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MSK Post-midterm > Posterior Forearm > Flashcards

Posterior Forearm Flashcards

1
Q

Extensor carpi radialis longus

A

Origin: lateral supracondylar ridge of humerus

Insertioin: dorsal aspect of base of 2nd metacarpal

Axns: extend and abduct hand at wrist

Blood: Radial collateral artery
radial recurrent ar.
recurrent interosseous
posterior interosseous ar

Nerve: radial nerve (C6, C7)

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2
Q

Extensor carpi radialis brevis

A

Origin: lateral epicondyle of humerus (common extensor origin)

Insertion: dorsal aspect of base of 3rd metacarpal

Axns: extend hand
abduct hand at wrist

Blood: radial collateral
radial recurrent
recurrent interosseous
post. interosseous

Nerve: deep branch of radial nerve (C7, C8)

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3
Q

Extensor digitorum

A

Origin: lateral epicondyle of humerus (common)

Insertion: extensor expansions of medial 4 fingers

Axns: extends medial 4 fingers at MCP joint
some at IP joints

Blood: post. interosseous ar
Recurrent interosseous ar
perforating branch of an. interosseous ar

Nerve: posterior interosseous nerve (C7, C8): continuation of deep branch of radial nerve

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4
Q

Extensor digiti minimi

A

Origin: lateral epicondyle of humerus

Insertion: extensor expansion of 5th finger

Axn: extend 5th finger at MCP and at IP joint

Blood: post. interosseous
recurrent interosseous
perforating branch of ant. interosseous

Nerve: post. interosseous nerve C7, C8

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5
Q

Extensor carpi ulnaris

A

Origin: lateral epicondyle of humerus
post. border of ulna (medial)

Insertion: dorsal base of 5th metacarpal

Axns: extends and adducts hand at wrist

Blood: radial collateral, radial recurrent, recurrent interosseous
post. interosseous ar

Nerve: posterior interosseous nerve (C7, C8)

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6
Q

Deep Extensors:

A 
Supinator
Extensor indicis
Abductor pollicis longus
Extensor pollicis longus
extensor pollicis brevis
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7
Q

Supinator

A

Origin: lateral epicondyle of humerus
radial collateral and anular ligaments
ulnar crest

Insertion: prox. 1/3 of radius (nearly all surfaces, as it wraps around the bone)

Axns: supinates forearm, bringing radius back to anatomical postition

Blood: radial a
post. interosseous
radial recurrent
recurrent interosseous
middle collateral

Nerve: deep branch of radial nerve (C7, C8)

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8
Q

Extensor indicis

A

Origin: post. surface of distal 1/3 of ulna and interosseous membrane

Insertion: extensor expansion of 2nd finger

Axns: independent extension of 2nd finger, but also helps w/ extension of wrist

Blood: post. interosseous and perforating branch of ant. interosseous ar

Nerve: post. interosseous Nerve

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9
Q

Abductor pollicis longus (outcropping)

A

Origin: post. surface of prox. 1/2 of ulna and radius; interosseous membrane

Insertion: base of 1st metacarpal

Axns: abducts thumb and extends it at CMC joint

Blood: post. interosseous a

Nerve: post interosseous nerve (C7, C8)

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10
Q

Extensor pollicis brevis

A

Origin: post. surface of distal 1/3 of radius
interosseous membrane

Insertion: dorsal aspect of prox. phalanx of thumb

Axns: extends prox. phalanx of thumb at its MCP joint
extends CMC joint

Blood:Post. interosseous and perforating branch of anterior interosseous a

Nerve: post. interosseous nerve

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11
Q

Extensor Pollicis Longus

A

Origin: post. surface of middle 1/3 of ulna
interosseous membrane

Insertion: dorsal aspect of base of distal phalanx of thumb

Axns: extends distal phalanx of thumb at its interphalangeal joint
extends the MCP and CMC joint

Blood: post. interosseous and perforating branch of anterior interosseous a.

Nerve: posterior interosseous nerve

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12
Q

Brachioradialis

A

Origin: prox. 2/3 of supraepicondylar ridge of humerus

Insertion: distal radius: prox. to styloid process

Axns: flex forearm when pronated (mid prone or neutral)

Blood: radial collateral
recurrent radial
radial a.

Nerve: radial nerve (C5, 6, 7)

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13
Q

Posterior Compartment

A

Radial Nerve via:

Deep branch

OR

Posterior interosseous nerve

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14
Q

Radial Nerve

A

superficial branch and dorsal digital branches

Lateral Dorsal half of hand (anatomical position

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15
Q

Radialis (superficial lateral Group)

A

Brachioradioradialis

Extensor carpi radialis longus

Extensor carpi radialis brevis

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16
Q

Superficial group

A

Extensor carpi ulnaris

Extensor digiti minimi

Extensor digitorum

17
Q

Deep Group

A

Extensor pollicis longus

Extensor indicis

Extensor pollicis brevis

Abductor pollicis longus

Supinator

18
Q

Radial Nerve muscles

A

Brachioradialis

Extensor carpi radialis longus

19
Q

Deep radial nerve muscles

A

Extensor carpi radialis brevis

Supinator

20
Q

Posterior interossesous nerve

A

Extensor carpi ulnaris

Extensor digitorum

Extensor digiti minimi

Extensor indicis

Abductor pollicis longus

Extensor pollicis longus

Extensor pollicis brevis

21
Q

Superficial radial nerve

A

Sensation of lateral half of dorsal wrist, hand, thumb

22
Q

Brachioradialis

A

Origin: supraepicondylar ridge of humerus

Insertion: distal radius

Axns: flexes forearm (mid prone or neutral position)

Blood: radial collateral
recurrent radial
radial arteries

Nerve: Radial (C5, 6, 7)

23
Q

Extensor Expansion and Extensor Hood Mechanism

A

Extensor digitorum contracts
pulls extensor hood (extensor expansion)

causes IP joints to extend

Lumbricals attach to this expansion at the hood (also able to extend IP joints)

24
Q

Arterial Supply to posterior forearm and hand

A

Radial artery: via deep palmar arch (hand)
via dorsal carpal arch (hand)

Common interosseous artery
posterior interosseous artery

Perforating (posterior) branch of anterior interosseous artery

25
Q

Innervation of posterior forearm

A

radial nerve

superficial branch of radial n
lateral, runs beneach brachioradialis

deep branch
posterior, becomes post. interosseous nerve

26
Q

Radial Nerve Injury

A

fracture to humeral shaft

paralysis of extensors of wrist and fingers

flexors take over (wrist drop)

27
Q

Anatomical Snuff Box

A

Extensor poliicis longs (ulnar/medial border)

Extensor pollicis brevis (radial lateral border)

Abductor pollicis longus (runs w/ EPB ^)

MSK Post-midterm (10 decks)

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