The apex of the maxillary sinus faces the:

 # The apex of the maxillary sinus faces the:

A. Nasal bone

B. Floor of the orbit

C. Palate

D. Zygomatic process of the maxilla

The apex of the maxillary sinus faces the D. Zygomatic process of the maxilla.

Anatomical Explanation
The maxillary sinus (also known as the Antrum of Highmore) is the largest of the paranasal sinuses and is roughly shaped like a pyramid lying on its side. Its orientation is as follows:

• Apex: Points laterally towards the zygomatic process of the maxilla. In some individuals, it may even extend into the zygomatic bone.
• Base: Faces medially and is formed by the lateral wall of the nose.
• Roof: Formed by the floor of the orbit (containing the infraorbital nerve and vessels).
• Floor: Formed by the alveolar process of the maxilla (often very close to the roots of the molar and premolar teeth).

Summary of Incorrect Options
A. Nasal bone: This area relates to the medial wall (base) of the sinus, not the apex.
B. Floor of the orbit: This forms the superior wall (roof) of the sinus.
C. Palate: This relates to the inferior aspect; the hard palate and alveolar process form the floor of the sinus.