Chapter 5 (Wrist and Hand)

Including the thumb, how many interphalangeal joints are in one anatomically normal hand?

9

The distal row of carpals includes the trapezium, trapezoid, hamate, and ____ bones

Capitate

The wrist is stabilized by ligaments known as the

Collateral Ligaments

which of the following muscles extends the wrist and four fingers

Extensor Digitorum

Which of the following muscles flexes the wrist and four fingers?

Flexor digitorum superficialis

The scaphoid carpal bone is also known as the _______ bone

Navicular

Movement of the wrist into abduction is more properly known as ____

Radial Deviation

T/F : The only flexor muscle of the wrist that does not have its tendon of insertion passing under the flexor (volar) retinaculum is the palmaris longus

True

T/F : The palmaris longus is not considered a prime mover regarding flexion of the wrist

True

The primary function of the extensor indicis is to extend the MP joint of the index finger and also assist with

Wrist Extension

Because of its fundamental movements, the metacarpophalangeal joint is classified as a ______ joint

biaxial

The articulation between the wrist and the forearm occurs between the radius and the

carpals

The structure known as the common extensor tendon includes the extensor carpi radialis brevis, the extensor carpi ulnaris, the extensor digitorum, and the extensor _____ muscles

digiti minimi

The relationship between the ulnar styloid process and the radial styloid process is such that the radial styloid process is most

distal

Which of the following muscles is not considered part of the common extensor tendon originating on the lateral epicondyle of the humerus?

extensor carpi radialis longus

Extension of the thumb is the function of the

extensor pollicis longus

The distal row of carpal bones articulates with the

metacarpals

The lumbricales, located deep within the hand, both extend the interphalangeal joints and flex the _____ joints of the fingers

metacarpophalangeal

In addition to the adductor pollicis and flexor pollicis brevis, which of the following muscles assists the thumb in gripping?

opponens pollicis

A movement unique to the thumb that allows for grasping is known as

opposition

The extensor digiti minimi extends the PIP joint of the little finger, and the two muscles acting as the main antagonists are the flexor digitorum ______ and the flexor digitorum ________

profundus, Superficialis

Bands of tissue forming bridges over the carpal bones of the wrist under which the flexor and extensor tendons from the forearm run to the hand are known as the

retinacula

The structure known as the anatomical snuffbox is formed by the tendons of the extensor pollicis brevis and the _____

Adductor Pollicis Longus

Which of the following muscles is considered an intrinsic muscle of the hand?

Interossei

The radiocarpal joint is the articulation between the radius, the scaphoid, and the _______ bones

Lunate

A muscle found just proximal to the wrist that is involved in the action that "turns down" the forearm and the palm of the hand is the

Pronator Quadratus

Which of the following muscles has as its primary function extension of the index finger?

Extensor indicis

T/F : Beneath the space known as the anatomical snuffbox lies the lunate carpal bone

False

T/F : Extension of the wrist primarily occurs at the radiocarpal joints

False

T/F : The bands of tissue at the wrist that keep the flexor muscles and the extensor muscles from rising up under tension are known as the dorsal and volar aponeuroses

False

T/F : The extensor indicis extends the metacarpophalangeal, proximal interphalangeal, and distal interphalangeal joints of the middle finger.

False

T/F : The tendons passing through the structure known as the carpal tunnel are primarily considered the wrist and hand extensors

False

T/F : The thenar eminence is formed by the intrinsic muscles of the little finger

False

The ____ muscles help flex the MP joints and extend the PIP and DIP joints

Lumbricales

The structure known as the common flexor tendon includes the flexor carpi ulnaris, the flexor digitorum superficialis, the flexor carpi radialis, and the _____ muscles

Palmaris Longus

Which of the following wrist flexors does not pass beneath the flexor retinaculum?

Palmaris Longus

The metacarpals articulate with the

Phalanges

The lubricales originate on the tendons of the flexor digitorum profundus and insert on the tendons of the

Extensor digitorum communis

T/F : Flexion of the wrist occurs primarily at the radiocarpal joints

True

T/F : The lumbricales muscles assist with both flexion of the MP joints and extension of the PIP and DIP joints

True

T/F : The most lateral carpal bone of the proximal carpal row is the scaphoid

True

T/F : The wrist joint is stabilizing on the medial and lateral sides by collateral ligaments from the radius and ulna

True

T/F : Ulnar deviation of the wrist in the frontal plane is also known as adduction of the hand

True

The dorsal interossei muscles perform which of the following metacarpophalangeal joint actions?

abduction

The volar (palmar) interossei muscles perform which of the following metacarpophalangeal joint actions?

adduction

Which of the following muscles is not considered an extrinsic muscle of the thumb?

adductor pollicis

The opponens pollicis muscle flexes and _____ the metacarpophalangeal joint of the thumb

adducts

From the anatomical position, thumb abduction and adduction occur in the sagittal plane, while the thumb flexion and extension take place in the

frontal plane

The hypothenar eminence is formed by muscles that move the _____

little finger

The muscles of the forearm that flex and extend only the wrist (and not the fingers) insert on either the carpal bones or the _____ bones

metacarpal

In addition to being able to flex, extend, abduct, and adduct, the thumb is able to perform an additional movement known as

opposition

The movement of the thumb that allows us to grasp objects is known as _____

opposition