Didascalia

At 12 weeks (fetal length 6cm), the fetal structures are fully formed. Using external ultrasound equipments with twice as much frequency than the usual ones, it is possible to observe anatomical details as small as tenth of a millimeter. The ultrasound pictures in these pages were obtained by conducting abdominal scans by a specialized sonographer, which was modified for the first trimester by the author of this website.

With invasive procedures (amniocentesis/villocentesis) it is not possible to get a complete information on the fetus

  • Chromosomal defects occur at the time of conception, when chromosomes are formed in an erroneous qualitative and quantitative manner as in the case of trisomy 21. In other words the bricks that have been delivered are wrong both in number and quality. With amniocentesis it is possible to check and verify only this aspect, which although important, has a very small probability of occurrence.
  • Congenital defects, can be define, as an irregularity in the assembly of the fetal structures. In other words, when the bricks that have been delivered are adequate in number and quality but they are erroneously assembled. This is the reason why congenital defects, which have a higher probability of occurrence, cannot be detected with amnio/villocentesi, but with ultrasound scan. 

 

At 12 weeks the fetus if fully formed in terms of organization and “assembly” of all the apparatus: with appropriate ultrasound equipments, time and competence, it is possible to conduct a detailed study. It is also possible to call this ultrasound pre-morfology. Most of the anomalies are already present and can already be diagnosed at this stage. The ultrasound pictures in these pages were obtained by conducting abdominal scans by a specialized sonographer under the direction of the author of this website.

 

FACE, SKULL, BRAIN at 12 weeks

     

 

 

 

 

 

 

 

 

 

Examination of the orbite ond of the palato. The transversal section of the head shows the linea mediana of the brain

 

VERTEBRAL COLUMN at 12 weeks

  

 

 

 

 

 

 

 

 

Longitudinal view showing the vertebral column

 

THE HEART at 12 weeks

 

 

 

 

 

 

 

 

 

 

At this stage the heart is as big as a grain of rice and can approximately beat 160 times a minute

Examination of the four chambers of the heart and in colour the characteristics of the circulation

 ADDOMEN at 12 weeks

 

 

 

 

 

 

 

 

 

 

 

Visualization of the kidney (5mm) and its artery (0.6mm).

  

ADDOMEN at 12 weeks

   

 

 

 

 

 

 

 

 

 

Visualization of the long bones of the hands and legs: the little finger is 0.5 mm long

 

 

 

Last Edit: 2013-08-05 19:56:40