Hand Complex

Question 1

CMC joints

Answer 1

carpometacarpal joints
-attach carpals to metacarpals

Question 2

what are the most stable metacarpals

Answer 2

2nd + 3rd

Question 3

CMC joints have increasing mobility to what

Answer 3

ulnar border

Question 4

palmar + carpal arches

Answer 4

structure of carpals + how they articulate with metacarpals helps account for some of the arches of the hand

Question 5

what causes arches of the hand

Answer 5

the shape of the carpals + metacarpals

Question 6

palmar arches

Answer 6

go across palm

Question 7

longitudinal arch

Answer 7

goes across hand (bottom of hand up to ends of fingers)

Question 8

carpal tunnel

Answer 8

through the carpal tunnel travels neurovascular structures, so we end up getting compression of neurovascular structures if there is a space occupying lesion within this space

Question 9

MCP joints

Answer 9

metacarpophalangeal joints
-between metacarpals + phalanges

Question 10

what is most congruent in MCP joints

Answer 10

frontal plane articular surfaces
-however still lots of mobility in the frontal plane

Question 11

close-packed position of MCP joints

Answer 11

full flexion
-not as much mobility in sagittal plane

Question 12

MCP joints mobility in different planes

Answer 12

-lots of mobility in frontal plane
-not much mobility in sagittal plane; close-packed in full flexion

Question 13

if I flex MCP, amount of frontal movement becomes very small, particualrly in 2nd + 3rd, particularly due to ____

Answer 13

volar plate

Question 14

volar plate

Answer 14

extension of phalanx that comes over front of MCP
-located on palm side of finger
-attached to the base of the proximal phalanx

Question 15

what does volar plate do

Answer 15

limits how far MCP can extend
-also limits how far it can flex

Question 16

IP joint

Answer 16

interphalangeal joint
-between phalanges

Question 17

how many DOF of IP joints

Answer 17

1 DOF

Question 18

IP joint structure is similar to which joint structure

Answer 18

MCP joint

Question 19

in IP joints, flexion increases in which direction

Answer 19

ulnarly
-IP flexion increases as we move toward ulnar border
-particularly because a lot of ulnar movement is responsible for GRIP

Question 20

what movement is responsible for grip

Answer 20

ulnar movement

Question 21

where is the trapezium found

Answer 21

at the base of the 1st metacarpal

Question 22

what type of joint is between thumb (1st metacarpal) + trapezium

Answer 22

saddle joint

Question 23

KNOW-
thumb opposition is a combination of what 2 movements

Answer 23

abduction + flexion

Question 24

describe how joint between thumb + trapezium is a saddle joint

Answer 24

because it is convex in one plane + concave in another plane
-allows thumb metacarpal to get a lot of motion relative to the carpal

Question 25

describe MCP joint of thumb

Answer 25

more limited than the MCP joints of the fingers

Question 26

describe IP joint of the thumb

Answer 26

similar to IP joints of the fingers