Arteria ethmoidalis

Arteria Ethmoidalis refers to a set of arteries supplying blood to the ethmoidal cells and the dura mater in the cranial area. These arteries are crucial components of the anatomy of the nasal cavity and the surrounding structures. They are primarily categorized into anterior and posterior ethmoidal arteries, which are branches of the ophthalmic artery, itself a branch of the internal carotid artery.

Anatomy

The arteria ethmoidalis is divided into two main branches:

Anterior Ethmoidal Artery

The Anterior Ethmoidal Artery originates from the ophthalmic artery as it crosses the medial wall of the orbit. It then travels through a small canal, the anterior ethmoidal canal, to reach the cranial cavity. Here, it supplies the anterior ethmoidal cells, the frontal sinus, and parts of the dura mater. It also gives off a nasal branch that contributes to the supply of the anterior part of the nasal septum and lateral wall of the nasal cavity.

Posterior Ethmoidal Artery

The Posterior Ethmoidal Artery is smaller than its anterior counterpart. It also arises from the ophthalmic artery and enters the cranial cavity through the posterior ethmoidal canal. It supplies the posterior ethmoidal cells and parts of the sphenoidal sinuses. Similar to the anterior artery, it also has branches that supply the dura mater.

Clinical Significance

The arteria ethmoidalis, especially its anterior branch, is of significant clinical importance due to its involvement in epistaxis (nosebleeds). Damage to this artery during sinus surgery or because of trauma can lead to severe bleeding. Its anatomical relationship with the orbit and the ethmoidal cells makes it a landmark in various surgical procedures.

See Also

• Ophthalmic Artery
• Internal Carotid Artery
• Nasal Cavity
• Dura Mater
• Sinus Surgery