Adduction of hand at wrist is done by –
**Core Concept**
Adduction of the hand refers to the movement towards the midline of the body, specifically at the wrist joint. This action involves the contraction of specific muscles that facilitate the movement towards the body's midline.
**Why the Correct Answer is Right**
The primary muscles responsible for wrist adduction are the flexor carpi ulnaris and the flexor carpi radialis. The flexor carpi ulnaris, in particular, has a significant role in adducting the hand at the wrist joint. This muscle originates from the medial epicondyle of the humerus and inserts into the pisiform bone, the hook of the hamate, and the base of the 5th metacarpal bone. The contraction of flexor carpi ulnaris leads to the adduction of the hand at the wrist joint.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not specify a muscle responsible for adduction of the hand at the wrist joint.
* **Option B:** This option is incorrect as it mentions the extensor carpi radialis brevis, which is primarily involved in wrist extension.
* **Option C:** This option is incorrect as it mentions the flexor carpi radialis, which is primarily involved in wrist flexion and radial deviation.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that the flexor carpi ulnaris is also responsible for forearm pronation and is a key muscle in the medial compartment of the forearm. This muscle plays a crucial role in various hand and wrist movements.
**Correct Answer:** C. Flexor carpi ulnaris.