Forearm and Hand Origins/ Insertions

Question 1

Flexor Pollicis Longus

Answer 1

Origin: Anterior surface of the radius, medial epicondyle of the humerus, and the coronoid process of the ulna

Insertion: The anterior aspect of the base of the distal phalanx of the thumb

Question 2

Flexor Carpi Radialis

Answer 2

Origin: Medial epicondyle of the humerus via the common flexor tendon

Insertion: Anterior side of the bases of the 2nd and 3rd metacarpal

Question 3

Flexor Digitorum Superficialis

Answer 3

Origin:
Humeral head: Medial epicondyle of the humerus via the common flexor tendon and the coronoid process of the ulna
Radial head: proximal ½ of the anterior shaft of the radius (just distal to the radial tuberosity)

Insertion: Anterior surfaces of fingers 2-5; each of the four tendons divides into slips that attach onto the sides of the anterior surface of the middle phalanx

Question 4

Flexor Carpi Ulnaris

Answer 4

Origin: Medial epicondyle of the humerus via the common flexor tendon and the medial margin of the olecranon and the posterior proximal ⅔ of the ulna

Insertion: The pisiform, the cook of the hamate, and the base of the 5th metacarpal

Question 5

Palmaris Longus

Answer 5

Origin: Medial epicondyle of the humerus via the common flexor tendon

Insertion: The palmar aponeurosis and the flexor retinaculum

Question 6

Dorsal Interossei Manus

Answer 6

Insertion: dorsal expansion

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Question 7

Palmar Interossei

Answer 7

Insertion: dorsal expansion

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Question 8

Pronator Teres

Answer 8

Origin:
Humeral head: Medial epicondyle of the humerus via the common flexor tendon and the medial supracondylar ridge of the humerus
Ulnar head: Medial surface of the coronoid process of the ulna

Insertion: The middle ⅓ of the lateral radius

Question 9

Flexor Digitorum Profundus

Answer 9

Origin: Medial and anterior ulna; the proximal ½ (just distal to the ulnar tuberosity) and the interosseous membrane

Insertion: The anterior surfaces of the distal phalanges of fingers 2-5

Question 10

Pronator Quadratus

Answer 10

Origin: The distal ¼ of the anterior ulna

Insertion: The distal ¼ of the distal radius

Question 11

Supinator

Answer 11

Origin: The lateral epicondyle of the humerus and the supinator crest of the proximal ulna

Insertion: The proximal ⅓ of the posterior, lateral, and anterior sides of the proximal radius

Question 12

Brachioradialis

Answer 12

Origin: The proximal ⅔ of the lateral supracondlylar ridge of the humerus

Insertion: The lateral side of the styloid process of the radius

Question 13

Anconeus

Answer 13

Origin: The lateral epicondyle of the humerus

Insertion: The lateral side of the olecranon process of the ulna and the proximal ¼ of the posterior ulna

Question 14

Brachialis

Answer 14

Origin: Distal ½ of the anterior shaft of the humerus

Insertion: The ulnar tuberosity and the coronoid process of the ulna

Question 15

Extensor Digitorum

Answer 15

Origin: Lateral Epicondyle of the humerus via the common extensor tendon

Insertion: Phalanges of fingers 2-5 via its dorsal digital expansion onto the posterior surfaces of the middle and distal phalanges

Question 16

Extensor Digiti Minimi

Answer 16

Origin: Lateral epicondyle of the humerus via the common extensor tendon

Insertion: Extensor expansion on the little finger

Question 17

Extensor Indicis

Answer 17

Origin: The distal ⅓ of the posterior ulna and the interosseous membrane

Insertion: Extensor expansion of finger 2

Question 18

Extensor Pollicis Brevis

Answer 18

Origin: the distal ⅓ of the posterior radius and the adjacent interosseous membrane

Insertion: the posterolateral base of the proximal phalanx of the thumb

Question 19

Extensor Pollicis Longus

Answer 19

Origin: The middle ⅓ of the posterior ulna and the adjacent interosseous membrane

Insertion: The thumb via its dorsal digital expansion onto the posterior surface of the distal phalanx of the thumb

Question 20

Abductor Pollicis Longus

Answer 20

Origin: Approximately the middle ⅓ of the posterior radius, ulna and interosseous membrane

Insertion: the lateral side of the base of the 1st metacarpal

Question 21

Extensor Carpi Radialis Brevis

Answer 21

Origin: Lateral Epicondyle of the humerus via the common extensor tendon

Insertion: The posterior side of the base of the 3rd metacarpal

Question 22

Extensor Carpi Radialis Longus

Answer 22

Origin: The distal ⅓ of the lateral supracondylar ridge of the humerus

Insertion: The posterior side of the base of the 2nd metacarpal

Question 23

Extensor Carpi Ulnaris

Answer 23

Origin: Lateral condyle of the humerus via the common extensor tendon and the posterior middle ⅓ of the ulna

Insertion: The posterior side of the base of the 5th metacarpal