Ultrastructural morphology and morphometry of phrenic nerve in rats

Area of Science:

• Neuroscience
• Anatomy
• Histology

Background:

• Previous research focused on myelinated fibers in rat phrenic nerves.
• A systematic analysis of unmyelinated fiber morphometry and symmetry was lacking.

Purpose of the Study:

• To investigate the longitudinal and lateral symmetry of unmyelinated nerve fiber morphometry in adult rats.
• To provide detailed ultrastructural and morphometric data on the phrenic nerve.

Main Methods:

• Adult male Wistar rats' phrenic nerves were examined using transmission electron microscopy.
• Morphometric analysis included unmyelinated fiber number, density, area, diameter, and ratios with myelinated fibers.
• Data were compared between proximal and distal segments, and across left and right sides.

Main Results:

• Key morphometric parameters of unmyelinated phrenic nerve fibers demonstrated significant longitudinal and lateral symmetry in adult rats.
• No significant differences were observed between proximal and distal segments or between the left and right sides.

Conclusions:

• The morphometry of unmyelinated phrenic nerve fibers in adult rats is consistent along the nerve length and across both sides of the body.
• This study establishes a baseline for understanding phrenic nerve unmyelinated fiber morphology and its symmetry.