Small muscles of hand are supplied by –
First, the core concept here is the innervation of the intrinsic hand muscles. The intrinsic muscles include the thenar muscles (abductor pollicis brevis, flexor pollicis brevis, and opponens pollicis), the hypothenar muscles (abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi), the lumbricals, and the interossei (dorsal and palmar).
The median nerve supplies the thenar muscles, except for the adductor pollicis, which is supplied by the ulnar nerve. The ulnar nerve also supplies all the intrinsic muscles of the hand except the thenar muscles and the lateral two lumbricals. The lumbricals are split here: the first and second are innervated by the median nerve, while the third and fourth are innervated by the ulnar nerve. The interossei and hypothenar muscles are all supplied by the ulnar nerve.
Now, the options might include the radial nerve, which doesn't supply intrinsic hand muscles. The musculocutaneous nerve is more upper arm, so that's out. The correct answer should be the ulnar and median nerves. But since the question is about the small muscles, the ulnar nerve is the primary supplier for most of them except the thenar muscles. Wait, the thenar muscles are supplied by the median nerve. So if the question is about all small muscles, the answer would be both nerves. But if the options are separate, maybe the answer is ulnar nerve for most and median for others. However, in standard questions, the ulnar nerve is the main one for the intrinsic muscles. Wait, maybe the question is a trick to test that the median nerve does supply some, but the majority are ulnar. So the correct answer is the ulnar nerve. Let me verify.
Yes, the ulnar nerve innervates all the intrinsic muscles of the hand except the thenar muscles (which are median) and the lateral two lumbricals (median). So if the question is about the small muscles, the answer is the ulnar nerve. The options might have ulnar nerve as one option. So the correct answer is the ulnar nerve. The other nerves like radial and musculocutaneous are not involved. So the clinical pearl here is that the ulnar nerve is responsible for most intrinsic hand muscles, and its injury leads to claw hand due to unopposed action of the flexor digitorum profundus.
**Core Concept**
The intrinsic muscles of the hand are primarily innervated by the **ulnar nerve**, with exceptions such as the thenar muscles and lateral lumbricals supplied by the **median nerve**. This is critical for fine motor control and grip strength.
**Why the Correct Answer is Right**
The ulnar nerve (C8-T1) supplies **all intrinsic hand muscles** except the thenar muscles (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) and the lateral two lumbricals. These are innervated by the **median nerve**