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Asynchronous changes in size, number, and shape of synapses in the developing superior colliculus

E M Correa-Gillieron¹, L A Cavalcante

¹Instituto de Biofisica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil.

International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience

|February 1, 1997

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Synaptic development in opossum superior colliculus showed changes in disk diameter and synapse shape. Multiple factors likely influence this complex synaptic maturation process.

Area of Science:

Neuroscience
Developmental Biology
Cell Biology

Background:

The superior colliculus is a key brain region for visual processing.
Understanding synaptic development is crucial for comprehending neural circuit formation.
The opossum provides a valuable model for studying mammalian brain development.

Purpose of the Study:

To investigate the ultra-structural development of synapses in the retino-receptive layers of the opossum superior colliculus.
To characterize changes in synaptic morphology and density during development.

Main Methods:

Utilized the ethanolic phosphotungstic acid (E-PTA) staining method for ultra-structural analysis.
Examined synaptic disks, numerical densities, and the proportion of different synapse shapes (curve synapses).

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Main Results:

Observed a tendency for reduced synaptic disk diameter.
Noted fluctuations in the numerical densities of synapses.
Found a general increase in the proportion of "frown" curve synapses, with a temporary exception.
Highlighted the lack of strict synchrony in developmental changes.

Conclusions:

Synaptic maturation in this brain region is a complex process.
Multiple, potentially asynchronous factors contribute to synaptic development.
The observed changes suggest dynamic remodeling of synaptic structures.