Related Experiment Videos
Neuronal development of the chick cerebral cortex. A Golgi study
Journal Fur Hirnforschung
|January 1, 1986
Summary
Avian telencephalic cortex development reveals distinct neuronal types and morphological changes from embryonic stages to newborn chicks. Immature neurons exhibit unique features like growth cones, which disappear post-hatching.
Area of Science:
- Neuroscience
- Developmental Biology
- Comparative Anatomy
Background:
- The avian telencephalic cortex (DMC) is a crucial region for cognitive functions.
- Understanding neuronal development is key to deciphering brain evolution and function.
Purpose of the Study:
- To investigate the morphological development of neuronal types in the avian telencephalic cortex.
- To identify and characterize neuronal morphologies at different embryonic and post-hatch stages.
Main Methods:
- Golgi staining technique for visualizing neuronal morphology.
- Microscopic examination of brain sections from embryonic days 10, 13, 16, and newborn chicks.
Main Results:
- Immature neurons display hair-like processes, growth cones, and dendritic varicosities.
- These immature features are absent in newborn chick neurons.
- Five differentiation patterns yield six distinct neuronal types in newborn chicks: horizontal, pyramidal, bipyramidal, short axon multipolar, long axon multipolar, and periventricular neurons.
- Dendritic spines emerge in most neuronal types by embryonic day 16.
- Morphological characteristics of migrating embryonic cells were documented.
Conclusions:
- The study elucidates the dynamic morphological transformations during avian telencephalic cortex development.
- Distinct neuronal subtypes with specialized morphologies are established by the time of hatching.
- The findings provide insights into the cellular basis of avian brain development and evolution.