Anatomy List: Wrist and Elbow

Question 1

Flexor Carpi Radius

Answer 1

Origin: medial epicondyle of humerus
Insertion: bases of metacarpal bones 2-3
Action: wrist flexion, wrist abduction

Question 2

Flexor Pollicis Longus

Answer 2

Origin: anterior surface of radius and interosseous membrane
Insertion: palmar surface of distal phalanx of thumb
Action: metacarpophalangeal & interphalangeal joint 1; thumb flexion

Question 3

Flexor Digitorum Profundus

Answer 3

Origin: proximal half of anterior surface of ulna, interosseous membrane
Insertion: palmar surfaces of distal phalanges of digits 2-5
Action: metacarpophalangeal & interphalangeal joints 2-5; finger flexion

Question 4

Flexor Digitorum Superficialis

Answer 4

Origin: humeroular head (medial epicondyle of humerus, coronoid process of ulna, radial head (proximal half of anterior border of radius)
Insertion: sides of middle phalanges 2-5
Action: metacarpophalangeal & proximal interphalangeal joints 2-5; finger flexion

Question 5

Extensor Digit Minimi

Answer 5

Origin: lateral epicondyle of humerus
Insertion: extensor expansion of digit 5
Action: metacrapophalangeal 5: finger extention

Question 6

Extensor Digitorum

Answer 6

Origin lateral epicondyle of humerus
Insertion: extensor expansion of digit 5
Action: metacarpophalangeal 5: finger extension

Question 7

Extensor Carpi ulnaris

Answer 7

Origin: lateral epicondyle of humerus, posterior border of ulna
Insertion: base of metacarpal bone 5
Action: wrist joint; hand extension and abduction (radial deviation)

Question 8

Extensor Carpi Radialis Brevis

Answer 8

Origin: lateral epicondyle of the humerus (common extensor tendon)
Insertion: posterior aspect of the base of metacarpal bone 3
Action: wrist joint: hand extension & adduction

Question 9

Extensor Indicis

Answer 9

Origin: posterior surface of the distal third of ulna & interosseous membrane
Insertion: extensor expansion of index finger
Action: wrist joint: weak hand extension, metacarpophalangeal & interphalangeal joints of index finger; finger extension

Question 10

Extensor Carpi Radialis Longus

Answer 10

Origin: lateral supracondylar ridge of humerus, lateral inter-muscular septum of arm
Insertion: posterior aspect of the base of metacarpal bone 2
Action: wrist joint: hand extension, hand abduction

Question 11

Extensor Pollicis Longus

Answer 11

Origin: posterior surface of middle third of ulna & interosseous membrane
Insertion: posterior aspect of base of distal phalanx of thumb
Action: wrist joint: weak hand extension, metacarpophalangeal & interphalangeal joint of thumb; thumb extension

Question 12

Brachialis

Answer 12

Origin: distal half of anterior surface of humerus
Insertion: coronoid process of ulna; tuberosity of ulna
Action: musculocutaneous nerve (C5, C6; Radia (C7)

Question 13

Brachioradialis

Answer 13

Origin: lateral supracondylar ridge of humerus, lateral intermuscular septum of arm
Insertion: (proximal to) styloid process of radius
Action: elbow joint, forearm flexion (when semi pronated)

Question 14

Biceps Brachii

Answer 14

Origin: Short head: apex of the Coracoid process of the scapula
Long head: Supraglenoid tubercle of the scapula
Insertion: Radial tuberosity of the radius.Deep fascia of forearm (insertion of the bicipital aponeurosis
Action:

Question 15

Triceps Brachii

Answer 15

Origin: Long head: infraglenoid tubercle of the scapula
Medial head: posterior surface of the humerus (inferior to the radial groove)
Lateral head: posterior surface of the humerus (superior to the radial groove
Insertion: Olecranon of ulna and fascia of forearm
Action: Elbow joint: extension of the forearm. Shoulder joint: extension and adduction of the arm (long head)

Question 16

Palmaris Longus

Answer 16

Origin: medial epicondyle of humerus
Insertion: flexor retinaculum, palmar aponeurosis
Action: wrist flexion; tenses palmar aponeurosis

Question 17

Anconeus

Answer 17

Origin: lateral epicondyle of humerus
Insertion: lateral surface of olecranon
Action forearm extension of the elbow joint

Question 18

Supinator

Answer 18

Origin: lateral epicondyle of humerus
Insertion: lateral, posterior, and anterior surface of proximal third of radius
Action: forearm supination

Question 19

Pronator Quadratus

Answer 19

Origin: distal anterior surface of ulna
Insertion: distal anterior surface of radius
Action: forearm pronation

Question 20

Pronator Teres

Answer 20

Origin: Humeral Head: medial supracondylar ridge of humerus, ulnar head: coronoid process of ulna
Insertion: lateral surface of radius
Action: flexion of the forearm at the elbow joint