Structures present at the lateral wall of cavernous sinus are all EXCEPT:
**Core Concept**
The cavernous sinus is a venous structure located on either side of the sella turcica, and its lateral wall contains important cranial nerves and blood vessels. The anatomy of the cavernous sinus is crucial for understanding various neurological and ophthalmological conditions.
**Why the Correct Answer is Right**
The correct answer is related to the structures present at the lateral wall of the cavernous sinus. The lateral wall of the cavernous sinus contains the nerves of the trigeminal ganglion (V1, V2, and V3), the internal carotid artery, the abducens nerve (CN VI), and the sympathetic plexus. The trigeminal ganglion is a crucial structure that transmits sensory information from the face to the brain.
**Why Each Wrong Option is Incorrect**
* **Option A:** The abducens nerve (CN VI) is indeed present at the lateral wall of the cavernous sinus, so this option is incorrect.
* **Option B:** The internal carotid artery is also present at the lateral wall of the cavernous sinus, making this option incorrect.
* **Option C:** The sympathetic plexus is present at the lateral wall of the cavernous sinus, which makes this option incorrect.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that the cavernous sinus is a location where various cranial nerves and blood vessels converge, making it a critical area to consider in cases of neurological and ophthalmological disorders.
**Correct Answer:** D.