Deck 10: Structure and Function of the Wrist and Hand Complex

Question 1

What is the MAJOR function of the finger flexor pulley system?

A)Provides nutrition to the tendons
B)Allows tendons to extend digits
C)Provides lubrication to the tendons
D)Allows tendons to conform to curve of digits

Answer 1

Allows tendons to conform to curve of digits

Question 2

Which of the following bones forms a saddle joint with the base of the first metacarpal?

A)Hamate
B)Trapezoid
C)Capitate
D)Trapezium

Answer 2

Trapezium

Question 3

Which of the following directions is MOST CORRECT to palpate the capitate bone?

A)Palpate proximal to base of third metacarpal bone
B)Palpate proximal to base of fourth metacarpal bone
C)Palpate proximal to base of second metacarpal bone
D)Palpate proximal to base of fifth metacarpal bone

Answer 3

Palpate proximal to base of third metacarpal bone

Question 4

How many degrees of freedom is present at the thumb carpometacarpal joint?

A)1 degree
B)2 degrees
C)3 degrees
D)4 degrees

Question 5

Which of the following structures pass through the carpal tunnel?

A)Finger flexor tendons, radial nerve
B)Finger extensor tendons, ulnar nerve
C)Finger flexor tendons, median nerve
D)Finger flexor and extensor tendons, musculocutaneous nerve

Question 6

What is the function of the wrist flexor and extensor retinaculum?

A)Increases strength of finger flexor and extensor muscles
B)Protects the carpals against fractures
C)Counters ulnar and radial deviation stresses
D)Prevents bowstringing of finger flexor and extensor tendons

Question 7

What is the influence of the medial tilt of the radial styloid process on movement of the wrist?

A)Movement through a larger range of radial deviation compared with ulnar deviation
B)Movement through a larger range of wrist flexion compared with extension
C)Movement through a larger range of ulnar deviation compared with radial deviation
D)Movement through a larger range of wrist extension compared with flexion

Question 8

Which of the following carpals are located in the floor of the anatomical snuff box?

A)Lunate, hamate
B)Scaphoid, trapezium
C)Hamate, trapezoid
D)Capitate, scaphoid

Question 9

Which of the following structures comprise the radiocarpal joint?

A)Distal radius, disc, ulna, trapezium
B)Distal radius, disc, scaphoid, lunate
C)Distal radius, disc, trapezium,
D)Distal radius, disc, lunate, capitate

Question 10

A person has 85° of passive right wrist flexion, 45° of extension, and 21° of ulnar and radial deviation.Which directions of motion are limited for this person compared with the average norms?

A)Extension, radial deviation
B)Flexion, radial deviation
C)Extension, ulnar deviation
D)Flexion, ulnar deviation

Question 11

Which of the following statements is MOST CORRECT about the longitudinal arch of the hand?

A)Rigid arch, capitate is the keystone of the arch
B)Passes through all metacarpal heads, third metacarpal is the keystone
C)Second and third metacarpals are central pillars, and thumb and fourth and fifth digits move around them
D)Supported by the wrist and extrinsic hand muscles

Question 12

Which of the following muscle groups have a common proximal attachment on the lateral humeral epicondyle and supracondylar ridge?

A)Finger flexors
B)Wrist flexors
C)Finger extensors
D)Wrist extensors

Question 13

Which of the following statements BEST describes hand mobility that allows greater closure of the hand?

A)Available joint range of motion increases in first three digits then decreases for fourth and fifth digits
B)Available joint range of motion increases from radial to ulnar aspects of the hand
C)Available joint range of motion remains the same from radial to ulnar aspects of the hand
D)Available joint range of motion increases from ulnar to radial aspects of the hand

Question 14

Which of the following statements BEST describes thumb abduction?

A)Occurs in a plane at a right angle to the palm
B)Occurs as the metacarpal rotates on the trapezium
C)Occurs in a plane parallel to the palm
D)Occurs as the thumb returns from an opposed position

Question 15

What wrist motion occurs as the wrist moves toward the palmar surface of the hand in a sagittal plane around a frontal axis?

A)Flexion
B)Ulnar deviation
C)Extension
D)Radial deviation

Question 16

What wrist motion occurs as the wrist moves toward the thumb side in the frontal plane around a sagittal axis?

A)Flexion
B)Ulnar deviation
C)Extension
D)Radial deviation

Question 17

What motion is produced when extensor carpi ulnaris and flexor carpi ulnaris are activated together?

A)Ulnar deviation
B)Wrist flexion
C)Radial deviation
D)Wrist extension

Question 18

Which of the following muscles stabilize the wrist during a powerful grip by the hand?

A)Flexor carpi radialis, flexor carpi ulnaris
B)Extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris
C)Flexor digitorum profundus, flexor pollicis longus
D)Extensor digitorum, extensor carpi radialis longus

Question 19

Which of the carpometacarpal joints is the most stable functioning as the central pillar of the hand?

A)Second
B)Third
C)Fourth
D)Fifth

Question 20

A person with a C6 spinal cord injury uses a tenodesis action at the wrist and hand to pick up objects.Which of the following statements BEST describes hand muscle function to grasp the object during this action?

A)Isometric contraction of finger flexors with concentric contraction of wrist extensors
B)Isometric contraction of finger flexors and wrist extensors
C)Concentric contraction of wrist extensors with passive stretching of finger flexors
D)Eccentric contraction of wrist extensors with passive stretching of finger flexors

Question 21

Weakness in which of the following muscles can result in a clawing posture of the hand?

A)Extensor digitorum
B)Interossei, lumbricals
C)Flexor pollicis longus
D)Opponens pollicis, palmaris brevis

Question 22

Which of the following grips is MOST LIKELY to be used to carry an object over a sustained period of time?

A)Hook
B)Precision
C)Power
D)Pulp-to-pulp

Question 23

Which of the following degrees represents the functional position of the wrist and hand?

A)20° wrist extension, 10° ulnar deviation, 45° metacarpophalangeal (MCP) flexion, 30° proximal interphalangeal (PIP) flexion, slight distal interphalangeal (DIP) flexion
B)Neutral wrist extension, 10° ulnar deviation, 45° MCP flexion, 30° PIP flexion, slight DIP flexion
C)20° wrist extension, 10° radial deviation, 30° MCP flexion, 20° PIP flexion, slight DIP flexion
D)45° wrist extension, 10° radial deviation, 30° MCP flexion, 20° PIP flexion, slight DIP flexion

Question 24

What action occurs with the extensor hood when the extensor digitorum muscle contracts?

A)Hood moves proximally over metacarpophalangeal (MCP) joint, extends proximal phalanx
B)Hood moves distally over interphalangeal (IP) joint, extends distal phalanx
C)Hood moves proximally over MCP joint, extends distal phalanx
D)Hood isometrically contracts, extends proximal interphalangeal, IP, and distal phalanx

Question 25

What is the function of the wrist muscles during a cylindrical power grip of the hand?

A)Stabilize wrist in slight extension and ulnar deviation
B)Stabilize wrist in neutral and ulnar deviation
C)Stabilize wrist in slight extension and radial deviation
D)Stabilize wrist in neutral and radial deviation

Question 26

As shown in the image, what hand muscles are activated to flex the second through fifth metacarpophalangeal joints and extend the corresponding interphalangeal joints?

A)Interossei
B)Adductor pollicis
C)Lumbricals
D)Flexor pollicis longus