Final answer:
A median nerve block at the elbow is a procedure where local anesthesia is injected around the median nerve to provide pain relief or anesthesia in the forearm, hand, and fingers. The landmark used for the block is the trochlear notch on the proximal ulna, which articulates with the trochlea of the humerus at the elbow.
Step-by-step explanation:
A median nerve block is a procedure where local anesthesia is injected around the median nerve to provide pain relief or anesthesia in the forearm, hand, and fingers. It is commonly performed at the elbow level, where the nerve can be easily accessed. The landmark used for the block is the trochlear notch, a large depression on the anterior side of the proximal ulna, which articulates with the trochlea of the humerus at the elbow.
The median nerve is a systemic nerve of the arm that originates from the brachial plexus and runs between the ulnar and radial nerves. It innervates the muscles responsible for bending the wrist toward the body and tilting the hand to the side away from the body. It also provides sensation to the palm and fingers.
A median nerve block at the elbow can be used to treat conditions such as carpal tunnel syndrome, wrist and hand arthritis, and certain types of nerve injuries. The block can be performed by a healthcare professional, such as an anesthesiologist or a pain management specialist, using appropriate sterile technique and monitoring.