Differences Between Anterior Placenta and Placenta Previa
May 06, 2021
Source: Cainiu Health
Dr. Zhang Chunxia
Introduction
An anterior placenta refers to a placenta that implants on the anterior wall of the uterine cavity following conception; this is a normal physiological phenomenon of pregnancy. Under normal circumstances, the placenta may implant on the anterior wall, lateral walls, posterior wall, or fundus of the uterus. In contrast, placenta previa is a pathological condition of pregnancy characterized by abnormal placental implantation—specifically, when the placenta remains implanted in the lower uterine segment or its lower edge lies close to or covers the internal cervical os at or beyond 28 weeks’ gestation.
The placenta is a vital organ facilitating material exchange between the fetus and the mother. It is a unique maternal-fetal tissue structure formed during human pregnancy through the union of embryonic chorionic membranes and the maternal uterine endometrium. While developing within the uterus, the fetus relies on the placenta to obtain nutrients from the mother, yet both maintain considerable physiological independence. Additionally, the placenta synthesizes various hormones, enzymes, and cytokines essential for sustaining normal pregnancy. So, what are the key differences between an anterior placenta and placenta previa? The following section addresses this question.
Differences Between Anterior Placenta and Placenta Previa
An anterior placenta refers to implantation of the placenta on the anterior wall of the uterine cavity—a normal physiological occurrence in pregnancy. Under normal circumstances, the placenta may attach to the anterior wall, lateral walls, posterior wall, or fundus of the uterus. In contrast, placenta previa is a pathological condition characterized by abnormal placental implantation: specifically, when, after 28 weeks of gestation, the placenta remains implanted over the lower uterine segment, its lower edge approaches or overlaps the internal cervical os, or it covers the internal cervical os entirely. Placenta previa is a serious obstetric complication that can cause massive antepartum or intrapartum hemorrhage and therefore warrants close clinical attention.
Knowledge Expansion: Functions of the Placenta
1. Qi- and Blood-Tonifying Effects
Because the placenta contains diverse trace elements, carbohydrates, proteins, vitamins, and other nutrients, it exerts significant tonic effects—particularly for individuals with lung qi deficiency (manifesting as chronic cough and breathlessness), spleen qi deficiency (manifesting as poor appetite, anorexia, weight loss, fatigue, and loose stools), or dual qi- and blood-deficiency (manifesting as sallow complexion, dizziness, palpitations, insomnia, and forgetfulness).
2. Immune Enhancement
Due to its rich content of multiple hormones and bioactive substances, the placenta exhibits corresponding pharmacological actions. In pregnant women, it promotes development of the mammary glands, uterus, and ovaries, enhances systemic resistance, and confers anti-allergic properties. Moreover, it also supports thyroid and testicular function. Additionally, the placenta aids wound healing and accelerates collagen synthesis.
3. Skin Beautification and Nourishment
The placenta effectively improves conditions such as melasma and skin laxity. By harmoniously tonifying both qi and blood as well as yin and yang, it helps fade hyperpigmentation, restore skin elasticity, and promote a rosy, smooth, and lustrous complexion. Furthermore, the placenta possesses antimicrobial properties: its gamma globulin contains antibodies against measles, influenza, diphtheria toxin, and other pathogens.
The above outlines the key distinctions between anterior placenta and placenta previa. We hope this information proves helpful.
