IFS Unit 7 - Hand and Wrist

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42 Terms

1
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How many carpal bones are there?

8

2
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What is the proximal articulation of the scaphoid?

the radius

3
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What is the proximal articulation of the lunate?

the radius

4
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What is the proximal articulation of the triquetrum?

articular disc of the distal radio-ulnar joint

5
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What kind of bone is the pisiform?

sesamoid bone

6
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What are the articulations of the trapezium?

1st and 2nd metacarpals, scaphoid, and trapezoid bone

7
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What are the articulations of the capitate?

4th and 5th metacarpals, scaphoid, and triquetrum bones

8
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What are the articulations of the hamate?

fourth and fifth finger

9
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Where is the Guyon's canal located and what is the purpose?

hamate bone and protects the ulnar artery, nerve, and vein

10
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What is the name for the proximal end of the metacarpal?

the base

11
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What is the articulation of the proximal end of the metacarpal?

the carpal bones

12
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What are the articulations of the distal heads of the metacarpals?

proximal phalanges

13
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What kind of joint is created by the trapezium and the 1st metacarpal?

saddle joint

14
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Why are there only 4 middle phalanx in the hand?

the thumb does not have one

15
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What bones articulate to form the medial metacarpophalangeal joint?

metacarpal and proximal phalanx

16
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What bones articulate to form the proximal metacarpophalangeal joint?

middle phalanx and proximal phalanx

17
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What bones articulate to form the lateral metacarpophalangeal joint?

middle phalanx and distal phalanx

18
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What bones articulate to form carpometacarpal joint?

metacarpals and carpal bones

19
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What bones articulate to form the radiocarpal joint?

radius and carpal bones

20
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What are the main components of synovial joints?

fibrosis layer of the capsule, hyaline cartilage, synovial membrane, space between the two bones, synovial fluid, disc

21
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Does the ulna articulate with the carpal bones?

no! it articulates with the articular disc which will articulate with carpal bones

22
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What are the attachments of the ulnar collateral ligament of the wrist?

styloid process to pisiform

23
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What are the attachments of the radial collateral ligament of the wrist?

styloid process to trapezium

24
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What are the attachments of the transverse carpal ligament of the wrist?

flexor retinaculum to carpal tunnel

25
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What muscle attaches to the flexor retinaculum and the tubercles of the scaphoid and trapexium, and the lateral side of the base of the proximal phalanx of the thumb?

abductor pollicis bravis

26
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What is the action of the abductor pollicis brevis?

abducts thumb and helps oppose it

27
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What nerve innervates all the muscles of the thenar compartment of the hand?

recurrent branch of the median nerve

28
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What muscle goes through the carpal tunnel to the recurrent median nerve?

flexor pollicis brevis

29
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Which thenar muscle flexes the thumb?

flexor pollicis brevis

30
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Which thenar muscle adducts the thumb toward the lateral border of the palm?

adductor pollicis

31
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What thenar muscles are innervated by the recurrent branch of the median nerve?

opponens pollicis, abductor pollicis brevis, and flexor pollicis brevis

32
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What thenar muscles are innervated by the deep branch of the ulnar nerve?

adductor pollicis

33
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Which hypothenar muscle attaches to the pisiform and the medial side of the base of the proximal phalanx of the 5th digit?

abductor digiti minimi

34
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Which hypothenar muscle attaches to the hook of hamate and flexor retinaculum and the medial side of the base of the proximal phalanx of the 5th digit?

flexor digiti minimi

35
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What is the action of the abductor digiti minimi?

abducts the 5th digits; assists in flexion of its proximal phalanx

36
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What is the action of the flexor digiti minimi?

flexes proximal phalanx of te 5th digit

37
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What is the action of the opponens digiti minimi?

draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb

38
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What lumbricals are innervated by the median nerve?

1st and 2nd

39
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What lumbricals are innervated by the ulnar nerve?

3rd and 4th

40
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What is the function of the extensor hood?

it is the force producing extension

41
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How many dorsal interossei are there? What is their function?

4, adduct to middle finger

42
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How many palmar interossei are there? What is their function?

3, abduct