[Features of human cortical pyramidal neurons development during second gestational trimester]

Area of Science:

• Neuroscience
• Developmental Biology
• Human Embryology

Context:

• Human neocortex development presents unique characteristics.
• Animal model data is not easily extrapolated to human corticogenesis.
• Focus on prenatal development during the middle and late gestational periods.

Purpose:

• Investigate the developmental features of human cortical pyramidal neurons.
• Determine the timeline of neuronal differentiation between 16-26 gestational weeks.
• Identify critical developmental windows for neuronal populations.

Summary:

• Utilized indirect immunofluorescence with microtubule-associated protein 2 (MAP2) antibodies to mark dendrogenesis.
• MAP2-positive neurons identified in layer V by 18 weeks and layer III by 25 weeks.
• Two distinct pyramidal neuron populations observed in the cortical plate at 25 weeks.

Impact:

• Findings suggest distinct critical periods for cortico-cortical and corticofugal pyramidal cell populations.
• Highlights the vulnerability of differentiating neurons to damaging factors.
• Provides crucial insights into the timing of human neocortical development.