Sectional And Imaging Anatomical Research In Abdominal And Pelvic Part Of A Pregnant Woman Cadaver In Third Trimester

Background: Ever since a long time ago, sectional and imaging anatomiacal research of pregnant woman had been focused on living imaging examination, because the specimen was hard to get.For the pregnant woman at term, the location of abdominal and pelvic organs had been changed complicatedly and physiologically. Many obstetrical diseases occurred in this period, so the pregnant woman at term should be monitored rigorously in clinic. The B-mode ultrasonography could demonstrate some organs clearly, but because of its weak penetrating power, the pelvis and organs containing gas were difficult to be detected. So the complete sectional images of female pelvic part were hard to be obtained. Magnetic resonance as an examination method in clinic having no radiation damage, were paid close attention to by obstetricians, mainly used in the second and third trimester.The two diagnostic techniques above were based on sectional anatomy. So it was urgent to get the sectional anatomiacal data of pregnant woman in abdominal and pelvic part, providing morphological data for imaging examination of pregnant woman.Ma Yiling, Jiang Junben, Han Jingru used two pregnant women cadavers whose fetal heads had descended in pelvic canal to make successive transverse sectional specimens in abdominal and pelvic part of pregnant women in third trimester, which had some practical significance for imaging examination of pregnant women. in third trimester. But this research was only in transverse sections, and had no intimate comparisons between sectional specimens and MRI.So it was necessary to have the transverse , sagittal and coronal sectional research of pregnant womam.Our study chose a healthy and young pregnant woman cadaver in third trimester, which han been sanned by CT and MRI and had oriental characteristics.Objective: To provide sectional anatomic data for allelotaxy of term fetus and B-ultrasound and MRI diagnosis in abdominal and pelvic part of pregnant women in third trimester.Materials and Method: After MRI and CT scanning in abdominal and pelvic part of the pregnant woman cadaver in third trimester, the abdominal and pelvic part was incided into serial sagittal 10-millimeter thick sections which have equal appearing interval and were parallel to the median sagittal plane by dynamoelectric beltsaw.Result: (1) The successive transverse , sagittal and coronal sectional description of pregnant woman cadaver in third trimester. (2) Comparing with normal unpregnant women, we analyzed the locational aversion of some organs and structures of pregnant woman in abdominal and pelvic part. Pushed by the gravid uterus, the location of some organs and structures moved top-left. (3) The corresponding sectional relationship between fetal main organs and maternal vertebraes. Fetal kidneys appeared in the section of the third maternal lumbar vertebrae, fetal adrenal gland in the section of the third maternal intervertebral disk, fetal liver between the sections of the third maternal lumbar vertebrae and that of the fouth maternal intervertebral disk, fetal heart between the sections of the fouth maternal intervertebral disk and that of the fifth maternal lumbar vertebrae, fetal brain between the sections of the third maternal sacral vertebrae and that of pubic symphysis, fetal cerebellum in the section of the third maternal sacral vertebrae, fetal lung between the sections of the fouth maternal lumbar vertebrae and that of the fifth, the placenta between the section of the second maternal lumbar vertebrae and that of the third maternal sacral vertebrae. (4) The comparison of fetal structures between specimen and MRI. The main fetal structures can be also seen in MRI.Conclusion: The analytic results of the MR,CT and serial sagittal sectional images of cadaver can provide normal and useful anatomic data for allelotaxy of term fetus and B- ultrasound and MRI diagnosis in abdominal and pelvic part of pregnant women in third trimester.