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The placenta is a temporary organ that forms in the uterus during pregnancy. It attaches to the uterine wall and connects to the fetus via the umbilical cord, facilitating the exchange of nutrients, gases, and waste between the physically separate maternal and fetal circulations. The placenta is a complex organ, performing the functions of the lungs, gut, kidneys, and liver of the fetus. Interestingly, the placenta is encircled by a ring of smooth muscle cells, though the functional importance of this muscular ring is not yet fully understood.
| Characteristics | Values |
|---|---|
| Definition | A temporary organ that forms in the uterus during pregnancy |
| Shape | Round and flat |
| Functions | Provides oxygen, nutrients, and hormones to the baby; removes harmful waste and carbon dioxide from the baby; passes immunity from the mother to the baby |
| Weight | Around 16 ounces (1 pound) by the time the baby is born |
| Length | About 10 inches |
| Thickness | 1 inch |
| Composition | Blood vessels, lobes, villi, umbilical cord, and a marginal sinus |
| Types of Placenta | Placenta previa, placenta accreta, placental abruption, placental insufficiency, retained placenta, succenturiate placenta |
| Encircled by | A ring of smooth muscle cells |
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What You'll Learn
The placenta is a temporary organ that develops in the uterus during pregnancy
The placenta is a vital, temporary organ that forms in the uterus during pregnancy. It is not a muscle, but it is encircled by a ring of smooth muscle cells. It is made up of several layers of tissue and is necessary for a healthy pregnancy for both mother and fetus. The placenta develops shortly after conception when a fertilized egg implants into the uterine wall. It then continues to grow throughout the pregnancy, providing essential support to the baby.
The placenta is responsible for supplying the fetus with nutrients and oxygen from the mother's blood through the umbilical cord. It also filters out harmful waste and carbon dioxide from the baby's blood. Additionally, it produces hormones that aid in the baby's growth and passes immunity from the mother to the baby. The placenta has a disc-like shape, with a reddish-blue colour on the side attached to the uterus and a grey colour on the side facing the baby.
The position of the placenta in the uterus can vary, and it can form anywhere where the fertilized egg implants into the uterine wall. Some common positions include the posterior placenta, where it grows on the back wall of the uterus, and the anterior placenta, where it grows on the front wall closest to the abdomen. The placenta can also grow at the top or on either side of the uterus.
Proper development of the placenta is crucial for a successful pregnancy. Certain conditions, such as placenta previa, placenta accreta, placental abruption, and placental insufficiency, can cause complications and even lead to fetal abnormalities or adverse events in the mother. Therefore, it is essential to monitor the placenta's health and position during pregnancy to ensure a positive outcome for both the mother and the fetus.
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It provides oxygen and nutrients to the foetus
The placenta is a temporary organ that forms in the uterus during pregnancy. It attaches to the uterine wall and provides nutrients and oxygen to the foetus through the umbilical cord. The placenta is made up mostly of blood vessels contained within structures called "villi". The blood vessels connect with the foetus's bloodstream through the umbilical cord. The rest of the placental tissues mainly connect the villi to the umbilical cord and allow the mother's blood to bathe the villi, supplying the foetus with oxygen and nutrients.
The marginal sinus of the intervillous space is separated from the chorionic and basal plates by a layer of cells expressing desmin, alpha- and gamma-smooth muscle actins, and smooth muscle myosin. These cells share all features with smooth muscle cells. This muscular ring is continuous with the media of uteroplacental veins entering the marginal sinus. In the basal plate, the muscle cells may extend far into the central parts of the placenta. The muscular ring is separated from the intervillous space by a layer of endothelial cells. They are continuous with the maternal endothelium of the marginal uteroplacental veins.
The placenta receives blood supply from both the maternal and foetal systems and thus has two separate circulatory systems for blood: the maternal-placental (uteroplacental) blood circulation and the fetal-placental (fetoplacental) blood circulation. The uteroplacental circulation starts with maternal blood flow into the intervillous space through decidual spiral arteries. Exchange of oxygen and nutrients takes place as the maternal blood flows around terminal villi in the intervillous space. The in-flowing maternal arterial blood pushes deoxygenated blood into the endometrial and then uterine veins back to the maternal circulation.
The foetal-placental circulation allows the umbilical arteries to carry deoxygenated and nutrient-depleted foetal blood from the foetus to the villous core fetal vessels. After the exchange of oxygen and nutrients, the umbilical vein carries fresh oxygenated and nutrient-rich blood circulating back to the foetus.
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The placenta is made up of blood vessels
The placenta is a temporary organ that forms in the uterus during pregnancy. It attaches to the uterine wall and provides nutrients and oxygen to the baby through the umbilical cord. The placenta is made up of mostly blood vessels contained within structures called "villi". These blood vessels branch out over the surface of the placenta, forming a network covered by a thin layer of cells. This results in the formation of villous tree structures, which allow the mother's blood to bathe the villi and supply the baby with oxygen and nutrients. The vessels also connect with the baby's bloodstream through the umbilical cord, acting as the baby's lifeline while in the uterus.
