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MJM > Muscles Of The Forearm > Flashcards

Muscles Of The Forearm Flashcards

1
Q

Flexor carpi ulnaris

A

Superficial layer anterior
Origin: humeral head: medial epicondyle of humerus, ulnar head: olecranon and posterior border of ulna
Insertion: pisiform bone and then via pisohamate and pisometacarpal ligaments into the hamate and base of metacarpal v
Innervation: ulnar nerve C7,C8,T1
Function: flexes and adducts wrist joint

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2
Q

Palmaris longus

A

Superficial layer anterior
Origin: medial epicondyle of humerus
Insertion: palmar aponeurosis of hand
Innervation: median nerve C7,C8
Function: flexes wrist joint because the palmar aponeurosis anchors skin of hand, contraction of the muscle resists shearing forces when gripping

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3
Q

Flexor carpi radialis

A

Superficial anterior
Origin: medial epicondyle of humerus
Insertion: base of the metacarpals II and III
Innervation: median nerve C6,C7
Function: flexes and abducts the wrist

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4
Q

Pronator teres

A

Superficial anterior
Origin: humeral head- medial epicondyle and adjacent supraepicondylar ridge. Ulnar head- medial side of coronoid process
Insertion: roughening on lateral surface mid shaft of radius
Innervation: median nerve C6,C7
Function: pronation

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5
Q

Flexor digitorum superficialis

A

Intermediate anterior
Origin: humero-ulnar head-medial epicondyle of humerus and adjacent margin of coronoid process, radial head- oblique line of radius
Insertion: 4 tendons which attach to palmar surfaces of the middle phalanges of index, middle, ring and little fingers
Innervation: median nerve C8,T1
Function: flexes the proximal interphalangeal joints of index, middle, ring and little fingers can also flex the metacarpophalangeal joints of same fingers and the wrist joint

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6
Q

Flexor digitorum profundus

A

Deep anterior
Origin: anterior and medial surfaces of ulna and anterior medial half of interosseous membrane
Insertion: 4 tendons which attach to the palmar surfaces of the distal phalanges of index, middle, ring and little fingers
Innervation: lateral half by median nerve (anterior interosseous nerve), medial half by ulnar nerve C8,T1
Function: flexes distal interphalangeal joints of index, middle, ring and little fingers can also flex metacarpophalangeal joints of same fingers and flex the wrist

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7
Q

Flexor pollicis longus

A

Deep anterior
Origin: anterior surface of radius and radial half of interosseous membrane
Insertion: palmar surface of base of distal phalanx of thumb
Innervation: median nerve (anterior interosseous membrane) C7 C8
Function: flexes interphalangeal joints of the thumb can also flex the metacarpophalangeal joint of thumb

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8
Q

Pronator quadratus

A

Deep anterior
Origin: linear ridge on distal anterior surface of ulna
Insertion: distal anterior surface of radius
Innervation: median nerve (anterior interosseous nerve) C7 C8
Function: pronation

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9
Q

Brachioradialis

A

Posterior superficial
Origin: proximal part of lateral supraepicondylar ridge of humerus and adjacent intermuscular septum
Insertion: lateral surface of distal end of radius
Innervation: radial nerve C5 C6 before division into deep and superficial branches
Function: accessory flexor of elbow joint when forearm is mid pronated

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10
Q

Extensor carpi radialis longus

A

Posterior compartment superficial
Origin: distal part of lateral supraepicondylar ridge of humerus and adjacent intermuscular septum
Insertion: dorsal surface of base metacarpal II
Innervation: radial nerve C6 C7 before division into superficial and deep branches
Function: extends and abducts wrist

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11
Q

Extensor carpi radialis brevis

A

Posterior superficial
Origin: lateral epicondyle of humerus and adjacent intermuscular septum
Insertion: dorsal surface of base of metacarpals II and III
Innervation: deep branch of radial nerve C7 C8 before penetrating supinator
Function: extends and abducts wrist

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12
Q

Extensor digitorum

A

Posterior superficial
Origin: lateral epicondyle of humerus and adjacent intermuscular septum and deep fascia
Insertion: 4 tendons insert via extensor hoods into dorsal aspect of the bases of the middle and distal phalanges of index, middle, ring and little fingers
Innervation: posterior interosseous nerve C7 C8
Function: extends the index, middle, ring and little finger can also extend wrist

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13
Q

Extensor digiti minimi

A

Posterior superficial
Origin: lateral epicondyle of humerus and adjacent intermuscular septum together with extensor digitorum
Insertion: extensor hood of little finger
Innervation: posterior interosseous nerve C7 C8
Function: extends little finger

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14
Q

Extensor carpi ulnaris

A

Posterior superficial
Origin: lateral epicondyle of humerus and posterior border of ulna
Insertion: tubercle on the base of medial side metacarpal v
Innervation: posterior interosseous nerve C7 C8
Function: extends and adducts the wrist

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15
Q

Anconeus

A

Posterior superficial
Origin: lateral epicondyle of humerus
Insertion: olecranon and proximal posterior surface of ulna
Innervation: radial nerve C6, C7,C8 via branch to medial head of triceps brachii
Function: abduction of the ulna in pronation, accessory extensor of elbow joint

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16
Q

Supinator

A

Posterior and deep
Origin: superficial layer- lateral epicondyle of humerus, radial collateral and annular ligaments, deep layer- supinator crest of ulna
Insertion: lateral surface of radius superior to anterior oblique line
Innervation: posterior interosseous nerve C6 C7
Function: supination

17
Q

Abductor pollicis longus

A

Posterior deep
Origin: posterior surfaces of Ulna and radius distal to attachments of supinator and anconeus, and intervening interosseous membrane
Insertion: lateral side of base of metacarpal I
Innervation: posterior interosseous nerve C7 C8
Function; abducts carpometacarpal joint of thumb, accessory extensor of thumb

18
Q

Extensor pollicis brevis

A

Posterior deep
Origin: posterior surface of radius distal to abductor pollicis longus and the adjacent interosseous membrane
Insertion: dorsal surface of base of proximal phalanx of thumb
Innervation: posterior interosseous nerve C7 C8
Function: extends metacarpophalangeal joint of thumb and can extend carpometacarpal joint

19
Q

Extensor pollicis longus

A

Posterior deep
Origin: posterior surface of ulna distal to abductor pollicis longus and the adjacent interosseous membrane
Insertion: dorsal surface of base of distal phalanx of thumb
Innervation: posterior interosseous nerve C7 C8
Function: extends interphalangeal joint of thumb can also extend carpometacarpal and metacarpophalangeal joints

20
Q

Extensor indices

A

Posterior deep
Origin: posterior surface of ulna distal to extensor pollicis longus and adjacent interosseous membrane
Insertion: extensor hood of index finger
Innervation: posterior interosseous nerve C7 C8
Fucntion: extends index finger

MJM (18 decks)

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