Wrist/Finger Joints

Question 1

Flexor Carpi Radialis

Answer 1

O: common flexor tendon from medial epicondyle of humerus
I: base of second metacarpal
A: flexion and radial deviation of hand
N: median nerve

Question 2

Flexor Carpi Ulnaris

Answer 2

O: common flexor tendon from medial epicondyle of humerus
I: pisiform bone
A: flexion and ulnar deviation of hand
N: ulnar nerve

Question 3

Palmaris Longus

Answer 3

O: common flexor tendon from medial epicondyle of humerus
I: palmer aponeurosis
A: flexion of hand
N: median nerve

Question 4

Extensor Carpi Radialis Longus

Answer 4

O: lateral supracondylar ridge of humerus (common extensor tendon)
I: base of 2nd metacarpal
A: extension and radial deviation of hand
N: radial nerve

Question 5

Extensor Carpi Radialis Brevis

Answer 5

O: lateral epicondyle of humerus (common extensor tendon)
I: base of third metacarpal
A: extension and radial deviation of hand
N: radial nerve

Question 6

Extensor Carpi Ulnaris

Answer 6

O: lateral epicondyle of humerus (common extensor tendon)
I: base of 5th metacarpal
A: extension and ulnar deviation of wrist
N: radial nerve

Question 7

Flexor Digitorum Profundus

Answer 7

O: anterior and medial surfaces of proximal two thirds of ulna; interosseous membrane
I: distal phalanx of 4 fingers
A: flexion of distal phalanx of each of the four fingers (medial four digits); with continued action, flexion of the middle and proximal phalanges; aids in flexion of hand
N: median ulnar nerve

Question 8

Flexor Digitorum Superficialis

Answer 8

O: medial epicondyle of humerus (common flexor tendon); medial aspect of coronoid process of ulna; proximal half of radius distal to radial tuberosity
I: base of middle phalanx of each of four fingers (medial four digits)
A: flexion of middle phalanx of four fingers (medial four digits); with continues action, flexion of each proximal; aids in flexion of hand
N: median nerve

Question 9

Flexor Digiti Minimi Brevis

Answer 9

O: hook of hamate; flexor retinaculum
I: base of proximal phalanx of 5th digit
A: flexion of the 5th digit
N: deep branch of ulnar nerve

Question 10

Palmar Interossei

Answer 10

O: sides of metacarpals 2,4, and 5
I: base of proximal phalanx and extensor expansion of digits 2,4,and 5
A: adducts digits towards axial line of hand (3rd digit); flexes digits at metacarpophalangeal joint and extends interphalangeal joints
N: ulnar nerve (deep branch)

Question 11

Lumbricals

Answer 11

O: 1st and 2nd: lateral two tendons of flexor digitorum profundus. 3rd and 4th: medial three tendons of flexor digitorum profundus
I: 1st and 2nd: lateral sides of extensor expansion of digits 2 and 3. 3rd and 4th: lateral sides of extensor expansion of digits 4 and 5
A: extends digits at interphalangeal joints, flex metacarpophalangeal joints
N: ulnar nerve (deep branch)

Question 12

Extensor Digitorum Communis

Answer 12

O: lateral epicondyle of humerus (common extensor tendon)
I: middle and distal phalanges of each of four fingers (medial four digits)
A: extension of each of four fingers (medial four digits)
N: radial nerve

Question 13

Extensor Indicis

Answer 13

O: posterior surface of ulna; interosseous membrane
I: extensor expansion of index finger
A: extension and adduction of index finger
N: radial nerve

Question 14

Extensor Digiti Minimi

Answer 14

O: lateral epicondyle of humerus (common extensor tendon)
I: middle and distal phalanges of little finger
A: extends the pinkie, 5th digit
N: radial nerve

Question 15

Dorsal Interossei

Answer 15

O: adjacent sides of two metacarpal bones
I: base of proximal phalanges, extensor expansion of digits 2-4
A: abduct digits from axial line of hand (3rd digit); flex digits at metacarpophalangeal joint and extend interphalangeal joints
N: ulnar nerve (deep branch)

Question 16

Abductor Digiti Minimi

Answer 16

O: pisiform bone and tendon of flexor carpi ulnaris
I: medial side of base of proximal phalanx of little finger (5th digit)
A: abducts little finger
N: ulnar nerve (deep branch)