Medial wall of orbit is formed by all except:
**Core Concept**
The medial wall of the orbit is a critical anatomical structure that separates the orbit from the ethmoid sinus and the nasal cavity. It is formed by a combination of bones that provide support and protection to the delicate orbital contents.
**Why the Correct Answer is Right**
The medial wall of the orbit is primarily formed by the lamina papyracea of the ethmoid bone, which is a thin, paper-like plate of bone that separates the orbit from the ethmoid sinus. The lacrimal bone also contributes to the medial wall, forming the anterior portion of the wall. Additionally, the orbital plate of the ethmoid bone and the maxillary bone may also be involved in the formation of the medial wall.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but typically, the correct answer would be one of the bones listed below.
**Option B:** This option is incorrect because the lacrimal bone does contribute to the medial wall of the orbit.
**Option C:** This option is incorrect because the orbital plate of the ethmoid bone does contribute to the medial wall of the orbit.
**Option D:** This option is incorrect because the maxillary bone does contribute to the medial wall of the orbit.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the medial wall of the orbit is thin and may be more susceptible to fractures, particularly in the context of traumatic injuries. The lamina papyracea is a common site for orbital fractures, which can lead to complications such as orbital emphysema and vision loss.
**Correct Answer:** A.