Muscles of Posterior compartment of forearm Flashcards Preview

Gross Anatomy > Muscles of Posterior compartment of forearm > Flashcards

Flashcards in Muscles of Posterior compartment of forearm Deck (33):
1

Brachioradialis Origin

Lateral supra-epicondylar ridge of humerus

2

Brachioradialis Insertion

Lateral surface of distal end of radius, proximal to styloid process

3

Brachioradialis Action

-Weak flexion of forearm

*Maximal when forearm is in midpronated position

4

Extensor carpi radialis longus Origin

Lateral supra-epicondylar ridge of humerus

5

Extensor carpi radialis longus Insertion

Dorsal aspect of base of 2nd metacarpal

6

Extensor carpi radialis longus Action-2

-Extend wrist
-Abduct hand (Radial Deviation)

7

Extensor carpi radialis brevis Origin

Lateral epicondyle of humerus

8

Extensor carpi radialis brevis Insertion

Dorsal aspect of base of 3rd metacarpal

9

Extensor carpi radialis brevis Action-2

-Extend wrist
-Abduct hand (Radial deviation)

*When fist is clenched

10

Extensor digitorum Origin

Lateral epicondyle of humerus

11

Extensor digitorum Insertion

Extensor expansions of medial 4 fingers

12

Extensor digitorum Action

Extends medial 4 fingers at both the metacarpophalangeal joints and interphalangeal joints

13

Extensor digiti minimi Origin

Lateral epicondyle of humerus

14

Extensor digiti minimi Insertion

Extensor expansion of 5th finger

15

Extensor digiti minimi Action

Extends 5th finger at both the metacarpophalangeal joints and interphalangeal joints

16

Extensor carpi ulnaris Origin-2

-Lateral epicondyle of humerus
-Posterior border of ulna

17

Extensor carpi ulnaris Insertion

Dorsal aspect of base of 5th metacarpal

18

Extensor carpi ulnaris Action-2

-Extends wrist*
-Adducts hand (Ulnar deviation)

*Active when fist clenching

19

Supinator Origin-4

-Lateral epicondyle of humerus
-Radial collateral and anular ligaments
-Supinator fossa
-Crest of ulna

20

Supinator Insertion

Lateral, posterior, and anterior surfaces of proximal 1/3 of radius

21

Supinator Action

Supinates forearm

22

Abductor pollicis longus Origin

Posterior surface of proximal halves of ulna, radius, and interosseous membrane

23

Abductor pollicis longus Insertion

Base of 1st metacarpal

24

Abductor pollicis longus Action

-Abducts thumb
-Extends at carpometacarpal joint

25

Extensor pollicis longus Origin

Posterior surface of middle third of ulna and interosseous membrane

26

Extensor pollicis longus Insertion

Dorsal aspect of base of distal phalanx of thumb

27

Extensor pollicis longus Action-2

-Extends distal phalanx of thumb at interphalangeal joint
-Extends metacarpophalangeal and carpometacarpal joints

28

Extensor pollicis brevis Origin

Posterior surface of distal 1/3 of radius and interosseous membrane

29

Extensor pollicis brevis Insertion

Dorsal aspect of base of proximal phalanx of thumb

30

Extensor pollicis brevis Action

-Extends proximal phalanx of thumb
-Extends carpometacarpal joint

31

Extensor Indicis Origin

Posterior surface of distal 1/3 of ulna and interosseous membrane

32

Extensor Indicis Insertion

Extensor expansion of 2nd finger

33

Extensor Indicis Action

Extends 2nd finger

Also helps extend hand at wrist