Long-term, high-resolution imaging in the neocortex in vivo

Area of Science:

• Neuroscience
• Cell Biology
• Microscopy

Background:

• Understanding structural plasticity in the neocortex is crucial for cognitive functions like memory.
• Time-lapse imaging reveals dynamic dendritic activities in developing and adult cortical tissues.
• High-resolution in vivo imaging of neuronal structure is essential for studying these dynamics.

Purpose of the Study:

• To describe experimental procedures for in vivo imaging in the neocortex using two-photon laser scanning microscopy (2PLSM).
• To highlight the advantages of 2PLSM for studying neuronal structure and plasticity.

Main Methods:

• Utilizes two-photon laser scanning microscopy (2PLSM) for imaging.
• Employs near-simultaneous absorption of two photons by a fluorophore, confined to a small focal volume.
• Leverages longer wavelengths for efficient penetration of scattering tissues.

Main Results:

• 2PLSM allows for chronic, high-resolution, in vivo imaging of cortical neuron structure.
• The technique confines signal generation to the focal volume, maximizing signal utility.
• Longer wavelengths used in 2PLSM improve tissue penetration compared to single-photon methods.

Conclusions:

• 2PLSM is a powerful tool for investigating structural plasticity in the neocortex.
• The described protocol facilitates in vivo imaging of neuronal dynamics.
• This imaging capability is vital for understanding network properties and cognitive phenomena.