Muscle Actions
What is the action of the opponens pollicis
Opposition of the thumb at the CMC joint (bringing the pads of the thumb and fifth finger together)
Where does the abductor pollicic brevis insert
Base of proximal phalanx of the thumb
What nerve innervations the flexor digiti minimi brevis
Ulnar
What two bones articulate with the radius
scaphoid and lunate
Which group of ligaments are thicker, stronger, and in total have more
Palmar ligaments
What are the actions of the abductor pollicis brevis
Abduct the thumb and assist in opposition of the thumb
What are the insertions of the opponens digiti minimi
Shaft of fifth metacarpal on the ulnar surface
What nerve innervates the adductor pollicis
Ulnar
Name all of the carpal bones
Schaphoid, lunate, triquetrium, pisiform, hamate, capitate, trapzoid, trapezium
Describe what an extrinsic ligament is
ligament that connects radius, ulna, or metacarpals to the carpals
What are the actions of the flexor digiti minimi brevis
Flex the fifth finger and assist in opposition of the fifth finger toward the thumb
What is the origin of the abductor pollicic brevis
Flexor retinaculum, trapezium, and scaphoid tubercles
What is the nerve entrapment site by the brachioradialis and which nerve is it
Wartenberg and radial nerve
If you have a negative ulnar variance what bones are placed under more stress
Radius, scaphoid, and lunate
Which tendons run through the carpal tunnel
4 flexor digitorum superficialis and profundus tendons and flexor pollicis longus tendon
What are the actions of the lumbricals of the hand
Flex fingers 2-5 at MCP joints
Extend fingers 2-5 at IP joints
What are the insertions of the dorsal interosei
Base of the proximal phalanx of the second, third, and fourth fingers and the extensor aponeuorsis
What nerves innervate the flexor pollicis brevis
Superficial: Median
Deep: Ulnar
During a colles fracture, what bones push into the radius and in which direction does the bone go
Scaphoid and Lunate, Palmar direction
Which tendons run through the fourth extensor tunnel
Extensor digitorum and extensor indicis
What are the actions of the Palmar Interossei
Adduct the thumb, second, fourth, and fifth finger toward the third finger
Assist to flex the thumb, second, fourth, and fifth fingers at MCP joints
Assist to extend the thumb, second, fourth, and fifth fingers at IP joints
What is the superficial and deep head origin of the flexor pollicic brevis
Superficial: flexor retinaculum
Deep: trapezium, trapezoid, and capitate
What are the innervations of the lumbricals
Second and third: median
Fourth and fifth: ulnar
What bone in the hand increases the moment arm of the flexor carpi ulnaris
Pisiform
What ligament gets stretched with DISI wrist instability
scapholunate ligament