Superficial and deep muscles of posterior forearm Flashcards

1
Q

What are the 5 deep muscles of the posterior forearm?

A

supinator
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
extensor indicis proprius

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2
Q

What nerve supplies all of the muscles in the posterior forearm?

A

Radial nerve

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3
Q

Where is brachioradialis, and what are its origin and attachment sites?

A

7, brachioradialis originates from lateral supracondylar ridge of humerus and attaches to distal, lateral surface of radius just before radial styloid process

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4
Q

What is the action of the brachioradialis?

A

Elbow flexion

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5
Q

Where is extensor carpi radialis longus, and what are its origin and attachment sites?

A

1, it originates from lateral supracondylar ridge of humerus and becomes a tendon to attach to base of 2nd metacarpal

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6
Q

What are the 2 actions of extensor carpi radialis longus?

A

Wrist abduction
Wrist extension

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7
Q

Where is extensor carpi radialis brevis, and what are its origin and attachment sites?

A

2, originates from lateral epicondyle of humerus and becomes a tendon to attach to base of 3rd metacarpal

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8
Q

What are the 2 actions of extensor carpi radialis brevis?

A

Wrist abduction
Wrist extension

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9
Q

Where is extensor digitorum communis, and what are the origin and attachment sites?

A

10, originates from lateral epicondyle of humerus than splits into 4 tendons in distal forearm, each tendon attaches to extensor hood of a finger

Extensor hood surrounds distal metacarpal head and proximal phalange

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10
Q

What are the 2 actions of extensor digitorum communis?

A

Extension of metacarpophalangeal joints

Extension of interphalangeal joints

(Main extensor of fingers)

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11
Q

Where is extensor digiti minimi, and what are the origin and attachment sites?

A

9, originates from lateral epicondyle of humerus and joins with extensor digitorum tendon to attach to extensor hood of little finger

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12
Q

What are the 2 actions of extensor digiti minimi?

A

Extension of little finger (main action)

Wrist extension (weak action)

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13
Q

Where is extensor carpi ulnaris, and what are the origin and attachment sites?

A

8, originates from lateral epicondyle of humerus and attaches to base of 5th metacarpal

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14
Q

What are the 2 actions of extensor carpi ulnaris?

A

Wrist extension

Wrist adduction

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15
Q

Where is anconeus, and what are the origin and attachment sites?

A

11, originates from lateral epicondyle of humerus and attaches to posterolateral surface of olecranon process

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16
Q

What are the 2 actions of anconeus?

A

Elbow extension

Ulnar abduction during pronation of forearm

17
Q

Where is supinator, and what are its origin and attachment sites?

A

6, One head originates from lateral epicondyle of humerus and other head originates from ulna posterior surface

Attaches to posterior radial surface

18
Q

What muscle makes up the floor of the cubital fossa?

A

Supinator

19
Q

What is the action of supinator?

A

Forearm supination

20
Q

Where is abductor pollicis longus, and what are the origin and attachment sites?

A

3, originates from interosseus membrane and posterior surfaces of radius and ulna, attaches to lateral side of 1st metacarpal base

Contributes to lateral border of anatomical snuffbox

21
Q

What is the action of abductor pollicis longus?

A

Thumb abduction

22
Q

Where is extensor pollicis brevis, and what are its origin and attachment sites?

A

4, originates from radial posterior surface and attaches to base of thumb proximal phalange

Immediately distal to abductor pollicis longus

Forms lateral border of anatomical snuffbox

23
Q

What are the 2 actions of extensor pollicis brevis?

A

Extension of thumb metacarpophalangeal joint

Extension of thumb carpometacarpal joint

24
Q

Where is extensor pollicis longus, and what are its origin and attachment sites?

A

originates from posterior ulnar surface and attaches to distal phalange of thumb

Forms medial border of anatomical snuffbox

25
Q

What is the action of extensor pollicis longus?

A

Extends all joints of the thumb: carpometacarpal, metacarpophalangeal and interphalangeal

26
Q

Where is extensor indicis proprius, and what are the origin and attachment sites?

A

12, originates from posterior ulnar surface and attaches to extensor hood of index finger

Immediately distal to extensor pollicis longus

27
Q

What is the action of extensor indicis proprius?

A

Extension of index finger

Independent of other fingers during extension as this tendon only attaches to index finger

28
Q

What structures make up the borders and floor of anatomical snuffbox/radial fossa?

A

Lateral border is extensor pollicis brevis, contribution from abductor pollicis longus

Medial border is extensor pollicis longus

Floor is trapezium and scaphoid bones

29
Q

What are the superficial muscles of the posterior forearm?

A

Brachioradialis
Extensor digitorum communis
Extensor digitorum minimi
Extensor carpi ulnaris
Extensor carpi radialis brevis
Extensor carpi radialis longus
Anconeus