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anatomy > muscles of forearm > Flashcards

muscles of forearm Flashcards

1
Q

fascial compartments of forearm

A

anterior

posterior

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2
Q

Layers of muscles in anterior forearm

A

superficial
intermediate
deep

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3
Q

anterior superficial muscles of forearm

A

pronator teres (ulnar and humeral heads)

flexor carpi radialis

palmaris longus

flexor carpi ulnaris (ulnar and humeral heads)

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4
Q

anterior intermediate muscles of forearm

A

flexor digitorum superficialis (humero-ulnar and radial heads)

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5
Q

anterior deep muscles of forearm

A

flexor digitorum profundus (medial and lateral parts)

flexor pollicis longus

pronator quadratus

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6
Q

origin / insertion / innervation / action of pronator teres (SUP)

A

origin: coronoid process of ulnar (ulnar head) AND medial humeral epicondyle (humeral head)
insertion: middle of convexity of lateral radial surface
innervation: median nerve (C6, C7!)
action: pronates/flexes forearm at elbow

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7
Q

origin / insertion / innervation / action of flexor carpi radialis (SUP)

A

origin: medial epicondyle of humerus
insertion: base of 2nd metacarpal
innervation: median nerve (C6, C7!)
action: flexes/abducts hand at wrist

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8
Q

origin / insertion / innervation / action of palmaris longus (SUP)

A

origin:
insertion: distal half of flexor retinaculum AND apex of palmar aponeurosis

innervation: median nerve (C7, C8)
action: flexes hand at wrist AND tenses palmar aponeurosis

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9
Q

origin / insertion / innervation / action of flexor carpi ulnaris (SUP)

A

origin: medial epicondyle of humerus (humeral h.) AND olecranon/posterior ulnar border (ulnar h.)
insertion: psisform / hook of hamate / 5th metcarpal
innervation: ulnar nerve (C7, C8!)
action: flexes/adducts hand at wrist

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10
Q

origin / insertion / innervation / action of flexor digitorum superficialis (INT)

A

origin: medial epicondyle of humerus (humero-ulnar h.) AND superior half of anterior radial border (radial h.)
insertion: shafts of middle phalanges of medial 4 digits
innervation: median nerve (C7, C8, T1)
action: flexes middle phalanges at proximal interphalangeal joints (and sometimes at metacarpophalangeal joints)

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11
Q

origin / insertion / innervation / action of flexor digitorum profundus (DEEP)

A

origin: proximal 3/4 of medial and anterior ulnar surfaces AND interosseous membrane (both medial and lateral)
insertion: bases of distal phalanges (medial = 4th and 5th, lateral = 2nd and 3rd)
innervation: ulnar nerve (C8, T1!) = MEDIAL / anterior interosseous nerve, from median nerve (C8!, T1) = LATERAL
action: flexes distal phalanges at distal interphalangeal joints

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12
Q

origin / insertion / innervation / action of flexor pollicis longus (DEEP)

A

origin: anterior radial surface and adjacent interosseous membrane
insertion: base of distal phalanx of thumb
innervation: anterior interosseous nerve, from median nerve (C8!, T1)
action: flexes phalanges of 1st digit (thumb)

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13
Q

origin / insertion / innervation / action of pronator quadratus (DEEP)

A

origin: distal 1/4 of anterior ulnar surface
insertion: distal 1/4 of anterior radial surface
innervation: anterior interosseous nerve, from median nerve (C8!, T1)
action: pronates forearm, deep fibres bind radius and ulna together

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14
Q

layers of muscles in posterior forearm

A

superficial
deep
outcropping

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15
Q

superficial muscles of posterior forearm (6)

A 
brachioradialis
extensor carpi radialis longus
extensor carpi radialis brevis
extensor digitorum
extensor digiti minimi
extensor carpi ulnaris
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16
Q

deep muscles of posterior forearm (2)

A

supinator

extensor indicis

17
Q

outcropping muscles of posterior forearm (3)

