Equine Guttural Pouch Diseases Study Guide

Overview and Clinical Importance

The guttural pouches are paired diverticula of the auditory (Eustachian) tubes unique to equids. Each pouch has a capacity of approximately 300-500 mL and is lined with pseudostratified ciliated epithelium containing goblet cells. The stylohyoid bone divides each pouch into a larger medial compartment and smaller lateral compartment. The intimate association of the guttural pouches with major vascular structures and cranial nerves makes diseases of these structures clinically significant and potentially life-threatening.

Guttural Pouch Anatomy

Understanding the complex anatomy of the guttural pouch is essential for interpreting clinical signs and avoiding iatrogenic injury during treatment. The guttural pouches are located behind the cranial cavity, caudal to the skull, and below the wings of the atlas (C1).

Key Anatomical Structures

Guttural Pouch Empyema

Etiology and Pathophysiology

Guttural pouch empyema is the accumulation of purulent material within one or both guttural pouches. The most common cause is Streptococcus equi subspecies equi (strangles), which accounts for the majority of cases. The infection typically develops when retropharyngeal lymph nodes abscess and rupture into the ipsilateral guttural pouch, or through direct extension from upper respiratory tract infections.