Nerve compressed in Guyon’s canal is: September 2003
**Core Concept**
The **ulnar nerve** is susceptible to compression at various points along its course, one of which is Guyon's canal. This anatomical knowledge is crucial for diagnosing and managing ulnar nerve compression syndromes.
**Why the Correct Answer is Right**
The ulnar nerve passes through **Guyon's canal**, which is a narrow anatomical tunnel at the wrist. Compression of the ulnar nerve at this site can lead to symptoms such as numbness, paresthesia, and weakness in the hand, particularly affecting the little and ring fingers.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is not relevant to the specific anatomy of Guyon's canal.
**Option B:** Similarly, this option does not correctly identify the nerve involved in Guyon's canal syndrome.
**Option D:** This choice is also incorrect as it does not accurately represent the nerve compressed in Guyon's canal.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that **ulnar nerve compression** at Guyon's canal can cause symptoms similar to those seen in cubital tunnel syndrome, but the site of compression differs.
**Correct Answer:** D. Ulnar nerve