Fetal Brain & CNS

1. Midline brain cavity whose lateral walls are formed by the thalami and hypothalamus: ______ ventricle.
4. Lethal developmental defect characterized by the complete or partial absence of the cranial vault with exposed brain tissue.
7. Ventricle situated anterior to the cerebellum and posterior to the pons and medulla oblongata: ______ ventricle.
8. Developmental region originating from the embryonic rhombencephalon, comprising the cerebellum, pons, and medulla oblongata.
10. Abnormal dilation of the fetal cerebral ventricular system without significant parenchymal compression or increased pressure.
12. The most severe form of holoprosencephaly, characterized by a monoventricle and complete failure of hemispheric division.
14. Embryonic brain division connecting the pons and cerebellum with the cerebral hemispheres, also known as the midbrain.
15. Brainstem structure situated anterior to the cerebellum, connecting the midbrain above with the medulla oblongata below.
16. Complex forebrain malformation resulting from incomplete cleavage of the prosencephalon into two distinct cerebral hemispheres.

2. Ventriculomegaly accompanied by increased intraventricular pressure and progressive compression of surrounding cerebral tissue.
3. Cerebellar sign characterized by a curved effaced structure tightly wrapping around the brainstem in Arnold-Chiari II malformation.
5. Normal physiological cystic hindbrain structure routinely visualized in the early embryonic brain between 8 and 11 weeks.
6. Anatomic region of the lateral ventricle where the body, occipital horn, and temporal horn converge: ventricular ______.
9. Rare brain malformation characterized by a smooth cerebral cortex due to absent or decreased sulcal formation.
11. Symmetrical paired gray matter structure forming the largest part of the diencephalon, serving as a landmark for BPD measurements.
13. Cranial shape abnormality characterized by flattening or scalloping of the frontal bones, classic for spina bifida: ______ sign.