KIN 245 Chapter 7: The Wrist and Hand Joints

Distal row from the radial to ulnar side

-trapezium:great multangular -trapezoid: lesser multangular -capitate: head shaped -hamate: hooked

following muscle does not perform wrist extension

abductor pollicis longus

movement of the back of the hand/or the phalanges toward the posterior or dorsal aspect of the forearm is termed

extension

which muscle may be palpated jut proximal to the dorsal aspect of the wrist

extensor carpi radialis longus

the _____ has the following attachment: origin: lateral epicondyle of the humerus, insertion: four tendons of the middle and distal phalanxes of the four fingers on the dorsal surface

extensor digitorum

the ____ has the following attachments: origin:medial epicondyle of the humerus, insertion:base of the second and third metacarpals on the palmar surface

flexor carpi radialis

what muscle performs adduction of the wrist

flexor carpi ulnaris

the _____ has the following attachments- origin: proximal three-fourths of the anterior and medial ulna, insertion:base of the distal phalanges of the four figners

flexor digitorum profundus

Origin of the flexor pollicis longus

middle anterior surface of the radius

Extension

movement of back of hand and or phalanges toward posterior or dorsal aspect of forearm.

Flexion

movement of palm of hand/or phalanges toward anterior or solar aspect of forearm

Opposition

movement of thumb across palmar aspect to oppose any or all of the phalanges

Reposition

movement of thumb as it returns to anatomical position from opposition with hand and or fingers

movement of the thumb across the palmar aspect to oppose any or all of the phalanges is termed

opposition

T/F: motions of the wrist joint include flexion, extension, abduction and adduction

true

T/F: only muscle involved in extending all of the metacarpophalangeal and interphalangeal joints of the four fingers is the extensor digitorum

true

T/F: ulnar flexion is movement of little finger side of hand toward medial aspect or ulnar side of the forearm

true

T/F:interphalangeal joints may be actively flexed to a greater degree with the wrist in slight extension as opposed to full flexion

true

Abductor Pollicis Longus muscle

-abduction of thumb at carpometacarpal joint -abduction wrist -extension of thumb at carpometacarpal joint -weak supination od forearm from a pronated position -weak flexion of wrist

key distal bony landmarks for muscles involved in wrist motion

-base of 2nd, 3rd, and 5th metacarpals, pisiform and hamate

key bony landmarks for finger muscle

-base of proximal, middle and distal phalanxes -base of 1st metacarpal, proximal and distal phalanxes of thumb

Extensor Digitorum muscle

-extension of 2nd, 3rd, 4th and 5th phalanges at metacarpophalangeal joints -extension of wrist -weak extension of elbow

Extensor Indicis muscle

-extension of index finger at metacarpophalangeal joint -weak wrist extension -weak supination of forearm a pronated position

movement of the fingers away from the middle finger is termed

abduction

movements of the extensor policies braves include extension of the thumb at the carp metacarpal and metacapophalangeal joints and wrist _____

abduction

Extensor digiti minimi muscle

-extension of little fingers at metacarpophalangeal joint -weak wrist extension -weak elbow extension

Extensor Pollicis Brevis muscle

-extension of thumb at carpometacarpal and metacarpophalangeal joints -weak wrist extension -wrist abduction

Extensor Pollicis Longus muscle

-extension of thumb at carpometacarpal, metacarpophalangeal and interphalangeal joint -extension of wrist -abduction of wrist -weak supination of forearm from a pronated position

Extensor Carpi Radialis Brevis

-extension of wrist -abduction of wrist -weak flexion of elbow

Extensor Carpi Radialis Longus muscle

-extension of wrist -abduction of wrist -weak flexion of elbow -weak pronation to neutral from a fully supinated position

Extensor Carpi Ulnaris Muscle

-extension of wrist -adduction of wrist together with flexor carpi ulnaris muscle

Fingers

-flex -extend -MCP joints also abduct and adduct

Wrist

-flexion -extension -abduction -adduction

Flexor Digitorum Profundus muscle

-flexion of 4 fingers at metacarpophalangeal proximal interphalangeal and distal interphalangeal joints -flexion of wrist

Flexor Digitorum Superficialis muscle

-flexion of fingers at metacarpophalangeal and proximal interphalangeal joints -flexion of wrist -weak flexion of elbow

Flexor Pollicis Longus muscle

-flexion of thumb carpometacarpal, metacarpophalangeal and interphalangeal joints -flexion of wrist -abduction of wrist

Flexor Capri Ulnaris muscle

-flexion of wrist -adduction of wrist together with extensor carpi ulnaris muscle -weak flexion of elbow

Palmaris Longus muscle

-flexion of wrist -weak flexion of elbow

Flexor Carpi Radialis muscle

-flexion of wrist -abduction of wrist -weak flexion of elbow -weak pronation of forearm

adduction: ulnar flexion

-movement of little finger side of hand toward medial aspect of ulnar side of forearm -movement of fingers toward middle finger

abduction: radial flexion

-movement of thumb side of hand toward lateral aspect or radial side of forearm -movement of fingers away from middle finger

Proximal row from the radial to ulnar side

-scaphoid: boat shaped, navicular -lunate: moon shaped -triquetrum: three cornered -pisiform: pea shaped

which muscle performs extension of the index finger

extensor indicis

the ____ has the following attachment: origin:posterior surface of the lower middle radius, insertion:base of the proximal phalanx of the thumb on the dorsal surface

extensor pollicis brevis

T/F: flexor digitorum superficialis performs its action int eh frontal plane

false