17 Questions
What is the primary function of the dorsal digital expansions (extensor hoods)?
To extend the proximal and distal interphalangeal joints
Where does the Extensor Carpi Ulnaris (ECU) muscle originate?
Lateral epicondyle of the humerus
What is the primary function of the Anconeus muscle?
To stabilize the elbow joint
Where does the Supinator muscle originate?
Supinator crest of the ulna and lateral epicondyle of the humerus
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
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
Which structure converts the anterior concavity of the carpus into a carpal tunnel?
Flexor retinaculum
Which nerve innervates the muscles of the posterior compartment of the forearm?
Radial nerve
What is the primary action of the muscles that cross the wrist in the posterior compartment of the forearm?
Extension of the wrist
What is the primary action of the muscles that cross the digits in the posterior compartment of the forearm?
Extension of the digits
Which layer of the posterior compartment of the forearm contains the supinator muscle?
Deep layer
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
Which structure forms the Carpal Tunnel by attaching to the sides of the carpal arch?
Flexor retinaculum
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)
What is the innervation pattern for all of the hypothenar muscles?
Ulnar nerve
Which muscle has its origin at the flexor retinaculum and insertion at the 1st metacarpal bone?
Opponens Pollicis (OP)
Which nerve passes through the Carpal Tunnel along with nine tendons?
Median nerve
Explore the unique anatomy of the hand, focusing on the 90° medial rotation of the thumb's axis and the formation of the carpal arch. Learn how the carpal tunnel is created and understand the structures passing through it like tendons (FDS, FDP, FPL) and the median nerve.
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