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Anatomy > Lecture 12: Wrist complex > Flashcards

Lecture 12: Wrist complex Flashcards

1
Q

Flexion percentages at each joint

A

40% and radiocarpal joint

60% at midcarpal joint

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2
Q

Radiocarpal arteries

A

Arise from dorsal and palmar carpal arches

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3
Q

Pisiform

A

Sesamoid bone

Forms in tendon of the flexor carpi ulnaris

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4
Q

Scaphoid

A

Forms floor of anatomical snuff box
Most commonly fractured, fractures may compromise radial artery in snuff box
Articulates with radius

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5
Q

______ runs in the floor of the snuff box over the scaphoid

A

Radial artery

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6
Q

Palmar structure sequence (radial to ulnar)

A 
Radius
Radial artery
Flexor carpi radialis tendon
Median nerve (under palmaris longus tendon)
Flexor digitorum superficialis tendons
Ulnar artery
Ulnar nerve
Flexor carpi ulnaris tendon
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7
Q

Branches of the __________ are in the roof of the snuff box

A

Superficial radial nerve

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8
Q

Radiocarpal joint ligaments

A

Lateral collateral ligament
Medial collateral ligament
Dorsal radiocarpal ligament
Palmar radiocarpal ligament

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9
Q

Metacarpal bones #

A

5 bones

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10
Q

Proximal bones of wrist

A

Scaphoid
Lunate
Triquetral
Pisiform

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11
Q

Radiocarpal movements

A

Some flexion/extension

Ulnar deviation

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12
Q

Collateral ligaments of wrist/hand/digits

A

Radial
Ulnar
Phalangeal

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13
Q

Extensor pollicis longus proximal attachment

A

Posterior surface of middle 1/3 of ulna and interosseous membrane

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14
Q

Extensor pollicis longus distal attachment

A

Dorsal aspect of base of distal phalanx of thumb

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15
Q

Lunate

A

Articulates with radius

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16
Q

Radiocarpal joint articulates with

A

Scaphoid
Lunate
Distal radius
Triquetral (only during extreme ulnar deviation)

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17
Q

Extensor pollicis brevis distal attachment

A

Dorsum of proximal phalanx of thumb

18
Q

Phalanges bone #

A

14 bones

19
Q

Extensor pollicis longus innervation

A

Posterior interosseous artery

20
Q

Extensor pollicis brevis proximal attachment

A

Posterior surface of distal 1/3 of radius and interosseous membrane

21
Q

Radiocarpal joint injuries

A 
Colles fracture
Scaphoid fracture (compromises radial artery)
22
Q

Extension percentages at each joint

A

33% at midcarpal joint

67% and radiocarpal joint

23
Q

Abductor pollicis longus blood supply

A

Posterior interosseous artery

24
Q

Extensor pollicis brevis function and blood/nerve supply

A

Extends proximal phalanx of thumb at its metacarpophalangeal joint, also extends carpometacarpal joint
Posterior interosseous nerve/artery

25
Q

Radiocarpal joint

A

Condyloid synovial

2 degrees of freedom

26
Q

Carpal bones #

A

8 bones

27
Q

Radiocarpal nerve supply

A

Anterior interosseous branch from median
Posterior interosseous branch from radial
Dorsal and deep branches of ulnar nerve

28
Q

Extensor pollicis longus blood supply

A

Posterior interosseous artery

Perforating branch of anterior interosseous arteries

29
Q

Abductor pollicis longus actions

A

Abducts thumb and extends it at the carpometacarpal joint

30
Q

Abductor pollicis longus distal attachment

A

Base of first metacarpal

31
Q

Midcarpal joint ligaments

A

Dorsal ligaments
Palmar ligaments
Interosseous ligaments

32
Q

Midcarpal joint arteries

A

Arise from dorsal and palmar carpal arches

33
Q

Extensor pollicis longus actions

A

Extends distal phalanx of thumb and extends metacarpophalangeal and carpometacarpal joints

34
Q

Tendons that define the anatomical snuff box

A

Extensor pollicis longus- dorsal and more medial
Extensor pollicis brevis- palmar border
Abductor pollicis longus- runs with extensor pollicis brevis

35
Q

Abductor pollicis longus nerve supply

A

Posterior interosseous nerve

36
Q

Movements of midcarpal joint

A

Some flexion/extension
Radial deviation (abduction)
-Especially due to movement of head of capitate in its socket

37
Q

Abductor pollicis longus proximal attachment

A

Posterior surface of proximal half of ulna, radius and interosseous membrane

38
Q

Other ligaments of wrist/hand/digits

A 
Carpal ligaments
Metacarpal ligaments
Carpometacarpal ligaments
Palmar ligaments
Intermetacarpal ligaments
39
Q

Midcarpal joint nerves

A

Anterior interosseous branch from median
Posterior interosseous branch from radial
Dorsal and deep branches of ulnar nerve

40
Q

Triquetral

A

Articulates with ulna via ulnar disc during extreme ulnar deviation

Anatomy (34 decks)

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