Bovine Traumatic Nervous System Injuries – NAVLE Study Guide

Overview and Clinical Importance

Traumatic nervous system injuries represent a significant cause of morbidity, mortality, and economic loss in cattle production. These injuries encompass damage to the spinal cord, peripheral nerves, and brain resulting from mechanical trauma. The periparturient period is a particularly high-risk time for cattle, with calving paralysis being one of the most commonly encountered traumatic nerve conditions. Understanding the neuroanatomy, clinical presentation, diagnosis, and management of these injuries is essential for NAVLE success and clinical practice.

Traumatic nervous system injuries in cattle most commonly result from: dystocia and calving-related injuries, mounting behavior during estrus, falls and handling accidents, prolonged recumbency (downer cow syndrome), and improper restraint during procedures. Early recognition and intervention are critical, as delays beyond 6 hours significantly worsen prognosis due to secondary muscle and nerve damage.

Neuroanatomical Foundations

Spinal Cord Segments and Function

The bovine spinal cord is divided into functional regions that correspond to the innervation of specific body areas. Cattle have 7 cervical vertebrae (C1-C7), 13 thoracic vertebrae (T1-T13), 6 lumbar vertebrae (L1-L6), and 5 fused sacral vertebrae (S1-S5). Understanding these segments is crucial for lesion localization.