Final answer:
The ethmoid air cells, part of the ethmoid bone, are located in the anterior part of the medial wall of the orbits, between the labyrinth of the ethmoid and the maxilla.
Step-by-step explanation:
The anterior part of the medial wall of the orbits, located between the labyrinth of the ethmoid bone and the maxilla, primarily features the ethmoid air cells. These air cells are part of the ethmoid bone and contribute to the paranasal sinus system, which includes air-filled spaces within several skull bones. Specifically, the ethmoid air cells are multiple small spaces situated in the ethmoid bone that contribute to the medial wall of the orbit and the lateral wall of the upper nasal cavity.
Additionally, the lacrimal bone and its associated structures, such the lacrimal fossa and nasolacrimal canal, are part of the anterior, medial wall of the orbit as well. It also contains the ethmoid air cells, which are small, air-filled spaces within the bone that are part of the paranasal sinus system of the skull.