Morphometric comparison between contralateral sciatic nerves in the male and female rabbit

Area of Science:

• Neuroscience
• Comparative Anatomy
• Morphometrics

Background:

• The sciatic nerve is crucial for motor and sensory function in the hindlimb.
• Understanding its morphometrical parameters is essential for diagnosing and treating neurological conditions.

Purpose of the Study:

• To compare morphometrical parameters of axons in contralateral sciatic nerves of male and female rabbits.
• To investigate potential sex-based and side-based variations in nerve fiber characteristics.

Main Methods:

• Utilized a Zeiss Vidas image analyzer for quantitative analysis.
• Calculated and compared morphometrical parameters including fiber diameter, density, G ratio, and unmyelinated axon diameter.

Main Results:

• Left sciatic nerves exhibited greater mean fiber diameter but lower mean fiber density compared to right nerves.
• No significant sex-based differences were observed in myelinated fiber diameter or overall fiber density.
• Right sciatic nerves showed higher average G ratio and unmyelinated axon diameter in both sexes.

Conclusions:

• Sciatic nerve morphology demonstrates asymmetry between the left and right sides in rabbits.
• Axon diameter and fiber density variations are side-dependent, not sex-dependent.
• The G ratio and unmyelinated axon diameter are key indicators of this observed sciatic nerve asymmetry.