Lege Artis Medicinae

[Transvaginal ultrasound examination of embryo development in early pregnancy (sono-embryology) II. central nervous system]

CSABAY László1, SZABÓ István1, NÉMET János1, PAPP Zoltán1

JUNE 30, 1992

Lege Artis Medicinae - 1992;2(06)

[In the second part of their paper, the authors look over the most important phases of the development of the central nervous system during the first trimester of pregnancy - especially considering the stages, which can be differentiated with a high resolution transvaginal transducer. The closed neural tube is developing at days 40 to 44 by the closure of the posterior neuropore, however at this time no brain structures can be detected by ultrasound. During the 7th week the three primary brain vesicles (prosencephalon, metencepha lon, myelencephalon) can be identified – a single ventricle can be seen by ultrasound. During the 8th week the secondary brain vesicles (telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon) can be separated. During the 9th week the lateral ventricles are filled out by the choroid plexus, which are retracted to the occipital horn by the 13th week. The appearance of the brain structures also takes place according to an accurate „calendar". The structures recognized by ultrasound can be compared to those of the central nervous system known from embryology. The problem of the primary prevention of the cerebrospinal malformations, which are among the most frequent congenital disorders, is not yet solved; therefore the early prenatal diagnosis of the structural anomalies has great importance. ]

AFFILIATIONS

  1. Semmelweis Orvostudományi Egyetem I. Szülészeti és Nőgyógyászati Klinika

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