Fetal head axial plane

From the midsagittal plane, the transducer is rotated 90 degrees to get the axial planes of the fetal head, ideally imaged from the lateral aspects. Similar to the approach in the second trimester, four axial planes of the fetal head in the first trimester allow for a comprehensive evaluation of CNS anatomy. These planes include the axial plane at the level of the lateral ventricles, the axial plane at the level of the thalami, the axial-oblique plane at the level of the cerebellum and posterior fossa, and the axial plane at the level of the orbits.

Section Structure

1. Oval head shape
2. Skull bones
3. Falx cerebri
4. Choroid plexus
5. Lateral ventricles
6. Third ventricles
7. Cortex

Section Structure

1. Skull bones
2. Falx cerebri
3. Lateral ventricles
4. Third ventricles
5. Thalami
6. Aqueduct of Sylvius
7. Cerebral peduncles

Section Structure

1. Thalami
2. Developing cerebellum
3. Fourth ventricle
4. Choroid plexus of fourth ventricle
5. Cisterna magna

Section Structure

1. Eyes/Orbit
2. Maxillary processes
3. Nose