Muscles of the hand

The video tutorial explores the intrinsic muscles of the hand, focusing on the metacarpal, thenar, and hypothenar muscle groups. It details the anatomy, functions, and innervation of these muscles, highlighting their roles in fine motor skills. The tutorial also covers clinical notes on hand muscles, including the lumbrical plus finger phenomenon, and concludes with a summary of key points.

What are the three main groups of intrinsic muscles of the hand?

• Flexor, extensor, and abductor muscles

• Extrinsic, intrinsic, and superficial muscles

• Metacarpal, thenar, and hypothenar muscles

• Radial, ulnar, and median muscles

Which nerve innervates the dorsal interossei muscles?

• Radial nerve

• Median nerve

• Deep branch of the ulnar nerve

• Superficial branch of the ulnar nerve

What is the primary function of the palmar interossei muscles?

• Extend the thumb

• Abduct the fingers

• Adduct the fingers

• Flex the wrist

Which lumbricals are innervated by the median nerve?

• Lumbricals 3 and 4

• None of the lumbricals

• Lumbricals 1 and 2

• All lumbricals

Which muscle is responsible for the opposition of the thumb?

• Adductor pollicis

• Abductor pollicis brevis

• Flexor pollicis brevis

• Opponens pollicis

Which nerve primarily innervates the thenar muscles?

• Median nerve

• Axillary nerve

• Radial nerve

• Ulnar nerve

What is the main action of the abductor digiti minimi muscle?

• Extend the little finger

• Abduct the little finger

• Flex the little finger

• Adduct the little finger

Which muscle tightens the palmar aponeurosis to improve grip strength?

• Palmaris brevis

• Flexor digiti minimi

• Abductor digiti minimi

• Opponens digiti minimi

What is the primary function of the flexor digiti minimi brevis muscle?

• Extend the little finger

• Abduct the little finger

• Flex the little finger

• Adduct the little finger

What is the lumbrical plus finger phenomenon?

• A phenomenon where the lumbricals become the insertion point for the flexor digitorum profundus

• A condition where the lumbricals are overactive

• An injury to the extensor tendons

• A type of muscle spasm in the hand