Perineurium

Perineurium is a layer of tissue that surrounds a nerve bundle. It is part of the peripheral nervous system and plays a crucial role in maintaining the blood-nerve barrier. The perineurium is composed of perineurial cells, which are specialized fibroblasts that have a high degree of plasticity and can change their shape and function in response to injury or disease.

Structure

The perineurium is a sheath of connective tissue that surrounds a bundle of nerve fibers, known as a fascicle. It is composed of several layers of flattened perineurial cells, which are connected by tight junctions and form a barrier to the diffusion of substances from the blood into the nerve. The perineurium also contains a network of capillary vessels, which supply the nerve fibers with nutrients and oxygen.

Function

The main function of the perineurium is to maintain the blood-nerve barrier, which protects the nerve fibers from harmful substances in the blood. It also provides mechanical support and protection to the nerve fibers, and helps to regulate the internal environment of the nerve by controlling the exchange of substances between the nerve and the blood.

Clinical significance

Damage to the perineurium can lead to a breakdown of the blood-nerve barrier, which can result in neuropathy or other neurological disorders. In addition, perineurial cells have been found to play a role in the response to nerve injury and in the process of nerve regeneration.

See also

• Epineurium
• Endoneurium
• Nerve

References

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