The document discusses femoral hernias, which occur when abdominal contents pass through the femoral canal, the third most common type of hernia. Femoral hernias are more common in elderly women and have a high risk of strangulation. The document describes the anatomy of the femoral canal and ring and lists different types of femoral hernias, including Laugier's, Narath's, and Cloquet's hernias. It emphasizes the importance of operating on femoral hernias as soon as diagnosed due to the risk of strangulation and notes that trusses are contraindicated for treatment.