**Question:** Not true regarding inferior walls of orbit

A. The inferior walls are part of the lacrimal fossa
B. The inferior walls are formed by the zygomatic process of the frontal bone
C. The inferior walls are involved in the formation of the lacrimal gland
D. The inferior walls are not related to the superior orbital fissure

**Correct Answer: D.**

**Core Concept:** Orbit is a bony cavity that houses the eye and its surrounding structures. The walls of the orbit are formed by various bones and their processes, and they play a crucial role in protecting the eye and facilitating its movement.

**Why the Correct Answer is Right:** The inferior walls of the orbit are formed by the inferior orbital rim and the orbital floor. They provide support and protect the eye from trauma, while also allowing for its downward movement. The inferior walls are not involved in the formation of the lacrimal gland or the lacrimal fossa (option C and A).

**Why Each Wrong Option is Incorrect:**

**Option A:** The lacrimal fossa is located inferior to the orbit and contains the lacrimal gland. It is separate from the inferior walls of the orbit and is formed by the lacrimal bone and the inferior border of the orbit.

**Option B:** The zygomatic process of the frontal bone contributes to the superior orbital rim but not the inferior walls of the orbit. The inferior walls are formed by the inferior orbital rim and orbital floor.

**Option C:** The inferior walls are not involved in the formation of the lacrimal gland, which is formed by the lacrimal bone and the inferior border of the orbit.

**Option D:** This option highlights the main point being tested - the inferior walls of the orbit are not related to the superior orbital fissure. The superior orbital fissure lies superior to the orbit and connects the cavernous sinus to the orbital contents. The inferior walls of the orbit are separate entities and do not participate in the formation of the superior orbital fissure.

**Clinical Pearl:** Understanding the anatomy of the orbit is essential for proper diagnosis and management of orbital pathologies. A thorough knowledge of the orbital walls, including the inferior walls, is crucial for the assessment and treatment of patients with orbital diseases or injuries.