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Gross Anatomy Muscles > Posterior Forearm and Dorsum of the Hand Muscles > Flashcards

Posterior Forearm and Dorsum of the Hand Muscles Flashcards

1
Q

Brachioradialis

Origin

A

-Lateral supracondylar ridge of humerus

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2
Q

Brachioradialis

Insertion

A

-Lateral surface of distal radius, proximal to styloid

process

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3
Q

Brachioradialis

Innervation

A

-Radial nerve (C5, C6, C7)

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4
Q

Brachioradialis

Action

A

-Weak flexion of elbow (maximal when forearm in

midpronated position)

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5
Q

Extensor Carpi Radialis Longus (ECRL)

Origin

A

-Lateral supracondylar ridge of humerus

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6
Q

Extensor Carpi Radialis Longus (ECRL)

Insertion

A

-Dorsal aspect of base of 2nd metacarpal

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7
Q

Extensor Carpi Radialis Longus (ECRL)

Innervation

A

-Radial nerve (C6, C7)

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8
Q

Extensor Carpi Radialis Longus (ECRL)

Action

A

-Extends and radially deviates wrist (active

during fist clenching)

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9
Q

Extensor Carpi Radialis Brevis (ECRB)

Origin

A

-Lateral epicondyle of humerus (via common

extensor tendon)

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10
Q

Extensor Carpi Radialis Brevis (ECRB)

Insertion

A

-Dorsal aspect of base of 3rd metacarpal

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11
Q

Extensor Carpi Radialis Brevis (ECRB)

Innervation

A

-Deep branch of radial nerve (C7, C8)

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12
Q

Extensor Carpi Radialis Brevis (ECRB)

Action

A

-Extends and radially deviates wrist (active during fist clenching)

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13
Q 
Extensor Digitorum (ED)
Origin
A

-Lateral epicondyle of humerus (via common extensor tendon)

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14
Q 
Extensor Digitorum (ED)
Insertion
A

-Extensor expansions of 2nd-5th digits

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15
Q 
Extensor Digitorum (ED)
Innervation
A

-Deep branch of radial nerve (C7, C8)

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16
Q 
Extensor Digitorum (ED)
Action
A
  • -Extends elbow
  • extends hand at wrist
  • extends 2nd -5th digits (primarily at MCP joint, secondarily at IP joint)
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17
Q

Extensor Digiti Minimi (EDM)

Origin

A

-Lateral epicondyle of humerus (via common

extensor tendon)

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18
Q

Extensor Digiti Minimi (EDM)

Insertion

A

-Extensor expansion of 5th digit

19
Q

Extensor Digiti Minimi (EDM)

Innervation

A

-Deep branch of radial nerve (C7, C8)

20
Q

Extensor Digiti Minimi (EDM)

Action

A
  • extends 5th digit (primarily at MCP joint, secondarily at IP joint)
  • Weak wrist extension
21
Q

Extensor Carpi Ulnaris (ECU)

Origin

A

-Lateral epicondyle of humerus (via common extensor tendon); posterior border of ulna

22
Q

Extensor Carpi Ulnaris (ECU)

Insertion

A

-Dorsal aspect of base of 5th metacarpal

23
Q

Extensor Carpi Ulnaris (ECU)

Innervation

A

-Deep branch of radial nerve (C7, C8)

24
Q

Extensor Carpi Ulnaris (ECU)

Action

A

-Extends and ulnarly deviates wrist (active during fist clenching)

25
Q

Supinator

Origin

A
  • Lateral epicondyle of humerus (via common extensor tendon)
  • radial collateral and anular ligaments
  • supinator fossa; crest of ulna
26
Q

Supinator

Insertion

A

-Lateral, posterior, and anterior surfaces of proximal third of radius

27
Q

Supinator

Innervation

A

-Deep branch of radial nerve (C7, C8)

28
Q

Supinator

Action

A

-Supinates forearm

29
Q

Abductor Pollicis Longus (APL)

Origin

A

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

30
Q

Abductor Pollicis Longus (APL)

Insertion

A

-Base of 1st metacarpal

31
Q

Abductor Pollicis Longus (APL)

Innervation

A

-Posterior interosseous nerve (C7, C8) (a continuation of deep branch of radial nerve)

32
Q

Abductor Pollicis Longus (APL)

Action

A

-Abducts and extends thumb at carpometacarpal

(CMC) joint

33
Q

Extensor Pollicis Brevis (EPB)

Origin

A

-Posterior surface of distal third of radius and

interosseous membrane

34
Q

Extensor Pollicis Brevis (EPB)

Insertion

A

-Dorsal aspect of base of proximal phalanx of thumb

35
Q

Extensor Pollicis Brevis (EPB)

Innervation

A

-Posterior interosseous nerve (C7, C8) (a continuation of deep branch of radial nerve)

36
Q

Extensor Pollicis Brevis (EPB)

Action

A
  • -Extends proximal phalanx of thumb at MCP joint

- extends CMC joint

37
Q

Extensor Pollicis Longus (EPL)

Origin

A
  • Posterior surface of middle third of ulna and

interosseous membrane

38
Q

Extensor Pollicis Longus (EPL)

Insertion

A

-Dorsal aspect of base of distal phalanx of thumb

39
Q

Extensor Pollicis Longus (EPL)

Innervation

A

-Posterior interosseous nerve (C7, C8) (a

continuation of deep -branch of radial nerve)

40
Q

Extensor Pollicis Longus (EPL)

Action

A
  • -Extends distal phalanx of thumb at IP joint

- extends thumb at MCP and CMC joints

41
Q

Extensor Indicis

Origin

A

-Posterior surface of distal third of ulna and

interosseous membrane

42
Q

Extensor Indicis

Inseriton

A

-Extensor expansion of 2nd digit

43
Q

Extensor Indicis

Innervation

A

-Posterior interosseous nerve (C7, C8) (a continuation of deep branch of radial nerve)

44
Q

Extensor Indicis

Action

A

-Extends 2nd digit (enabling its independent
extension from other digits)
-weakly extends hand at wrist

Gross Anatomy Muscles (12 decks)

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