Muscles of Posterior compartment of forearm Flashcards

1
Q

Brachioradialis Origin

A

Lateral supra-epicondylar ridge of humerus

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2
Q

Brachioradialis Insertion

A

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

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3
Q

Brachioradialis Action

A
  • Weak flexion of forearm

* Maximal when forearm is in midpronated position

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4
Q

Extensor carpi radialis longus Origin

A

Lateral supra-epicondylar ridge of humerus

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5
Q

Extensor carpi radialis longus Insertion

A

Dorsal aspect of base of 2nd metacarpal

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6
Q

Extensor carpi radialis longus Action-2

A
  • Extend wrist

- Abduct hand (Radial Deviation)

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7
Q

Extensor carpi radialis brevis Origin

A

Lateral epicondyle of humerus

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8
Q

Extensor carpi radialis brevis Insertion

A

Dorsal aspect of base of 3rd metacarpal

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9
Q

Extensor carpi radialis brevis Action-2

A
  • Extend wrist
  • Abduct hand (Radial deviation)

*When fist is clenched

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10
Q

Extensor digitorum Origin

A

Lateral epicondyle of humerus

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11
Q

Extensor digitorum Insertion

A

Extensor expansions of medial 4 fingers

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12
Q

Extensor digitorum Action

A

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

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13
Q

Extensor digiti minimi Origin

A

Lateral epicondyle of humerus

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14
Q

Extensor digiti minimi Insertion

A

Extensor expansion of 5th finger

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15
Q

Extensor digiti minimi Action

A

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

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16
Q

Extensor carpi ulnaris Origin-2

A
  • Lateral epicondyle of humerus

- Posterior border of ulna

17
Q

Extensor carpi ulnaris Insertion

A

Dorsal aspect of base of 5th metacarpal

18
Q

Extensor carpi ulnaris Action-2

A
  • Extends wrist*
  • Adducts hand (Ulnar deviation)

*Active when fist clenching

19
Q

Supinator Origin-4

A
  • Lateral epicondyle of humerus
  • Radial collateral and anular ligaments
  • Supinator fossa
  • Crest of ulna
20
Q

Supinator Insertion

A

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

21
Q

Supinator Action

A

Supinates forearm

22
Q

Abductor pollicis longus Origin

A

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

23
Q

Abductor pollicis longus Insertion

A

Base of 1st metacarpal

24
Q

Abductor pollicis longus Action

A
  • Abducts thumb

- Extends at carpometacarpal joint

25
Q

Extensor pollicis longus Origin

A

Posterior surface of middle third of ulna and interosseous membrane

26
Q

Extensor pollicis longus Insertion

A

Dorsal aspect of base of distal phalanx of thumb

27
Q

Extensor pollicis longus Action-2

A
  • Extends distal phalanx of thumb at interphalangeal joint

- Extends metacarpophalangeal and carpometacarpal joints

28
Q

Extensor pollicis brevis Origin

A

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

29
Q

Extensor pollicis brevis Insertion

A

Dorsal aspect of base of proximal phalanx of thumb

30
Q

Extensor pollicis brevis Action

A
  • Extends proximal phalanx of thumb

- Extends carpometacarpal joint

31
Q

Extensor Indicis Origin

A

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

32
Q

Extensor Indicis Insertion

A

Extensor expansion of 2nd finger

33
Q

Extensor Indicis Action

A

Extends 2nd finger

Also helps extend hand at wrist