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Anatomy Exam 2: Lectures 8-15 > Lecture 12: Wrist Complex > Flashcards

Lecture 12: Wrist Complex Flashcards

1
Q

What does the scaphoid articulate with?

A

radius

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2
Q

What does the lunate articulate with?

A

radius

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3
Q

What does the triquetral articulate with?

A

ulna during extreme ulnar deviation

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4
Q

What does the pisiform form?

A

tendon of flexor carpi ulnaris

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5
Q

Entire wrist complex is enclosed in _____

A

common synovial membrane

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6
Q

What type of joints are the articulations

A

plane joints that form guiding motions

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7
Q

How many bones make up the carpals (wrist)?

A

8 bones

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8
Q

How many bones make up the metacarpals (hand)?

A

5 bones

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9
Q

How many bones make up the phalanges (fingers)?

A

14 bones

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10
Q

The radiocarpal joint is a ________ joint with ______ degrees of freedom

A

condyloid synovial; 2

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11
Q

What are the articular surfaces of the radiocarpal joint?

A

scaphoid
lunate
distal radius
triquetral

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12
Q

What are the ligaments of the radiocarpal joint that strengthen the capsule?

A
  • Lateral (radial) collateral ligament.
  • Medial (ulnar) collateral ligament.
  • Dorsal radiocarpal ligament.
  • Palmar radiocarpal ligament.
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13
Q

What are related movements to the radiocarpal joint?

A
  • Some flexion and extension

* Ulnar deviation

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14
Q

What are the articular arteries of the radiocarpal joint?

A

• Arise from dorsal and palmar carpal arches

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15
Q

What is the nerve supply from the radiocarpal joint?

A

anterior interosseous branch of median nerve
posterior interosseous branch of radial nerve
dorsal and deep branches of the ulnar nerve

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16
Q

What is the mid carpal joint made up of?

A

inter carpal joints

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17
Q

What is the midcarpal joint enclosed in?

A

synovial capsule

18
Q

What are the movements of the midcarpal joint?

A
  • Some flexion and extension
  • Radial deviation (abduction)
  • Especially due to movement of head of capitate in its socket
19
Q

What are the ligaments of the midcarpal joint?

A
  • Dorsal ligaments.
  • Palmar ligaments.
  • Interosseous ligaments.
20
Q

What are the nerves and arteries of the midcarpal joint?

A

anterior interosseous branch of median nerve
posterior interosseous branch of radial nerve
dorsal and deep branches of the ulnar nerve
• Arise from dorsal and palmar carpal arches

21
Q

What is the palmar structure sequence radial to ulnar?

lateral to medial

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
22
Q

What are types of radiocarpal joint injuries?

A

colle’s fracture

scaphoid fracture

23
Q

What are the tendons that make up 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)

24
Q

What is the floor of the snuff box?

A

scaphoid

25
Q

Branches of the _____ nerve are in the roof of the snuff box

A

superficial radial nerve

26
Q

The _____ artery runs in the floor of the snuff box over scaphoid

A

radial

27
Q

The snuff box is the site for what?

A

radial pulse

28
Q

Abductor pollicis longus proximal attachment

A

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

29
Q

Abductor pollicis longus distal attachment

A

base of first metacarpal

30
Q

Abductor pollicis longus actions

A

abducts thumbs and extends it at the carpometacarpal joint

31
Q

Abductor pollicis longus blood supply

A

posterior interosseous artery

32
Q

Abductor pollicis longus innervation

A

posterior interossesous nerve (C7,8)

33
Q

Extensor pollicis brevis proximal attachment

A

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

34
Q

Extensor pollicis brevis distal attachment

A

dorsum of proximal phalanx of thumb

35
Q

Extensor pollicis brevis action

A

extends proximal phalanx of thumb as its metacarpophalangeal joint, also extends carpometacarapal joint

36
Q

Extensor pollicis brevis blood supply

A

posterior interosseous artery

37
Q

Extensor pollicis brevis innervation

A

posterior interosseous nerve (C7, C8)

38
Q

extensor pollicis longus proximal attachment

A

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

39
Q

extensor pollicis longus distal attachment

A

dorsal aspect of base of distal phalanx of thumb

40
Q

extensor pollicis longus actions

A

extends distal phalanx of thumb at its interphalangeal joint and extends the metacarpophalangeal and carpometacarpal joint

41
Q

extensor pollicis longus blood supply

A

posterior interosseous artery and perforating branch of anterior interosseous arteries

42
Q

extensor pollicis longus innervation

A

posterior interosseous nerve (C7, C8)

Anatomy Exam 2: Lectures 8-15 (7 decks)

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