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MSK > Posterior Forearm, Wrist And Hand Anatomy > Flashcards

Posterior Forearm, Wrist And Hand Anatomy Flashcards

1
Q

What type of joint is the radiocarpal joint?

A

Condylar synovial joint

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2
Q

What movements can occur at the radiocarpal joint?

A

Flexion + Extension
Ulnar + radial deviation

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3
Q

What type of joint is the Metacarpophalangeal joint and the Interphalangeal joints?

A

Hinge joints

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4
Q

What is Abduction of the fingers?

What joint does it happen at?

A

Midline = middle of middle finger
Thumb and finger move in opposite directions away from the midline

Happens at Metacarpophalangeal joint

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5
Q

What is Adduction of the fingers?

What joint does it happen at?

A

Midline = middle of middle finger
Thumb and finger move in same direction towards the midline

Happens at Metacarpophalangeal joint

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6
Q

What special movement can happen at the fingers which uses a combination of movements?

A

Circumduction

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7
Q

What nerve innervates the posterior forearm (whole posterior upper limb)?

A

Radial nerve

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8
Q

What is the function of the posterior forearm muscles?

A

Extensors
(Supination)

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9
Q

What are the 2 parts of the posterior compartment of the forearm?

A

Superficial
Deep

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10
Q

What muscles are in the superficial layer of the posterior compartment of the forearm?

A

3 to wrist, 2 to hand and 2 to other in superficial layer:

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris

Extensor digitorum communis
Extensor digiti minimi

Brachioradialis
Anconeus

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11
Q

What is the origin and insertion of Brachioradialis?

A

Origin = lateral supracondylar ridge of humerus

Insertion = distal radius just proximal to Styloid process

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12
Q

What is the common extensor origin?

A

Lateral epicondyle of humerus

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13
Q

What is the function of Brachioradialis?

A

Flexes elbow

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14
Q

What is the origin of Extensor Carpi Radialis Brevis?

What is the origin of Extensor Carpi Radialis Longus?

A

ECRB = Lateral epicondyle (common extensor origin)

ECRL = supracondylar ridge of humerus

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15
Q

Where does Extensor Carpi Radialis Longus and Extensor Carpi Radialis Brevis insert?

A

Metacarpals II and III

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16
Q

What is the function of ECRB and ECRL?

A

Extension of wrist
Abduction of wrist

17
Q

What is the origin and insertion of Extensor digitorum (communis)?

A

Origin = lateral epicondyle

Inserts = middle + distal phalanx II-V

18
Q

What is the function of extensors digitorum?

A

Extends fingers II, III IV and V at the Metacarpophalangeal joint and Interphalangeal joint

19
Q

What is the origin and insertion of Extensor digiti minimi?

A

Origin = lateral epicondyle

Inserts = attaches with extensor digitorum tendon and inserts into extensor hood of little finger

20
Q

Where does extensor digit minimi come from?

A

It originates/comes off of the extensor digitorum muscle

21
Q

What is the function of extensor digiti minimi?

A

Extends little finger
Wrist extension

22
Q

What is the origin and insertion of Extensor carpi ulnaris?

A

Origin = lateral epicondyle

Insertion = metacarpal V

23
Q

What is the function of Extensor carpi ulnaris?

A

Wrist extension
Wrist Adduction

24
Q

What is the origin and insertion of Anconeus?

A

Origin = Lateral epicondyle (humerus)

Insertion = Olecranon (lateral surface of Olecranon of ulnar)

25
Q

What is the function of Anconeus?

A

Extends + stabilises elbow joint
Abducts ulna during forearm pronation

26
Q

What are all the muscles of the SUPERFICIAL posterior compartment of the forearm which originate at the common extensor origin/lateral epicondyle?

A

Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris
Anconeus

27
Q

What are the muscles of the deep layer of the Posterior forearm?

A

Supinator
Extensor indicis
Extensor pollicis longus
Extensor pollicis brevis
Abductor pollicis longus

28
Q

What is the origin and insertion of the Supinator?

A

Origin = Lateral epicondyle + ulnar

Insert = radius

29
Q

What is the function of Supinator?

A

Supination

30
Q

What is the origin and insertion of Abductor pollicis longus?

A

Origin = interosseous membrane

Inserts = metacarpal 1

31
Q

What is the action of abductor pollicis longus?

A

Thumb abduction

32
Q

What is the origin and insertion of extensor pollicis longus?

A

Origin = ulnar

Inserts = distal phalanx of thumb

33
Q

What is the action of extensor pollicis longus?

A

Extends all joints of thumb

34
Q

What is the origin and insertion extensor pollicis brevis?

A

Origin = radius

Insertion = proximal phalanx of thumb

35
Q

What is the action of extensor pollicis brevis?

A

Extends thumb at Metacarpophalangeal joint and Carpometacarpal joint

36
Q

What is the origin and insertion of extensor indicis?

A

Origin = ulnar

Insertion = extensor hood of index

37
Q

What is the action of extensor indicis?

A

Extends index finger

38
Q

What are the borders of the anatomical snuff box?

A

Remember LBL
Extensor pollicis Longus (Border closest to digits)
Extensor pollicis Brevis (Border closest to thumb)
Abductor pollicis Longus (Border right next to extensor pollicis brevis)

MSK (36 decks)

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