Ethmoid Veins Anterior and Posterior

The ethmoid veins anterior and posterior (v. ethmoidales anterior et posterior, BNA; ethmoideae anterior et posterior, JNA) are paired veins of the head that drain blood from the ethmoid bone.

The anterior ethmoid vein drains blood from the anterior parts of the ethmoid bone and flows into the superior ophthalmic vein.

The posterior ethmoid vein drains blood from the posterior parts of the ethmoid bone and flows into the maxillary vein.

These veins are part of the venous drainage system from the nose and paranasal sinuses. They play an important role in draining venous blood from the ethmoid bone into the superior vena cava basin.

The ethmoid veins of the anterior and posterior walls provide the outflow of venous blood from the tissues of the skull, nose, ethmoid bone and orbit. The veins pass through the ethmoidal openings into the ethmoidal labyrinth, where they connect with other veins and eventually enter the cavernous sinus. The anterior part of the ethmoid veins connects with others and flows into the angle and ethmoid sinus, forming the nasal vein. The posterior part of the ethmoidal vein connects with the lacrimal fossa, which flows into the round vein.

Anatomical features

The foramen ethmoid veins are among the most important veins in the skull due to their role in the circulation of the head. They ensure the outflow of blood from the nasal cavity, ethmoid labyrinth, orbit, as well as directly from the tissues themselves. Venous blood enters the anterior and posterior ethmoid veins, located on the sides of the nasal septum. These veins combine to form the nasal vein, which drains into the posterior inferior orbit and then into the venous portion of the cavernous sinus.

*The nasal vein* is the main vein arising from the anterior and posterior ethmoid bones, the branches of which form venous canals and cover various tissues. The total area of ​​blood flow of the anterior nasal veins is about 9.6 mm³, the posterior nasal branches is about 4.5 mm³/min.

Based on these data, each vein of the ethmoidal foramen has an important role in human blood circulation. The ethmoid veins play a huge role in blood circulation even after a sharp increase in pressure

The ethmoid veins are represented by the anterior and posterior ethmoid veins. Each of them connects the venous bed of the tunica media with the orbit, then flows into the cavernous sinus. They have their own names: front and back. Basic information about their structure and functions. The anterior ethmoid vein (ATV) is formed by the fusion of the lateral veins of the nasal cavity, superior labial, inferior nasal, anterior