Forearm and Hand (Chapter 3) Exam III Flashcards
What forms the “point” of the elbow?
olecranon process
What is the action of brachialis?
flex the elbow (humeroulnar joint)
What is the origin of brachialis?
distal half of anterior surface of humerus
What is the insertion of brachialis?
Tuberosity and coronoid process of ulna
when do you use your brachialis?
bringing food from the plate to the mouth, picking up a load of anatomy books, carrying a baby car seat
What actions does the brachioradialis execute?
flex the elbow, assist to pronate and supinate the forearm when these movements are resisted.
What is the origin of the brachioradialis?
proximal two-thirds of the lateral supracondylar ridge of humerus
What is the insertion of the brachioradialis?
styloid process of radius
when do you use the brachioradialis muscle?
turning a door handle or screwdriver, bringing a beer stein up to your mouth, whisking cream in a bowl, hositing a toddler out of her crib
What actions does the extensor carpi radialis longus and brevis execute?
extend the wrist, ad-duct the wrist, assist to flex the elbow
What is the origin of extensor carpi radialis longus?
distal one-third of the lateral supracondylar ridge of humerus
What is the insertion of extensor carpi radialis longus?
base of second metacarpal
What is the origin of extensor carpi radialis brevis?
common extensor tendon from the lateral epicondyle of humerus
What is the insertion of extensor carpi radialis brevis?
base of third metacarpal
What action is executed by extensor carpi ulnaris?
extend the wrist, and adduct the wrist
What is the origin of extensor carpi ulnaris?
common extensor tendon from the lateral epicondyle of humerus
What is the insertion of extensor carpi ulnaris?
base of fifth metacarpal
What action is executed by extensor digitorum?
extend the second through fifth fingers, assist to extend the wrist
What is the origin of extensor digitorum ?
common extensor tendon from the lateral epicondyle of humerus
What is the insertion of extensor digitorum?
bases of middle and distal phalanges of second through fifth fingers
“Wad of Three” is referring to what three muscles?
Brachioradialis, extensor carpi radialis lonus and brevis
What weak elbow extensor muscle is located lateral to the olecranon process?
Anconeus
what action does the anconeus do?
extend the elbow
What is the origin of the anconeus?
lateral epicondyle of the humerus
what is the insertion of the anconeus?
olecranon process and posterior, proximal surface of ulna
What small but crucial muscle assists the digitorum in specifically extending the index finger?
Exenstor Indicis
What actions does the extensor indicis execute?
extend the second finger, adduct the second finger, may assist to extend the wrist
What is the origin of the extensor indicis ?
posterior surface of distal shaft of ulna and interosseous membrane
What is the insertion of the extensor indicis?
tendon of the extensor digitorum at the level of the second metacarpal.
What actions does the flexor carpi radialis do?
flex the wrist, ab-duct the wrist, may assist to flex the elbow
What is the origin of the flexor carpi radialis ?
common flexor tendon from medial epicondyle of humerus
what is the insertion of the flexor carpi radialis?
bases of second and third metacarpals
what actions does palmaris longus do?
tense the palmar fascia, flex the wrist, and may assist to flex the elbow
What is the origin of the palmaris longus?
common flexor tendon from meidal epicondyle of humerus
what is the insertion of the palmaris longus?
flexor retinaculum and palmar aponeurosis
What actions does flexor carpi ulnaris?
flex the wrist, adduct the wrist, and assist to flex the elbow
What is the origin of flexor carpi ulnaris?
common flexor tendon from medial epicondyle of humerus, posterior surface of proximal two-thirds of ulna
What is the insertion of flexor carpi ulnaris?
pisiform, hook of hamate and base of fifth metacarpal
What actions does the flexor digitorum superficialis ?
flex the second through fifth fingers
What is the origin of flexor digitorum superficialis?
common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius
What is the insertion of flexor digitorum superficialis?
sides of middle phalanges of second through fifth fingers
What is the actions of flexor digitorum profundus?
flex the second through fifth fingers
what is the origin of flexor digitorum profundus?
anterior and medial surfaces of proximal three-quarters of ulna
What is the insertion of flexor digitorum profundus?
bases of distal phalanges, palmar surface of second through fifth fingers
What percentage of the population is the palmaris longus absent in?
11%
What actions does the pronator teres execute?
pronate the forearm, assist to flex the elbow
what is the origin of the pronator teres?
common flexor tendon from medial epicondyle of humerus and coronoid process of the ulna
What is the insertion of the pronator teres?
middle of lateral surface of the radius
when do you use your pronator teres?
turning a doorknob, arranging cups in the dishwasher, swimming the breaststroke
What actions does the pronator quadratus execute?
pronate the forearm
What is the origin of the pronator quadratus?
medial, anterior surface of distal ulna
What is the insertion of the pronator quadratus?
lateral, anterior surface of distal radius
What actions does the supinator execute?
supinate the forearm
What is the origin of the supinatior?
lateral epicondyle of humerus, radial collateral ligament, annular ligament and supinator crest of the ulna
What is the insertion of the supinator?
anterior, lateral surface of proximal one-third of radial shaft
when do you use the supinator?
digging out a big scoop of ice cream, swirling the water in a bathtub, folding your clothes
How many muscles are involved in moving the thumb?
8; four short and four long
what actions does the abductor pollicis longus?
the ab-duct the thumb, extend the thumb, ab-duct the wrist
what origin is the abductor pollicis longus?
posterior surface of radius and ulna, and interosseous membrane
what is the insertion of the abductor pollicic longus?
base of the first metacarpal
What actions does the extensor pollicis longus and brevis execute?
extend the thumb, ab-duct the wrist
What is the origin of extensor pollicis longus?
posterior surface of ulna and interosseous membrane, posterior surface of radius and interosseous membrane
What is the insertion of extensor pollicis longus?
base of distal phalanx of thumb, base of proximal phalanx of thumb
what actions does the flexor pollicis longus?
flex the thumb, assist to flex the wrist
what is the origin of flexor pollicis longus?
anterior surface of radius and interosseous membrane
what is the insertion of flexor pollicis longus?
base of distal phalanx of thumb
