10 Muscles (Posterior Antebrachium) Flashcards
How many muscles are in the posterior antebrachium compartment?
11 muscles
6 superficial, and 5 deep
What are the muscles of the superficial layer of the anterior antebrachium compartment?
There are 6 muscles in the superficial layer:
Brachioradialis Extensor carpi radialis longus extensor carpi radialis brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris
What are the muscles of the deep layer of the posterior antebrachium?
There are 5 muscles in the deep layer:
abductor pollicis longus extensor pollicis brevis extensor pollicis longus extensor indicis supinator
Practice an oral presentation of the brachioradialis
PA: lateral supracondylar ridge of the humerus
DA: lateral surface of distal radius
A: flexes forearm (in mid prone position)
NS: radial nerve (C5-7)
Practice an oral presentation of the extensor carpi radialis longus
PA: lateral supracondylar ridge of the humerus
DA: base of 2nd MC bone
Actions: extension of the wrist, radial deviation
NS: radial nerve (C6-7)
Practice an oral presentation of the extensor carpi radialis brevis
PA: CEO (lateral epicondyle of humerus)
DA: base of 3rd MC bone
Actions: extends wrist, radial deviation
NS: deep branch of radial nerve (C7-8)
practice an oral presentation of the extensor digitorum muscle
PA: CEO (lateral epicondyle of the humerus)
DA: extensor expansions of digits 2-5
Actions: extends digits 2-5 at MCPs, extension of fingers, extension of wrist
NS: deep branch of the radial nerve (C7-8)
practice an oral presentation of the extensor digiti minimi muscle
PA: CEO (lateral epicondyle of the humerus)
DA: extensor expansion 5th digit
Actions: extends 5th digit at MCPs and IPJs
NS: deep branch of the radial nerve (C7-8)
practice an oral presentation of the extensor carpi ulnaris muscle
There are two heads to the extensor carpi ulnaris: the humeral head and the ulnar head
PA:
humeral head: CEO (lateral epicondyle of the humerus)
ulnar head: posterior border of the ulnar
DA: base of the 5th MC bone
Actions: extension of the wrist, ulnar deviation
NS: deep branch of the radial nerve (C7-8)
practice an oral presentation of the abductor pollicis longus muscle
PA: posterior surface of radius and ulna and adjacent interosseous membrane
DA: base of 1st MC
Actions: abducts thumb and extends thumb at CMC joint
NS: posterior interosseous nerve (C7-8)
practice an oral presentation of the extensor pollicis brevis muscle
PA: posterior distal third of the radius and adjacent interosseous membrane
DA: base of proximal phalanx of the thumb
Actions: extends proximal phalanx of the thumb and extends CMC joint
NS: posterior interosseous nerve (C7-8)
practice an oral presentation of the extensor pollicis longus muscle
PA: posterior surface of ulna and adjacent interosseous membrane
DA: base of distal phalanx of the thumb
Actions: extension of the thumb at the distal phalanx, MCP and CMC
NS: posterior interosseous nerve (C7-8)
practice an oral presentation of the extensor indicis muscle
PA: posterior distal third of the ulna and interosseous membrane
DA: extensor expansion 2nd digit
Action: extends 2nd digit
NS: posterior interosseous nerve (C7-8)
practice an oral presentation of the supinator muscle
There are 4 proximal attachments for the supinator muscle:
PA: CEO radial collateral and annular ligaments supinator fossa crest of the ulna
DA: proximal third of the radius (lateral, anterior and posterior surfaces)
Action: supinates forearm
NS: deep branch of the radial nerve (C7-8)
Which nerves innervate the muscles of the anterior antebrachium?
Radial nerve:
brachioradialis
extensor carpi radialis longus
Deep branch of the radial nerve: extensor carpi radialis brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris supinator
Posterior interosseous nerve: abductor pollicis longus extensor pollicis brevis extensor pollicis longus extensor indicis
