Lecture 12: Wrist Complex

Question 1

What does the scaphoid articulate with?

Answer 1

radius

Question 2

What does the lunate articulate with?

Answer 2

radius

Question 3

What does the triquetral articulate with?

Answer 3

ulna during extreme ulnar deviation

Question 4

What does the pisiform form?

Answer 4

tendon of flexor carpi ulnaris

Question 5

Entire wrist complex is enclosed in _____

Answer 5

common synovial membrane

Question 6

What type of joints are the articulations

Answer 6

plane joints that form guiding motions

Question 7

How many bones make up the carpals (wrist)?

Answer 7

8 bones

Question 8

How many bones make up the metacarpals (hand)?

Answer 8

5 bones

Question 9

How many bones make up the phalanges (fingers)?

Answer 9

14 bones

Question 10

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

Answer 10

condyloid synovial; 2

Question 11

What are the articular surfaces of the radiocarpal joint?

Answer 11

scaphoid
lunate
distal radius
triquetral

Question 12

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

Answer 12

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

Question 13

What are related movements to the radiocarpal joint?

Answer 13

• Some flexion and extension

* Ulnar deviation

Question 14

What are the articular arteries of the radiocarpal joint?

Answer 14

• Arise from dorsal and palmar carpal arches

Question 15

What is the nerve supply from the radiocarpal joint?

Answer 15

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

Question 16

What is the mid carpal joint made up of?

Answer 16

inter carpal joints

Question 17

What is the midcarpal joint enclosed in?

Answer 17

synovial capsule

Question 18

What are the movements of the midcarpal joint?

Answer 18

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

Question 19

What are the ligaments of the midcarpal joint?

Answer 19

• Dorsal ligaments.
• Palmar ligaments.
• Interosseous ligaments.

Question 20

What are the nerves and arteries of the midcarpal joint?

Answer 20

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

Question 21

What is the palmar structure sequence radial to ulnar?

lateral to medial

Answer 21

-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

Question 22

What are types of radiocarpal joint injuries?

Answer 22

colle’s fracture

scaphoid fracture

Question 23

What are the tendons that make up the anatomical snuff box?

Answer 23

extensor pollicis longus (dorsal and more medial)
extensor pollicis brevis (palmar border)
abductor pollicis longus (runs with extensor pollicis brevis)

Question 24

What is the floor of the snuff box?

Answer 24

scaphoid

Question 25

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

Answer 25

superficial radial nerve

Question 26

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

Answer 26

radial

Question 27

The snuff box is the site for what?

Answer 27

radial pulse

Question 28

Abductor pollicis longus proximal attachment

Answer 28

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

Question 29

Abductor pollicis longus distal attachment

Answer 29

base of first metacarpal

Question 30

Abductor pollicis longus actions

Answer 30

abducts thumbs and extends it at the carpometacarpal joint

Question 31

Abductor pollicis longus blood supply

Answer 31

posterior interosseous artery

Question 32

Abductor pollicis longus innervation

Answer 32

posterior interossesous nerve (C7,8)

Question 33

Extensor pollicis brevis proximal attachment

Answer 33

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

Question 34

Extensor pollicis brevis distal attachment

Answer 34

dorsum of proximal phalanx of thumb

Question 35

Extensor pollicis brevis action

Answer 35

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

Question 36

Extensor pollicis brevis blood supply

Answer 36

posterior interosseous artery

Question 37

Extensor pollicis brevis innervation

Answer 37

posterior interosseous nerve (C7, C8)

Question 38

extensor pollicis longus proximal attachment

Answer 38

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

Question 39

extensor pollicis longus distal attachment

Answer 39

dorsal aspect of base of distal phalanx of thumb

Question 40

extensor pollicis longus actions

Answer 40

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

Question 41

extensor pollicis longus blood supply

Answer 41

posterior interosseous artery and perforating branch of anterior interosseous arteries

Question 42

extensor pollicis longus innervation

Answer 42

posterior interosseous nerve (C7, C8)