Labyrinth of ethmoid

Labyrinth of Ethmoid

The Labyrinth of Ethmoid or Ethmoidal Labyrinth is a complex structure located within the Ethmoid bone in the skull. It is a significant component of the paranasal sinuses, which are air-filled spaces around the nasal cavity.

Structure[edit | edit source]

The Labyrinth of Ethmoid consists of a number of thin-walled Ethmoid air cells that form the bulk of the ethmoid bone. These cells are divided into anterior, middle, and posterior groups, and are separated from each other by thin bony septa. The ethmoidal labyrinth is located between the orbital cavity and the upper nasal cavity, and is enclosed by the ethmoid bone.

Lateral wall of nasal cavity, showing ethmoid bone in position.

Function[edit | edit source]

The primary function of the Labyrinth of Ethmoid is to lighten the weight of the skull and provide resonance to the voice. The ethmoid air cells also contribute to the process of warming and humidifying inhaled air before it reaches the lungs.

Clinical significance[edit | edit source]

Due to its location and structure, the Labyrinth of Ethmoid is often involved in sinus infections, known as sinusitis. In severe cases, these infections can spread to the surrounding structures, including the eyes and brain, leading to serious complications such as orbital cellulitis and meningitis.