Do you still do n’t know if you do n’t know about the fetal B ultrasound?

I have written several science science articles about the B -ultrasound examination during pregnancy, but there are still many pregnant mothers consulting some of the problems of B -ultrasound during pregnancy. I will give you a science.

Human mothers have a life of 280 days. The entire childbirth period is divided into early pregnancy, mid -term pregnancy and advanced pregnancy. Different pregnancy periods, the content and focus of B -ultrasound are different.

Early pregnancy ultrasound examination

Gestational sac

The first detection of the pregnancy symbol of the ultrasound is the pregnancy sac. The gestational sac ultrasound manifestation in the center is the dark region (fluff cavity), and the surrounding area of the dark area is a complete and uniform thick echo.The deciduous composition, the pregnancy sac increased by about 1.2mm per day.

Yolk sac

The yolk sac is the first anatomical structure that can be found in the ultrasound in the pregnancy sac. When normal pregnancy, the yolk sac is spherical, the thin line of the sac wall is thin and strong, the sound is good, the maximum does not exceed 5-6mm, the yolk is yellow during 7 weeks of pregnancy, and the yolk is yellow during 7 weeks of pregnancy.The maximum average inner diameter of the sac is 5mm. After 10 weeks, the yolk sac gradually reduces. About 12 weeks, the yolk cylinder no longer detects the ultrasound (no more report on the ultrasonic report form).<3mm, or no display, it is prompted to have poor pregnancy consequences.

Gels and Cartoonism

The heart tube pervasion has begun on the 36th day of pregnancy. The vaginal ultrasonic can detect the fetal heart motion at 34 days of pregnancy. At this time, the germ length is 1.6mm. Generally speaking, when the embryo is 4-5mm,The corresponding gestational week of the heart that can be detected is 6-6.5 weeks, and the corresponding gestational sac size is 13-18mm.In the abdominal ultrasound examination, at 8 weeks of pregnancy, the average inner diameter of the pregnancy sac is 25mm. You should be able to see the fetal heart.In the early pregnancy, the fetal heart rate of different gestational weeks was different. Before 6 weeks, the heart rate of the fetal heart rate was slow, often 100-115 times/min, and the fetal heart rate was 144-159 times/min at 8 weeks. The heart rate stabilized after 9 weeks.137-144 times/min, at this time the heart rate changes very little.

Long head

At 6-10 weeks of pregnancy, the anatomical structure of the embryo changes hugely. In this period, the head and hips are growing by about 1mm per day. At this time, the embryo head is the fastest and the change is the most significant. At this time, amniotic sac will occur.

7-8 weeks of pregnancy, buds in the upper and lower limbs grow, accompanied by early development of hands and feet. At the beginning of 8 weeks, the embryo had a human shape.On the 9th week, the fetal limbs were more obvious, and the trunk began to grow and straighten.In the 10th week, the germ is about 30-35mm. The embryo has a human shape, which can display the hands and feet, and can distinguish it.

Central Nervous System

At 7-8 weeks of pregnancy, the primitive brain bubbles in the embryo head can be clearly displayed. By weekend 8th, the double top diameter is about 8mm at this time.The easiest to display is the veins.Week 10 of the skulls began to be ossifying.The 11-12 weeks, the skull osteoma is obvious, and the basic structure in the brain has basically formed in 11-12 weeks.Display these structures.

The fetal spine is manifested as a low echo equal line before 10 weeks of pregnancy. After 10 weeks, the spine begins to be calcified, but the calcification of the tail tail can not be completed until 16-18 weeks.

Fetal heart

The heart first is a single tubular structure. After 8 weeks, the heart is divided into separation. The fetal heart structure may be displayed at 10 weeks of pregnancy after the vaginal ultrasound examination, but most of the fetal heart can only display the four -cavity heart structure after 12 weeks. Early pregnancy during early pregnancy.It is difficult to fully evaluate the fetal heart by ultrasound, so there is no report on the B -ultrasound.

Urinary system

The fetal kidney can be detected by vaginal ultrasound at 9 weeks of pregnancy. 86-99%of the fetus in 12 weeks can display the kidneys. The display rate of 13 weeks can reach 92-99%.%.

Fetal abdomen

The fetus’s stomach is a small non -echo structure on the left side of the upper abdomen during the early pregnancy. At 12 weeks, the fetal stomach display rate can reach 97%, and the fetus will not swallow after 12-13 weeks.

The fetal gallbladder cannot be displayed before 13 weeks of pregnancy. The display rate at 13 weeks is only 50%. After 14 weeks, normal fetuses can often detect gallbladder.

Fetal limb

In the 8th week of pregnancy, limb sprouts can be detected by ultrasound, and the humerus and femur can be distinguished in the 9th week. In the 10th week, tibia, fibula and ruler, and radius can be displayed.With the toe, the fetal fingers during the early pregnancy are stretched out and it is easy to display. The fingers of the fetus in the middle and late stages of the fetus are often in a fist, so sometimes the fingers will be reported on the B -ultrasound.

Facial Facial Facial

The maxillary and mandibular bones can be displayed from 9-10 weeks of pregnancy, and the orbital, nose, and lips can be displayed in 10-11 weeks. It is not formed completely in 11 weeks.The anatomical structure is fully developed.

Ultrasound anatomy of fetal fetal fetus in the middle and late pregnancy

Fetal brain

Due to the relationship between the carcass position at this time, it is most likely to obtain the horizontal section image of the hill brain, the side of the brain and the cerebellum. During this period, the B -ultrasound will report the transparent intervals. The normal value does not exceed 10mm.The three brain chambers, the width is normal than 2mm. During the entire pregnancy period, the inner diameter of the fetal chamber pillow angle should be less than 10mm, and the veins of the sugar element are rich in the veins in the side of the brain.

Horizontal cutting surface

The cross diameter of the cerebellum grows with the growth week of the gestational week. Before 24 weeks of pregnancy, the cerebellum diameter is about 20mm (such as 20mm is 20 weeks of pregnancy), 20 weeks of pregnancy to 38 weeks, and the average growth rate is 1-2mm/week.The average growth rate after 38 weeks of pregnancy is 0.7mm/week.

Fetal limbs

Human bones need to take more than 20 years from the early differentiation of embryo to the improvement of development.

The fetal B -ultrasound during pregnancy, as well as fetal chest, abdomen, amniotic fluid, placenta, umbilical cord, etc. There have been related science science articles before, and this time will not be repeated.

Now every expectant mother’s birth check is B -ultrasound, which is still interested in B -ultrasound. The tangled is still the B -ultrasound. This time, I told you so much. I hope it will be a bit helpful to everyone.

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