What forms the ventral boundary of Viborg's Triangle?

What forms the ventral boundary of Viborg's Triangle?

• A. Linguofacial vein
• B. Lingual artery
• C. Facial nerve
• D. External jugular vein

Answer: (A)

Viborg's triangle is a superficial neck landmark used in veterinary practice to access the jugular vein while avoiding deeper structures. Its ventral boundary is defined by a prominent venous channel that runs along the ventral neck—the linguofacial vein. This vein forms a clear, consistent edge you can feel or see on the underside of the neck, helping orient the clinician to a safe puncture site. The lingual artery lies deeper and more medial, the facial nerve travels in the parotid region rather than forming a ventral edge, and the external jugular vein runs laterally rather than along the ventral border, so they do not define this boundary.

Viborg's triangle is a superficial neck landmark used in veterinary practice to access the jugular vein while avoiding deeper structures. Its ventral boundary is defined by a prominent venous channel that runs along the ventral neck—the linguofacial vein. This vein forms a clear, consistent edge you can feel or see on the underside of the neck, helping orient the clinician to a safe puncture site. The lingual artery lies deeper and more medial, the facial nerve travels in the parotid region rather than forming a ventral edge, and the external jugular vein runs laterally rather than along the ventral border, so they do not define this boundary.