The placenta has an important role in hormone production, taking over from the corpus luteum by the end of the first trimester. It produces hormones that help the baby grow and passes immunity from the mother to the baby. It also filters out harmful waste and carbon dioxide from the baby's blood, acting as the baby's kidneys and liver until birth.
The placenta is typically delivered shortly after the baby, usually between five and thirty minutes after. It weighs around 16 ounces (1 pound) by the time the baby is born. The placenta is about 10 inches long and 1 inch thick at its centre, with the edges being thinner.
The placenta is encircled by a ring of smooth muscle cells, which may extend into the central parts of the placenta. The functional importance of this muscular ring is currently unknown.
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It is encircled by a ring of smooth muscle cells
The placenta is a temporary organ that forms in the uterus during pregnancy. It attaches to the uterine wall and provides nutrients and oxygen to the baby through the umbilical cord. The placenta is a flat, disc-like structure, rich in blood vessels, and is made up of two sides: the side attached to the uterus and the side closest to the baby.
The human placenta is encircled by a ring of smooth muscle cells. This muscular ring is continuous with the media of uteroplacental veins entering the marginal sinus. The marginal sinus of the intervillous space is separated from the chorionic and basal plates by a layer of cells expressing vimentin, desmin, alpha- and gamma-smooth muscle actins, and smooth muscle myosin. Ultrastructurally, these cells share all the features with smooth muscle cells.
The marginal zone of the human term placenta has been studied using transmission electron microscopy and immunohistochemistry. The results indicate that the marginal sinus of the intervillous space represents the dilated and merged parts of uteroplacental veins. The lateral growth of the human placenta partly takes place by expansion into these uteroplacental veins. The functional importance of this muscular ring remains unknown.
The placenta is a highly complex organ that acts as the lungs, gut, kidneys, and liver of the fetus. It also has major endocrine functions, producing hormones that support fetal development and modulate maternal physiology and metabolism. The placenta is a unique vascular organ with two separate circulatory systems: the maternal-placental (uteroplacental) and the fetal-placental (fetoplacental).
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The umbilical cord connects the foetus to the placenta
The placenta is a temporary organ that develops in the uterus during pregnancy. It attaches to the uterine wall and provides nutrients and oxygen to the foetus through the umbilical cord. The umbilical cord is a bundle of blood vessels that develops during the early stages of embryological development. It is enclosed inside a tubular sheath of amnion and consists of two paired umbilical arteries and one umbilical vein. The umbilical vein carries oxygenated, nutrient-rich blood from the placenta to the foetus, while the umbilical arteries carry deoxygenated, nutrient-depleted blood from the foetus back to the placenta. This is the opposite of what is normally seen, where veins carry deoxygenated blood and arteries carry oxygenated blood. However, this naming convention reflects the fact that the umbilical vein carries blood towards the foetus' heart, while the umbilical arteries carry blood away.
The development of the umbilical cord begins in the third week of embryologic formation. The umbilical vein continues towards the transverse fissure of the liver, where it splits into two branches. One of these branches joins with the hepatic portal vein, which carries blood into the liver, while the other bypasses the liver and flows into the inferior vena cava, which carries blood towards the heart. The two umbilical arteries branch from the internal iliac arteries and pass on either side of the urinary bladder into the umbilical cord, completing the circuit back to the placenta.
The main function of the umbilical cord is to house the umbilical vessels, which circulate blood between the foetus and the placenta. Without this connection to the placenta, the foetus would be unable to receive oxygen and other nutrients, and it would be unable to filter out carbon dioxide, urea, and other waste products. The umbilical cord also provides ample space for the foetus to move and grow. During this time in utero, Wharton's jelly protects the umbilical vessels so that the foetus can move and turn without compressing its blood supply.
In some cases, the umbilical cord may not be directly connected to the centre of the placenta. This condition, known as marginal cord insertion or battledore placenta, occurs at a rate of 9% in singleton pregnancies and is more common in twin pregnancies (24 to 33%). Marginal cord insertion is associated with various complications, including intrauterine growth restriction, preterm labour, and foetal distress. Another abnormality is velamentous cord insertion, which occurs in 1 to 2% of pregnancies. In this case, the umbilical vessels begin to spread out before reaching their normal insertion site at the centre of the placenta, leaving them susceptible to compression and rupture.
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Frequently asked questions
The placenta is a temporary organ that forms in the uterus during pregnancy. It attaches to the uterine wall and provides nutrients and oxygen to the baby through the umbilical cord. It also removes harmful waste and carbon dioxide from the baby, produces hormones that help the baby grow, and passes immunity from the mother to the baby.
The placenta is not a muscle, but it is encircled by a ring of smooth muscle cells.
The placenta looks like a disc of bumpy tissue rich in blood vessels, giving it a dark red colour.
