Peripheral Nerve Injury Structure and Classification

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18 Questions

Which type of nerve injury is characterized by a complete or partial failure to propagate an action potential along the nerve?

Neurapraxia

What is the main difference between neurapraxia and axonotmesis?

The disruption of the axon and myelin sheath

In neurapraxia, what allows for a potential recovery of motor function?

Re-myelination of the distal segment

Which part of the nerve remains intact in axonotmesis injuries?

Schwann cells

What is the characteristic feature of neurapraxia in terms of time to recovery?

Recovery by re-myelination in 2-12 weeks

Which type of nerve injury is usually caused by severe compression or crush?

Axonotmesis

What is the most common ulnar nerve impingement location?

In Guyon's canal

Which nerve lesion is characterized by a hand in ulnar claw position?

Ulnar nerve lesion

What symptom is associated with femoral nerve lesion?

Pain in the inguinal region

Which nerve lesion is characterized by a high-stepping walk and foot drop?

Peroneal nerve lesion

What is a common cause of obturator nerve lesion?

Pelvic trauma

Which syndrome is associated with diffuse heel pain that worsens throughout the day?

Tarsal tunnel syndrome

What is another name for a brachial plexus lesion causing 'porters tip'?

Klumpke Palsy

What muscles are affected in a lesion involving the brachial plexus?

Adductors of the shoulder

Which nerve is usually involved in Klumpke’s palsy?

Ulnar nerve

What is a characteristic symptom of Klumpke’s palsy?

Weakness in finger abduction

What is a common cause of Klumpke Palsy?

Excessive abduction of the arm

Which symptom is often associated with Klumpke's palsy due to traction of sympathetic fibers?

Ptosis (drooping of upper eyelid)

Explore the structure and classification of peripheral nerve injuries including cranial and spinal nerves, efferent and afferent axons, myelinated and nonmyelinated fibers, and different types of nerve injuries. Learn about the components of peripheral nerves such as epineurium, perineurium, and endoneurium.

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