Quiz 2.3

Question 1

FOOSH

Answer 1

Falling on an outstretched hand
Common injury in sports and older adults
Range from bruising to severe (fracture/dislocation)

Question 2

Joints of the wrist

Answer 2

Radiocarpal
Midcarpal

Question 3

Radiocarpal

Answer 3

80% of compressive force is transmitted to radius

Question 4

Midcarpal

Answer 4

Medial and lateral compartments
Less movement

Question 5

Joints of the hand/fingers

Answer 5

Distal interphalangeal joint (DIP)
Proximal interphalangeal joint (PIP)
Metacarpophalangeal joint (MCP)
Know where these are

Question 6

Joints of the thumb

Answer 6

Interphalangeal joint (IP)
Metacarpophalangeal I joint (MCP I)
Carpometacarpal joint (CMC)
Know where these are

Question 7

Extrinsic ligaments of the wrist

Answer 7

Radial collateral
Palmar Radiocarpal
Palmar ulnocarpal
Dorsal Radiocarpal
Dorsal ulnocarpal
Ulnar collateral

Question 8

Short intrinsic wrist ligament function

Answer 8

Stabilize the distal row of carpals

Question 9

Long intrinsic wrist ligament function

Answer 9

Provide transverse stability

Question 10

Carpal tunnel

Answer 10

Formed by the transverse carpal ligament
Passageway underneath for BV and nerves

Question 11

Carpal Tunnel Syndrome

Answer 11

Pinching of the median nerve under transverse carpal ligament due to weird positioning of hands
Wrist brace or surgery if severe

Question 12

Primary movement of wrist

Answer 12

Flex/extend

Question 13

Central column

Answer 13

Radius –> lunate –> capitate –> 3rd metacarpal

Question 14

Anchor of wrist flex/ext

Answer 14

Capitate –> 3rd metacarpal

Question 15

Movements of the wrist and hand

Answer 15

Flex/ext
Radial/ulnar deviation
Flex/ext fingers

Question 16

Difference between extensor and flexor muscle origin in forearm

Answer 16

Extensors primarily come from lateral epicondyle and flexors primarily from medial epicondyle

Question 17

What is common about flexors? Extensors?

Answer 17

Flexors have same origin
Extensors have same origin
(more or less)

Question 18

Extensor retinaculum

Answer 18

Sheath that provides support and stability for all the extensor muscles and their long tendons
Similar purpose as the transverse carpal lig but on dorsal side

Question 19

Flexor retinaculum

Answer 19

Continuous with extensor, long tendons reside underneath and the transverse carpal

Question 20

How do muscles flex and extend both the wrist and fingers?

Answer 20

It depends on where the anchor (insertion) point is and the pulley system of the hand.
*Finger flex/ext all on palmar side

Question 21

Point of intrinsic hand muscles

Answer 21

Allow for more movement of hand beyond flex/ext
*see slide list of muscles/movements

Question 22

Difference between precision grip and thumb opposition

Answer 22

Gross vs. fine motor control
Precision uses more intrinsic muscles

Question 23

What makes human hands/thumb unique to non-human primates?

Answer 23

Ability to use thumb and have fine motor control
Greater variety of movement at thumb

Question 24

What influences grip strength

Answer 24

Angle of wrist
Flexed wrist = least grip strength because extensors must counteract flexion torque of finger flexors
Extended wrist = max grip
Extensor muscles are neutralizers for finger flexion (grip strength)

Question 25

Radial vs. ulnar deviators

Answer 25

Radial deviators produce more torque than ulnar

Question 26

Deviation

Answer 26

Frontal plane movement
Extensor/flexor synergy (work together to perform action)

Question 27

Movement analysis

Answer 27

Know how to do
Break into phases
See slides