A

abductor pollicis longus
extensor pollicis longus
extensor pollicis brevis

18
Q

origin / insertion / innervation / action of brachioradialis (SUP)

A

origin: proximal 2/3 of supra-epicondylar ridge of humerus
insertion: lateral surface of distal end of radius (proximal to styloid process)
innervation: radial nerve (C5, C6!, C7)
action: weak flexion of forearm (stronger when forearm is in mid-pronated position)

19
Q

origin / insertion / innervation / action of extensor carpi radialis longus (SUP)

A

origin: lateral supra-epicondylar ridge of humerus
insertion: dorsal aspect of base of 2nd metacarpal
innervation: radial nerve (C6, C7)
action: extension/abduction at the wrist joint AND is active during fist clenching

20
Q

origin / insertion / innervation / action of extensor carpi radialis brevis (SUP)

A

origin: lateral epicondyle of humerus
insertion: dorsal aspect of base of 3rd metacarpal
innervation: deep branch of radial nerve (C7!, C8)
action: extension/abduction at the wrist joint

21
Q

origin / insertion / innervation / action of extensor digitorum (SUP)

A

origin: lateral epicondyle of humerus
insertion: extensor expansions of medial 4 digits
innervation: deep branch of radial nerve (C7!, C8)
action: extends medial 4 digits at (primarily) metacarpophalangeal joints AND (secondarily) at interphalangeal joints

22
Q

origin / insertion / innervation / action ofextensor digiti minimi (SUP)

A

origin: lateral epicondyle of humerus
insertion: extensor expansion of 5th digit
innervation: deep branch of radial nerve (C7!, C8)
action: extends 5th digit at (primarily) metacarpophalangeal joints AND (secondarily) at interphalangeal joint

23
Q

origin / insertion / innervation / action of extensor carpi ulnaris

A

origin: lateral epicondyle of humerus AND posterior ulnar border via shared aponeurosis
insertion: dorsal aspect of base of 5th metacarpal
innervation: deep branch of radial nerve (C7!, C8)
action: extends/adducts hand at wrist joint AND active during fist clenching

24
Q

origin / insertion / innervation / action of supinator (DEEP)

A

origin: lateral epicondyle of humerus / radial collateral and anular ligaments / supinator fossa / crest of ulna
insertion: lateral/posterior/anterior surfaces of proximal 1/3 of radius
innervation: deep branch of radial nerve (C7, C8!)
action: supinates forearm AND rotates radius to turn palm anteriorly/superiorly (if elbow is flexed)

25
Q

origin / insertion / innervation / action of extensor indicis (DEEP)

A

origin: posterior surface of distal 1/3 of ulna AND interosseous membrane
insertion: extensor expansion of 2nd digit
innervation: posterior interosseous nerve (C7!, C8)
action: extends 2nd digit AND helps extend hand at wrist

26
Q

origin / insertion / innervation / action of abductor pollicis longus (OUT)

A

origin: posterior surface of proximal halves of ulna / radius AND interosseous membrane
insertion: base of 1st metacarpal
innervation: posterior interosseous nerve (C7, C8!)
action: abducts thumb AND extends it at carpometacarpal joint

27
Q

origin / insertion / innervation / action of extensor pollicis longus (OUT)

A

origin: posterior surface of middle 1/3 of ulna AND interosseous membrane
insertion: dorsal aspect of base of distal phalanx of thumb
innervation: posterior interosseous nerve (C7, C8!)
action: extends distal phalanx of thumb at interphalangeal joint AND extends metacarpophalangeal and carpometacarpal joints

28
Q

origin / insertion / innervation / action of extensor pollicis brevis (OUT)

A

origin: posterior surface of distal 1/3 of radius AND interosseous membrane
insertion: dorsal aspect of base of proximal phalanx of thumb
innervation: posterior interosseous nerve (C7, C8!)
action: extends proximal phalanx at metacarpophalangeal joint AND extends carpometacarpal joint

anatomy (8 decks)

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