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Flashcards in thursday lecture Deck (63):
1

Flexor Retinaculum

-spans area between pisiform, hamate, scaphoid, and trapezium
-transforms carpal arch into a tunnel
-Serves as attachent for thenar and hypothenar muscles
-helps hold down the flexor tensons (keeping things stable)

2

Guyon's Canal

-where the ulnar nerve and artery run
- on ulnar side of the wrist
-Transverse carpal ligament and volar carpal ligament protect the nerve and artery
-frequent site of nerve entrapment

3

Palmar Fascia

-continuation of deep fascia
-thick, tendinous, triangular

4

Fibrous digital sheaths

synovial sheaths that enclose the flexor tendons as they pass along the palmar aspect of each digit

5

Metacarpophalangeal joint (MCP)

-Condyloid synoival joint
-heads of metacarpals with base of proximal phalanges
-joint capsule enclosing each joint

6

Metacarpophalangeal joint ligament

Collateral ligament
-passes posterior to joint for flexion and extension
-taut in 70-90 degrees of flexion (on slack at any less then these degrees)

7

Motions of the metacarpophalangeal joint

flexion
extension
abduction
adduction
circumduction of digits 2-5

8

Blood supply to the metacarpophalageal joint

deep digital arteries arising from superfical palmar arches

9

Interphalangeal joints

-hinge synovial joint
-heads of phalanges with bases of the more distal phalanges
-motion: flexion and extension
-blood supply: digital arteries

10

PIP and DIP joint ligament

-lateral and accessory collateral ligaments
(taut in 25 degrees flexion)

11

Carpometacarpal joint (CMC)

-thumb
-saddle synovial joint
-base of 1st metacarpal with trapzium
-capsule is loose
-5 ligaments

12

the 5 ligaments of the CMC joint

-Radial and Ulnar collateral
-anterior and posterior oblique
-intermetacarpal

13

motions of the thumb

abduction
adduction
extension
flexion
opposition
repositions

14

Thumb Metacarpophalangeal joint

-hinge joint
-resembles IP joint
-flexion and extension
-has collateral and palmar ligaments

15

Thenar Muscles

-under the thumb
-Abductor Pollicis Brevis
-Flexor Pollicis Brevis
-Opponens Pollicis

16

Opponens Pollicis origin

flexor retinaculum

17

Opponens Pollicis insertion

lateral side of 1st meetacarpal

18

Opponens Pollicis innervation

Recurrent branch of median nerve

19

Opponens Pollicis action

Oppose thumb

20

Abductor Pollicis brevis origin

flexor retinaculum (in the web of the thumb)

21

Abductor Pollicis Brevis insertion

lateral side of base of proximal phalanx of thumb

22

Abductor Pollicis Brevis innervation

Recurrent branch of median nerve

23

Abductor Pollicis Brevis action

abducts the thumb

24

Flexor Pollicis Brevis origin

flexor retinaculum

25

Flexor Pollicis Brevis insertion

lateral side of basse of proximal phalanx of thumb

26

Flexor Pollicis Brevis innervation

Recurrent Branch of median nerve

27

Flexor Pollicis Brevis action

flexes thumb

28

Hypothenar Muscles

-Abductor digiti minimi
-Flexor digiti minimi brevis
-Opponens digiti minimi
-under the pinky finger

29

Abductor digiti minimi origin

pisiform

30

abductor digiti minimi insertion

medial side of base of proximal phalanx of 5th finger

31

abductor digiti minimi innervation

deep branch of ulnar nerve

32

abductor digiti minimi action

abdcuts 5th digit

33

flexor digiti minimi brevis origin

hook of the hamate and flexor retinaculum

34

flexor digiti minimi brevis insertion

medial side of base of proximal phalanx of 5th finger

35

flexor digiti minimi brevis innervation

deep branch of the ulnar nerve

36

flexor digiti minimi brevis action

flexes 5th fingers

37

Opponens digiti minimi origin

hook of the hamate and flexor retinaculum

38

Opponens digiti minimi insertion

medial border of 5th metacarpal

39

Opponens digiti minimi innervation

deep branch of the ulnar nerve

40

Opponens digiti minimi action

draws the 5th digit and rotates it, to help it touch the tip of thumb

41

Muscles of the hand

Lumbricals and Interossei

42

Lumbricals 1,2,3,4 origin

1 and 2: lateral two tendons of flexor digitorum profundus
3 and 4: medial three tendons of flexor digitorum profundus

43

Lumbricals 1,2,3,4 insertion

all 4 the same: laterl sides of the extensor expansions

44

lumbricals 1,2,3,4 innervation

median nerve

45

lumbricals 1,2,3,4 action

-Flex MCP joint
-Extends both IP joints

"L" hands

46

dorsal interossei 1-4 origin

adjacent sides of two metacarpals

47

Dorsal interossei 1-4 insertion

bases of proximal phalages
extensor expansion of 2-5 digits

48

Dorsal interossei 1-4 innervation

Deep branch pf the ulnar nerve

49

Dorsal interossei 1-4 action

-DAB
-Abducts 2nd-4th fingers from the axial line
-acts with the lumbricals to flex MCP joint and extend IP joints

50

Palmar interossei 1-3 origin

Palmar surface of 2nd, 4th and 5th metacarpal

51

Palmar interossei 1-3 insertion

bases of proximal phalanges
extensor expansions of 2nd, 4th, and 5th fingers

52

Palmar interossei 1-3 innervation

deep branch of ulnar nerve

53

Palmar interossei 1-3 action

-PAD
-adducts 2nd, 4th, and 5th, finger towards the axial line
-acts with the lumbricals to flex MCP joint and extend IP joints

54

Ulnar artery

-enters anterior to flexor retinaculum in Guyon's canal
-lateral to the ulnar nerve
-gives rise to the deep palmar branch and the superifical palmar arch (which has three digital arteries)

55

The three digital arteries of the superical palmar arch

-made by the ulnar artery
-common palmar
-palm metacarpal
-proper palmar digital

56

Route of the radial artery

-Curves dorsally around scaphoid and trapzium in the floor of the snuff box
-reaches palm by passing between head of first dorsal interossei
-turns medially and passes between heads of adductor pollicis
-the joins with the ulnar artery to form the deep palmar arch

57

Extensor Mechanism

-Complex network of ligamentous and muscular units that coorinate to product extension of the digits
-Interossei (Dorsal and Palmar)
-Lumbricals
-Oblique Retinacular ligament (ORL)
-Extensor digitorum

58

Extensor expansion what is it?

triangular tendinosis aponerosis wrapping around dorsum and sides of the metacarpal heads and base of proximal phalanx

59

Extensor digitorum hood

-splits into median bands and lateral bands
-anchored on the side by palmar ligamen

60

Oblique retinacular ligament

-taut during flexion of DIP and this puls the PIP into flexion
-extending the PIP joint pulls the DIP into exension

(When you pull of the DIP with the ORL it makes the PIP follow)

61

Mallet FInger

a finger stuck in a PIP joint that is flexed

62

Dupuytren Contracture

-common in men of eastern european descent who smoke
-fascia of the hand hardens and pulls of the fourth and fifth digit into extension

63

Tigger finger

Nodule of the long flexor tendon