anatomy of arm muscles, nerves and vasculature

Question 1

Flexor Carpi Radialis:
Actions;
Origin:
Insertion:
Innervation

Answer 1

• Flex the wrist, abduct the wrist, assist flex of elbow
• common flexor tendon from medial epicondyle of humerus
• bases of second and third metacarpal
• median C6, C7, C8

Question 2

Extensor Carpi Radials, longus and brevis:
Actions;
Origin:
Insertion:
Innervation

Answer 2

*Extend the wrist, abduct the wrist, assist to flex of elbow
*longus: distal one-third of the lateral supracondylar ridge of humerus.
brevis: common flexor tendon from lateral epicondyle of humerus
*longus: base of second metacarpal.
brevis: base of third metacarpal
*longus: radial C5,C6,C7,C8
brevis : radial C6, C7, C8

Question 3

Extensor Carpi Ulnaris
Actions;
Origin:
Insertion:
Innervation

Answer 3

*Extend the wrist, adduct the wrist
*common extensor tendon from lateral epicondyle of humerus
*base of fifth metacarpal.
*radial C6,C7,C8

Question 4

Extensor Digitorum
Actions;
Origin:
Insertion:
Innervation

Answer 4

*Extend the second through to fifth fingers (metacarpophalangeal and interphalangeal joints); assist in extending the wrist (radiocarpal joint)
* common extensor tendon from lateral epicondyle of humerus
* bases of middle and distal phalanges of second through to fifth fingers
* radial C6,C7,C8

Question 5

Palmaris Longus
Actions;
Origin:
Insertion:
Innervation

Answer 5

*tense the palmar fascia; flex the wrist (radiocarpal joint); assist flex of the elbow
*common flexor tendon from medial epicondyle of humerus
* flexor retinaculum and palmar aponeurosis
* median C6, C7, C8, T1

Question 6

Flexor Carpi Ulnaris
Actions;
Origin:
Insertion:
Innervation

Answer 6

*flex the wrist (radiocarpal joint); adduct the wrist; assist flex of the elbow
*humeral head: common flexor tendon from medial epicondyle of humerus.
Ulnar head: posterior surface of proximal two-thirds of ulna
*pisiform, hook of the hamate and base of the fifth metacarpal
*ulnar C7, C8, T1

Question 7

Flexor digitorum Superficialis
Actions;
Origin:
Insertion:
Innervation

Answer 7

• flex the second through to fifth fingers (metacarpophalangeal and proximal interphalangeal joints); flex the wrist (radiocarpal joint)
  *common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane and proximal shaft of radius
• sides of middle phalanges of second through fifth fingers
• median C7, C8, T1

Question 8

Flexor digitorum Profundis
Actions;
Origin:
Insertion:
Innervation

Answer 8

• flex the second through to fifth fingers (metacarpophalangeal and distal interphalangeal joints);
  assist in flexing the wrist (radiocarpal joint)
  *anterior and medial surfaces of proximal three-quarters of ulna
• bases of distal phalanges, palmar surface of second through fifth fingers
• second & third fingers:median C7, C8, T1; forth and fifth fingers ulnar C7, C8, T1

Question 9

Pronator Teres
Actions;
Origin:
Insertion:
Innervation

Answer 9

• pronate the forearm; assist in flexing the elbow (humeroulnar joint)
• common flexor tendon from medial epicondyle of the humerus and coronoid process of the ulna
• middle of the lateral surface of the radius
  *median C6, C7,

Question 10

Pronator Quadratus
Actions;
Origin:
Insertion:
Innervation

Answer 10

*pronate the forearm (radioulnar joints)
*medial, anterior surface of the distal ulna
* lateral, anterior surface of distal radius
* median C7,C8,T1

Question 11

Supinator
Actions;
Origin:
Insertion:
Innervation

Answer 11

• supinate the forearm (radioulnar joints)
  *lateral epicondyle of humerus, radial collateral ligament, annular ligament, and supinator crest of the ulna
• anterior, lateral surface of proximal one-third of the radial shaft
• median C5,C6,C7

Question 12

Anconeus
Actions;
Origin:
Insertion:
Innervation

Answer 12

• extend the elbow (humeroulnar joint)
• lateral epicondyle of the humerus
  *olecranon process and the posterior, proximal surface of the ulna
• radial C7, C8

Question 13

extensor Indices
Actions;
Origin:
Insertion:
Innervation

Answer 13

• extend the second finger (metacarpophalangeal joint); adduct the second finger; assist to extend the wrist (radiocarpal joint)
• posterior surface of the distal shaft of the ulna and interosseus membrane
  *tendon of the extensor digitorum at the level of the second metacarpal
• radial C6, C7, C8

Question 14

Abductor Pollicis Longus
Actions;
Origin:
Insertion:
Innervation

Answer 14

A. abduct the thumb (carpometacarpal joint); extend the thumb; Abduct the wrist
O. posterior surface of the radius and ulna and interosseous membrane
I. Base of the first metacarpal
N. Radial C6, C7, C8

Question 15

Extensor Pollicis Longus and brevis
Actions;
Origin:
Insertion:
Innervation

Answer 15

A. extend the thumb (interphalangeal joint); extend the thumb; Abduct the wrist
O. longus… the posterior surface of the ulna and interosseous membrane
brevis… the posterior surface of the radius and the interosseus membrane
I. longus…base of the distal phalanx of the thumb
brevis … base of the proximal phalanx of the thumb
N. Radial C6, C7, C8

Question 16

Flexor Pollicis Longus
Actions;
Origin:
Insertion:
Innervation

Answer 16

A. flex the thumb (interphalangeal joint); flex the thumb (metacarpophalangeal and carpometacarpal joints); Assist to flex the wrist
O. anterior surface of radius and the interosseus membrane
I. base of the distal phalanx of the thumb
N. Median C6, C7, C8, T1

Question 17

Abductor Pollicis Brevis
Actions;
Origin:
Insertion:
Innervation

Answer 17

A. abduct the thumb (metacarpophalangeal and carpometacarpal joints); Assist in opposition of the thumb
O. flexor retinaculum, trapezium,and scaphoid tubercles
I. base of the proximal phalanx of the thumb
N. Median C6, C7, C8, T1