MR imaging of the developing human brain. Part 1. Prenatal development

Area of Science:

• Embryology
• Neuroscience
• Medical Imaging

Background:

• Establishing a baseline for fetal brain development is crucial for understanding normal and abnormal intrauterine growth.
• Magnetic resonance (MR) imaging offers high-resolution visualization of soft tissues, making it suitable for detailed anatomical studies.

Purpose of the Study:

• To establish a baseline of magnetic resonance (MR) imaging appearance of the developing fetal brain between 6 and 28 weeks of gestational age.
• To assess the feasibility of using MR imaging for detailed evaluation of fetal anatomy during early development.

Main Methods:

• A study was conducted on fixed and fresh specimens of human embryos and fetuses ranging from 6 to 28 weeks gestational age.
• Magnetic resonance (MR) imaging was performed on formalin-preserved and fresh specimens to compare image quality and anatomical detail.

Main Results:

• MR images of formalin-preserved and fresh specimens showed comparable depiction of anatomical structures.
• Key brain structures, including the rhombic and cervical flexures, aqueduct of Sylvius, diencephalon, cerebellum, cerebral hemisphere, and fourth ventricle, were identifiable as early as 6 weeks gestation.
• Further structures like the optic recess, pituitary gland, corpus striatum, and cerebral lobes were distinguished by 11 weeks gestation.

Conclusions:

• MR imaging is a valuable tool for detailed visualization of early fetal brain development.
• While not practical for routine screening, MR imaging can provide specific anatomical evaluations, potentially aiding in establishing developmental assessment guidelines.