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Anatomy of the Hand: Thumb Movements and Carpal Tunnel

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Anatomy of the Hand: Thumb Movements and Carpal Tunnel

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Questions and Answers

What is the primary function of the dorsal digital expansions (extensor hoods)?

To flex the metacarpophalangeal joints

To abduct the fingers

To extend the proximal and distal interphalangeal joints (correct)

To stabilize the wrist joint

Where does the Extensor Carpi Ulnaris (ECU) muscle originate?

Posterior border of the ulna

Olecranon process of the ulna

Supinator crest of the ulna

Lateral epicondyle of the humerus (correct)

What is the primary function of the Anconeus muscle?

To supinate the forearm

To extend the forearm

To stabilize the elbow joint (correct)

To flex the elbow joint

Where does the Supinator muscle originate?

Supinator crest of the ulna and lateral epicondyle of the humerus Signup and view all the answers

What is the relationship between the Supinator muscle and the deep branch of the radial nerve?

The deep branch of the radial nerve passes through the Supinator muscle Signup and view all the answers

What is the primary function of the interossei and lumbrical muscles in relation to the dorsal digital expansions (extensor hoods)?

They flex the metacarpophalangeal joints, which then extends the interphalangeal joints via the extensor expansions Signup and view all the answers

Which structure converts the anterior concavity of the carpus into a carpal tunnel?

Flexor retinaculum Signup and view all the answers

Which nerve innervates the muscles of the posterior compartment of the forearm?

Radial nerve Signup and view all the answers

What is the primary action of the muscles that cross the wrist in the posterior compartment of the forearm?

Extension of the wrist Signup and view all the answers

What is the primary action of the muscles that cross the digits in the posterior compartment of the forearm?

Extension of the digits Signup and view all the answers

Which layer of the posterior compartment of the forearm contains the supinator muscle?

Deep layer Signup and view all the answers

What defines the movements of the thumb at right angles to the movements of the other fingers of the hand?

90° medial rotation of the first metacarpal bone Signup and view all the answers

Which structure forms the Carpal Tunnel by attaching to the sides of the carpal arch?

Flexor retinaculum Signup and view all the answers

Which muscle has its origin at the palmar aponeurosis and insertion at the lateral side of the base of the proximal phalanx of the thumb?

Abductor Pollicis Brevis (APB) Signup and view all the answers

What is the innervation pattern for all of the hypothenar muscles?

Ulnar nerve Signup and view all the answers

Which muscle has its origin at the flexor retinaculum and insertion at the 1st metacarpal bone?

Opponens Pollicis (OP) Signup and view all the answers

Which nerve passes through the Carpal Tunnel along with nine tendons?

Median nerve Signup and view all the answers