A quick and accurate line-sampling technique to quantify myelinated axons in peripheral nerve cross-sections

Area of Science:

• Neuroscience
• Histology
• Biomedical Engineering

Background:

• Accurate quantification of myelinated axons is crucial for assessing peripheral nerve health and regeneration.
• Traditional methods for axon counting are often time-consuming and labor-intensive, involving manual counting or photography.

Purpose of the Study:

• To develop and validate a rapid, computer-assisted method for quantifying myelinated axons in peripheral nerve cross-sections.
• To reduce the time and labor required for axon counting in both normal and experimental nerve samples.

Main Methods:

• Utilized an IBM-PC with custom quantitation software and a light microscope with a camera lucida attachment.
• Employed a line-sampling technique for estimating axon counts in sciatic nerve cross-sections.
• Compared estimated counts to actual total counts across nine nerve samples with varying diameters and axon densities.

Main Results:

• The computer-assisted method accurately quantified myelinated axons in peripheral nerve cross-sections.
• The line-sampling technique provided estimates that varied by up to 15% compared to total counts.
• The developed method significantly reduced the time required for axon quantification, completing counts in approximately fifteen minutes.

Conclusions:

• The described computer-assisted method offers a quick and accurate approach for quantifying myelinated axons.
• This technique is applicable to normal, experimental, and regenerated peripheral nerves, saving time by eliminating photography and manual total counts.