovary as the left adnexa. In clinical practice, when surgical removal is required, most of the adnexa are also removed from one side. The unilateral ovarian tubes are called adnexa to avoid the trouble of naming them. Therefore, for clinical convenience, one side of the fallopian tube and ovary are collectively referred to as the adnexa.