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Anatomy > Forearm Muscles > Flashcards

Forearm Muscles Flashcards

1
Q

Extensor Pollicis Longus

A

O: Posterior surface of ulna and interosseous membrane

I: Base of distal phalanx of thumb

N: Posterior interosseous nerve (Radial; C6-C8)

A: Extend thumb (IP, MCP, CMC joints); abduct wrist

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2
Q

Flexor Carpi Radialis

A

O: Common flexor tendon from medial epicondyle of humerus

I: Bases of 2nd/3rd metacarpals

N: Median (C6-C8)

A: Flex the wrist, abduct the wrist, may assist to flex elbow

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3
Q

Extensor Carpi Radialis Longus

A

O: Distal 1/3 of the lateral supracondylar ridge of humerus

I: base of 2nd metacarpal

N: Radial nerve (C5-C8)

A: Extend wrist, abduct wrist, assist to flex the elbow

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4
Q

Flexor Carpi Ulnaris

A

O: (Humeral head) - Common flexor tendon from medial epicondyle of humerus
(Ulnar head) - Posterior surface of proximal two-thirds of ulna

I: Pisiform, hook of hamate, and base of fifth metacarpal

N: Ulnar (C7-T1)

A: Flex the wrist, adduct the wrist (ulnar deviation), assist to flex elbow

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5
Q

Supinator

A

O: Lateral epicondyle of Humerus, radial collateral ligament, annular ligament, supinator crest of ulna

I: Anterior, lateral surface of proximal 1/3 of radial shaft

N: Deep branch of Radial nerve (C5-C7)

A: Supinate forearm

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6
Q

Flexor Digitorum Superficialis

(2nd layer)

A

O: Common flexor tendon from medial epicondyle of humerus, ulnar collateral ligament, coronoid process of ulna, interosseous membrane, and proximal shaft of radius

I: Sides of middle phalanges of 2nd to 5th fingers

N: Median (C7-T1)

A: Flex 2nd-5th fingers (MCP and distal IP joints); assist to flex wrist

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7
Q

Abductor Pollicis Longus

A

O: Posterior surface of radius and ulna, interosseous membrane

I: Base of 1st metacarpal

N: Posterior interosseous nerve (Radial; C6-C8)

A: Abduct thumb (CMC), extend thumb (CMC), abduct wrist

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8
Q

Flexor Digitorum Profundus

(3rd layer)

A

O: Anterior and medial surfaces of proximal 3/4 of ulna and interosseous membrane

I: Bases of distal phalanges, palmar surface of digits 2-5

N: (2nd and 3rd finger) - Median (C7-T1)
(4th and 5th finger) - Ulnar (C7-T1)

A: Flex 2-5 fingers (MCP, Distal IP joints); assist to flex wrist

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9
Q

Extensor Carpi Ulnaris

A

O: Lateral Epicondyle of Humerus (common extensor tendon)

I: Base of 5th metacarpal bone

N: Deep branch of Radial nerve (C6-C8)

A: Extend wrist, adduct wrist (ulnar deviation)

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10
Q

Pronator Quadratus

A

O: Medial, anterior surface of distal ulna

I: Lateral, anterior surface of distal radius

N: Anterior interosseous nerve (Median; C7-T1)

A: Pronates forearm

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11
Q

Extensor Pollicis Brevis

A

O: Posterior surface of radius interosseous membrane

I: Base of proximal phalanx of thumb

N: Posterior interosseous nerve (Radial; C6-C8)

A: Extend thumb (MCP and CMC joints), abduct wrist

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12
Q

Brachioradialis

A

O: Proximal 2/3 of lateral supracondylar ridge of humerus

I: Styloid process of radius

N: Radial (C5, C6)

A: Flex the elbow (humeroulnar joint), assist to PRONATE and SUPINATE the forearm when these movements are resisted (humeroradial joints)

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13
Q

Pronator Teres

A

O: Common flexor tendon from medial epicondyle of humerus and coronoid process of the ulna

I: Middle of lateral surface of radius

N: Median (C6-C7)

A: Pronate forearm, assist to flex the elbow

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14
Q

Flexor Pollicis Longus

(3rd layer)

A

O: Anterior surface of radius and interosseous membrane

I: Base of distal phalanx of thumb

N: Anterior interosseous nerve (Median; C7-T1)

A: Flex the thumb (IP, MCP, CMP joints); assists in wrist flexion

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15
Q

Palmaris Longus

A

O: Common flexor tendon from medial epicondyle of humerus

I: Flexor Retinaculum and palmar aponeurosis

N: Median (C6-T1)

A: Tense the palmar fascia, flex the wrist, may assist to flex elbow

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16
Q

Extensor Indicis

A

O: Posterior surface of ulna and interosseous membrane

I: Tendon of Extensor Digitorum at 2nd MCP

N: Posterior interosseous nerve (Radial; C6-C8)

A: Extend 2nd digit, adduct 2nd digit, assist w/ wrist extension

17
Q

Extensor Digiti Minimi

A

O: Lateral Epicondyle of Humerus (common extensor tendon)

I: Extensor expansion of 5th digit

N: Deep branch of Radial nerve (C7, C8)

A: Extends 5th digit at MCP and IP joints

18
Q

Extensor Digitorum

A

O: Lateral Epicondyle of Humerus (common extensor tendon)

I: Bases of middle and distal phalanges 2-5

N: Deep branch of Radial nerve (C6-C8)

A: Extend 2-5 fingers (MCP/IP joints), extend wrist

19
Q

Extensor Carpi Radialis Brevis

A

O: Lateral Epicondyle of Humerus (Common extensor tendon)

I: Base of 3rd metacarpal

N: Deep branch of radial nerve (C6-C8)

A: Extend, abduct wrist

20
Q

Anconeus

A

O: Lateral epicondyle of humerus

I: Olecranon process and posterior, proximal surface of ulna

N: Radial (C7, C8)

A: Extend the elbow (humeroulnar joint)

Anatomy (19 decks)

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