Posterior Compartment Of Forearm Muscles Flashcards

0
Q

What muscles make up the deep layer of the posterior compartment of the forearm?

A

Supinator is the only one not considered and “outcropping” muscle. The other deep muscles include, abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis, and extensor indicis

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1
Q

What muscles make up the superficial layer of the posterior compartment of the forearm?

A

Brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris

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2
Q

Origin of brachioradialis

A

Proximal two thirds of lateral supraepicondylar ridge of humerus

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3
Q

Insertion of brachioradialis

A

Lateral surface of distal end of radius proximal to styloid process

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4
Q

Innervation of brachioradialis

A

Radial nerve (c5,c6,c7)

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5
Q

Action of brachioradialis

A

Relatively weak flexion of elbow joint, maximal when forearm is in midpronated position

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6
Q

Origin of extensor carpi radialis longus

A

Lateral supra-epicondylar ridge of humerus

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7
Q

Insertion of the extensor carpi radialis longus

A

Dorsal aspect of base of 2nd metacarpal

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8
Q

Innervation of extensor carpi radialis longus

A

Radial nerve (c6 and c7)

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9
Q

Actions of extensor carpi radialis longus

A

Extend and abduct wrist joint

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10
Q

Origin of extensor carpi radialis brevis

A

Lateral epicondyle of humerus

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11
Q

Insertion of extensor carpi radialis brevis

A

Dorsal aspect of base of 3rd metacarpal

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12
Q

Innervation of extensor carpi radialis brevis

A

Deep branch of radial nerve (c7 and c8)

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13
Q

Actions of extensor carpi radialis brevis

A

Extend and abduct wrist joint, active during fist clenching

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14
Q

Origin of extensor digitorum

A

Lateral epicondyle of humerus

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15
Q

Insertion of extensor digitorum

A

Extensor expansions of medial four fingers

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16
Q

Innervation of extensor digitorum

A

Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve

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17
Q

Actions of extensor digitorum

A

Extend wrist joint, extend medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joint

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18
Q

Origin of extensor digiti minimi

A

Lateral epicondyle of humerus

19
Q

Insertion of extensor digiti minimi

A

Extensor expansion of 5th finger

20
Q

Innervation of extensor digiti minimi

A

Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve

21
Q

Actions of extensor digiti minimi

A

Extends wrist joint, extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

22
Q

Origin of extensor carpi ulnaris

A

Lateral epicondyle of humerus, and posterior border of ulna via a shared aponeurosis

23
Q

Insertion of extensor carpi ulnaris

A

Dorsal aspect of base of 5th metacarpal

24
Innervation of extensor carpi ulnaris
Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve
25
Actions of extensor carpi ulnaris
Extends and adducts wrist joint (also active during fist clenching)
26
Origin of supinator
Lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna
27
Insertion of supinator
Lateral, posterior, and anterior surfaces of proximal third of radius
28
Innervation of supinator
Deep branch of radial nerve (c7 and c8)
29
Actions of supinator
Supinates forearm, rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)
30
Origin of abductor pollicis longus
Posterior surface of proximal halves of ulna, radius, and interosseous membrane
31
Insertion of abductor pollicis longus
Base of 1st metacarpal
32
Innervation of abductor pollicis longus
Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve
33
Actions of abductor pollicis longus
Extends wrist joint; abducts thumb and extends it at carpometacarpal joint
34
Origin of extensor pollicis longus
Posterior surface of middle third of ulna and interosseous membrane
35
Insertion of extensor pollicis longus
Dorsal aspect of base of distal phalanx of thumb
36
Innervation of extensor pollicis longus
Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve
37
Actions of extensor pollicis longus
Extends wrist Extends distal phalanx of thumb at interphalangeal joint Extends metacarpophalangeal and carpometacarpal joints
38
Origin of extensor pollicis brevis
Posterior surface of distal third of radius and interosseous membrane
39
Insertion of extensor pollicis brevis
Dorsal aspect of base of proximal phalanx of thumb
40
Innervation of extensor pollicis brevis
Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve
41
Actions of extensor pollicis brevis
Extends wrist joint | Extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpo joint
42
Origin of extensor indicis
Posterior surface of distal third of ulna and interosseous membrane
43
Insertion of extensor indicis
Extensor expansion of 2nd finger
44
Innervation of extensor indicis
Posterior interosseous nerve (c7 and c8), continuation of deep branch of radial nerve
45
Actions of extensor indicis
Extends wrist joint Extends 2nd finger (enabling its independent extension) Helps extend hand at wrist