Forearm - posterior compartment Flashcards Preview

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Flashcards in Forearm - posterior compartment Deck (37):
1

Posterior/extensor/supinator compartment of forearm - superficial

brachioradialis
extensor carpi radialis longus
extensor carpi radialis brevis
extensor digitorum
extensor digiti minimi
extensor carpi ulnaris

2

Posterior/extensor/supinator compartment of forearm - deep

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

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Attachments of brachioradialis

Proximal: proximal 2/3 of lateral supracondylar ridge of humerus
Distal: lateral, distal radius proximal to styloid

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Actions of brachioradialis

flexes forearm at elbow

5

Blood supply of brachioradialis

radial recurrent artery

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Innervation of brachioradialis

superficial branch of radial nerve (C5, C6, C7)

7

Attachments of extensor carpi radialis longus

Proximal: lateral supracondylar ridge of humerus
Distal: base of 2nd metacarpal

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Actions of extensor carpi radialis longus

extends and abducts hand at wrist

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Innervations of extensor carpi radialis longus

radial nerve (C6, C7)

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Attachments of extensor carpi radialis brevis

Proximal: lateral epicondyle of humerus
Distal: base of 3rd metacarpal

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Actions of extensor carpi radialis brevis

extends and abducts hand at wrist

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Innervations of extensor carpi radialis brevis

deep branch of radial nerve (C7, C8)

13

Attachments of extensor digitorum

Proximal: lateral epicondyle of humerus
Distal: extensor expansions of 2nd-5th digits

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Actions of extensor digitorum

extends digits 2-5 at MCPs and IPs (all finger joints)

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Innervation of extensor digitorum

deep branch of radial nerve (C7, C8)

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Attachments of extensor digiti minimi

Proximal: lateral epicondyle of humerus
Distal: extensor expansion of 5th digit

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Actions of extensor digiti minimi

extends 5th digit at MCP and IP (joints)

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Innervation of extensor digiti minimi

deep branch of radial nerve (C7, C8)

19

Attachments of extensor carpi ulnaris

Proximal: lateral epicondyle of humerus, posterior border of ulna
Distal: base of 5th metacarpal

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Actions of extensor carpi ulnaris

extends and adducts hand at wrist

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Innervation of extensor carpi ulnaris

deep branch of radial nerve (C7, C8)

22

Attachments of supinator

Proximal: lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa, crest of ulna
Distal: lateral posterior and anterior proximal third of radius

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Actions of supinator

supinates forearm

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Innervation of supinator

deep branch of radial nerve (C7, C8)

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Attachments of extensor indicis

Proximal: distal third ulna and posterior interosseuous membrane
Distal: extensor expansion of 2nd digit

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Actions of extensor indicis

extends 2nd digit and hand at wrist

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Innervation of extensor indicis

posterior interosseous nerve (C7, C8) from deep branch of radial nerve

28

Attachments of abductor pollicis longus

Proximal: proximal half of posterior ulna, radius, and interosseious membrane
Distal: base of 1st metacarpal

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Actions of abductor pollicis longus

abducts thumb and extends it at CMC joint

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Innervation of abductor pollicis longus

posterior interosseous nerve (C7, C8)

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Attachments of extensor pollicis longus

Proximal: middle third of posterior ulna and interosseous membrane
Distal: base of distal phalanx of thumb

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Actions of extensor pollicis longus

extends distal phalanx

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Innervation of extensor pollicis longus

posterior interosseous nerve (C7, C8)

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Innervation of extensor pollicis brevis

posterior interosseous nerve (C7, C8)

35

Attachments of extensor pollicis brevis

Proximal: distal third of posterior radius and interosseous membrane
Distal: base of proximal phalanx of thumb

36

Actions of extensor pollicis brevis

extends proximal phalanx

37

Origin of extensor mass

lateral epicondyle of humerus