The intrinsic vascularization of human peripheral nerves: structural and functional aspects

Area of Science:

• Neuroscience
• Vascular Biology
• Anatomy

Background:

• Understanding the microvascular architecture of human peripheral nerves is crucial for surgical interventions.
• Previous studies often relied on animal models, necessitating direct human nerve analysis.

Purpose of the Study:

• To analyze the intrinsic microvascular system of human peripheral nerves.
• To investigate the vascularization of perineurial and intrafascicular compartments.
• To assess the impact of intraneural dissection on nerve microvasculature and blood flow.

Main Methods:

• Combined microangiographic and histological techniques applied to human peripheral nerves from amputated arms.
• Detailed examination of epineurial, perineurial, and endoneurial vascular networks.

Main Results:

• Human peripheral nerves exhibit a microvascular system analogous to experimental animals.
• Fascicles are segmentally vascularized by epineurial vessels.
• A distinct fascicular vascular organization exists, integrating endoneurial and perineurial microvascular systems.
• Intraneural dissection induces significant nerve trauma and extrafascicular inflammation.

Conclusions:

• The perineurium acts as a barrier, potentially limiting the impact of dissection-induced inflammation on intrafascicular tissues.
• Surgical procedures involving intraneural dissection may cause localized trauma but preserve intrafascicular vascular integrity to some extent.