Thumb muscles
What is the primary action of the adductor pollicis muscle?
adduction of the thumb.
What is the origin of the extensor carpi radialis brevis
Lateral epicondyle of the humerus.
What is the nerve roots of Palmaris longus
C6,7,8, Thoracic 1
The opponens digiti minimi works at which joint of which finger?
The carpometacarpal joint of the little finger.
What is the action of Extensor digitorum?
extends the metacarpophalangeal, interphalangeal joints through the second and fifth fingers.
What is the insertion of the flexor pollicis brevis muscle?
Base of the proximal phalanx of the thumb.
What is the origin of the extensor carpi ulnaris?
Lateral epicondyle of the humerus.
What is a common origin for MOST wrist flexor muscles?
medial epicondyle of the humerus
The median and ulnar nerve are responsible for innervating which fingers?
Median is the first and second finger and the ulnar is the third and fourth finger.
This muscle goes into the extensor expansion of the index finger with the extensor digitorum longus tendon. Name the muscle and this description of it.
Insertion and extensor indicis
What is the insertion of the abductor pollicis longus?
Base of the first metacarpal bone, radial side.
What is the origin of the extensor carpi radialis longus
Distal, lateral supracondylar ridge of the humerus.
Of all the main wrist flexor muscles, which muscle has two different origins.
Flexor carpi ulnaris
Which hand muscle flexes over four joints.
Flexor digitorum profundus
What muscles main action is abduction but assists in extension of the interphalangeal joint of the fourth finger.
abductor digiti minimi
What is the origin of the extensor pollicis brevis muscle?
Posterior surface of the radius and the interosseous membrane.
What is the nerve innervation of the extensor carpi ulnaris?
Radial C6, 7, 8.
Name all of the actions of the flexor carpi radialis.
Flexes the wrist & abducts the wrist. Assist to pronate the forearm & flex the elbow.
What is the origin of each palmar interossei?
First: base of the fifth metacarpal, Ulnar side
Second: length of the second metacarpal, ulnar side
The dorsal interossei are innervated by which nerve and nerve roots.
Ulnar, C8, T1.
What is the nerve innervation of the abductor pollicis longus muscle?
Radial, C6, 7, 8
What is the insertion of the extensor carpi radialis brevis?
Base of the 3rd metacarpal bone.
which ligament limits wrist flexion?
Dorsal radiocarpal.
These are the four muscles that flex and assist in flexion of the first finger.
Dorsal interossei, palmar interossei, flexor digitorum superficialis, flexor digitorum profundus.
If the lateral cord of the brachial plexus is injured which finger extensors would be affected.
None.