Peripheral Nerve Injury Classification Flashcards

Questions and Answers

What is the definition of 1st degree peripheral nerve injury?

Axon is severed, but the endoneurium is intact

Loss of axon, endoneurium, perineurium and fasciculi, but epineurium intact

Complete disruption of the nerve trunk

Local myelin damage usually secondary to compression (correct)

What does 2nd degree peripheral nerve injury mean?

Axon and endoneurial tube discontinuity

Seddon name for 1st degree nerve injury

Axon is severed, but the endoneurium is intact (correct)

Complete disruption of the nerve trunk

What describes a 3rd degree peripheral nerve injury?

Local myelin damage usually secondary to compression

Seddon name for 2nd-4th degree nerve injury

Complete disruption of the nerve trunk

Loss of axon and endoneurial tube discontinuity, but perineurium and fasciculi intact (correct)

How is a 4th degree peripheral nerve injury characterized?

Loss of axon, endoneurium, perineurium and fasciculi, but epineurium intact Signup and view all the answers

What does 5th degree peripheral nerve injury represent?

Complete disruption of the nerve trunk Signup and view all the answers

What is the Seddon name for 1st degree nerve injury?

Neurapraxia Signup and view all the answers

What is the Seddon name for 2nd-4th degree nerve injury?

Axonotmesis Signup and view all the answers

What is the Seddon name for 5th degree nerve injury?

Neurotmesis Signup and view all the answers

Study Notes

Peripheral Nerve Injury Classification

Five degrees of nerve injury classification exist, each representing varying levels of damage.

1st Degree Nerve Injury (Neurapraxia)

Characterized by local myelin damage, typically resulting from compression.
Functionally intact nerve fibers; recovery is usually rapid and complete.

2nd Degree Nerve Injury (Axonotmesis)

Involves the severing of the axon while the endoneurium remains intact.
Potential for recovery through regeneration of the axon.

3rd Degree Nerve Injury

Features both axonal and endoneurial tube discontinuity, but perineurium and fasciculi stay intact.
Regeneration is challenging but possible; functional recovery may be hindered.

4th Degree Nerve Injury

Loss encompasses axon, endoneurium, perineurium, and fasciculi, while the epineurium remains intact.
Severe complications arise for recovery; surgical intervention may be required.

5th Degree Nerve Injury (Neurotmesis)

Represents complete disruption of the nerve trunk.
Typically leads to significant functional loss, and surgical repair is necessary for potential recovery.

Terminology

Neurapraxia: Seddon term for 1st-degree injuries, indicating temporary loss of function without anatomical disruption.
Axonotmesis: Refers collectively to 2nd through 4th degree injuries according to Seddon's classification.
Neurotmesis: Seddon's term for 5th-degree injury, indicating the most severe form with total loss of nerve continuity.

Description

Test your knowledge on the classification of peripheral nerve injuries with these flashcards. Each card presents a degree of injury along with a concise definition, helping you understand local myelin damage to complete loss structures. Perfect for students and professionals in neuroscience and medicine.