**Question:** Injury to radial nerve in lower pa of spiral groove may result in all EXCEPT:-

A. Radial nerve dysfunction causing loss of supination and wrist extension (Option A is correct because supination and wrist extension are functions of the ulnar nerve, not radial nerve)
B. Radial artery injury (Option B is incorrect because the injury to radial nerve does not affect the radial artery)
C. Radial artery injury (Option C is incorrect because the injury to radial nerve does not affect the radial artery)
D. Ulnar nerve injury (Option D is incorrect as the injury in question is to the radial nerve, not the ulnar nerve)

**Core Concept:** The radial nerve is a large peripheral nerve that runs along the posterior aspect of the forearm, providing motor and sensory innervation to various regions. In the lower part of the spiral groove, the radial nerve is surrounded by the spiral ligament, which protects it from injury. Injuries to the radial nerve in this region can lead to various deficits depending on the site and type of injury.

**Why the Correct Answer is Right:** The correct answer C (radial artery injury) and D (ulnar nerve injury) are not related to the radial nerve injury mentioned in the question. The radial nerve injury would result in radial nerve dysfunction, causing loss of supination and wrist extension. These are functions of the ulnar nerve, not the radial nerve.

**Why Each Wrong Option is Incorrect:**

A. Radial nerve dysfunction causing loss of supination and wrist extension (Option A is correct because supination and wrist extension are functions of the ulnar nerve, not the radial nerve)
B. Radial artery injury (Option B is incorrect because the injury to radial nerve does not affect the radial artery)
C. Radial artery injury (Option C is incorrect as mentioned above)
D. Ulnar nerve injury (Option D is incorrect as mentioned above)

**Clinical Pearl:** It is essential for healthcare professionals to understand the anatomy and function of the peripheral nerves for accurate diagnosis and management of nerve injuries. Injuries to the radial nerve can lead to specific motor and sensory deficits, which can guide the healthcare provider in determining the appropriate treatment and prognosis for the patient.