Hand (2) Flashcards
How do the fingers move?
Concave on convex (same direction)
What does the flexor pulley system prevent in the hand?
Bowstringing of flexor tendon
What does the extensor digitorum extend simultaneously?
Proximal, middle, and distal phalanges
What is the swan neck deformity at the PIP?
Rupture of the volar plate (collateral ligaments)
How much abduction is in the CMC joint?
20°
What is the closed pack position of the fingers?
Full flexion
What is the open packed position of the fingers?
Slight flexion
How does the CMC, MCP, and IP joint move?
Concave on convex (same direction)
What is the closed pack position of the thumb?
Opposition
What is the open pack position of the thumb?
Neutral
What are the finger flexor muscles at the DIP and PIP?
Flexor digitorum profundus and superficialis
What are the hand intrinsic muscles that create flexion at the MCP joint?
Palmar interossei
Dorsal interossei
Lumbricals
How does PIP and DIP extension occur?
Due to dorsal attachment to the dorsal lateral band
What are the intrinsic muscles of the thumb?
Flexor pollicis brevis
Abductor pollicis brevis
Adductor pollicis
Opponens pollicis
1st dorsal Interosseous
What is a boutonnières deformity?
Rupture the the extensor digitorum tendon going to the middle phalanx (central slip)
