Canine Peripheral Neuropathy Study Guide

Overview and Clinical Importance

Peripheral neuropathy refers to disorders affecting the peripheral nervous system (PNS), which includes all nerves outside the brain and spinal cord. These conditions cause dysfunction of motor, sensory, and/or autonomic nerve fibers, resulting in weakness, ataxia, decreased reflexes, and muscle atrophy. Peripheral neuropathies represent a significant category of neurological disease in canine medicine and are frequently tested on the NAVLE due to their clinical importance and diagnostic complexity.

The peripheral nervous system connects the central nervous system to muscles, organs, and sensory receptors throughout the body. Dysfunction can occur at the level of the nerve cell body (neuronopathy), the axon (axonopathy), the myelin sheath (demyelinating neuropathy), or at the neuromuscular junction. Understanding the anatomical and pathophysiological basis of peripheral neuropathies is essential for accurate diagnosis and management.

Anatomy and Pathophysiology

Peripheral Nervous System Structure

The peripheral nervous system consists of cranial nerves (12 pairs), spinal nerves (36 pairs in dogs: 8 cervical, 13 thoracic, 7 lumbar, 3 sacral, and 5-7 caudal), and the autonomic nervous system (sympathetic and parasympathetic components).