CHT Hand Anatomy & Biomechanics Flashcards
6 cards from real CHT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CHT Hand Anatomy & Biomechanics flashcards as text
The radial nerve innervates which muscle that is commonly tested in high radial nerve palsy?
Answer: Extensor carpi radialis longus
The extensor carpi radialis longus is innervated by the radial nerve proximal to the lateral epicondyle and is used to assess the level of radial nerve palsy.
During pinch, the first dorsal interosseous muscle is responsible for:
Answer: Index finger radial abduction
The first dorsal interosseous abducts the index finger radially, stabilizing it during lateral (key) pinch against the thumb.
The proximal interphalangeal (PIP) joint is a hinge joint whose stability is primarily provided by:
Answer: Volar plate and collateral ligaments
PIP joint stability relies on the volar plate preventing hyperextension and the proper collateral ligaments resisting lateral stress.
Which forearm rotation motion is primarily performed by the supinator muscle?
Answer: Supination with elbow extended
The supinator muscle is the primary supinator when the elbow is extended; biceps brachii becomes more effective at supination with the elbow flexed.
Froment's sign is used to assess the integrity of which muscle, indicating ulnar nerve dysfunction?
Answer: Adductor pollicis
Froment's sign tests the adductor pollicis; when weakened from ulnar nerve palsy, the patient compensates with FPL flexion to maintain lateral pinch.
The anatomic snuffbox is bordered by which two structures?
Answer: EPL and EPB/APL
The anatomic snuffbox is bounded by extensor pollicis longus (EPL) ulnarly and extensor pollicis brevis/abductor pollicis longus (EPB/APL) radially, overlying the scaphoid.