Muscles Of The Forearm And Hand (Origins And Insertions)

Question 1

Name the superficial muscles of the anterior fascial compartment of the forearm

Answer 1

-Pronator teres
-Flexor carpi radialis
-Palmaris longus
-Flexor carpi ulnaris

Question 2

Name the O and I of the pronator teres

Answer 2

O: Humeral head- medial epicondyle of humerus (above CFO)
Ulnar head- coronoid process of ulna (med surface)

I: Midlateral surface of radial shaft

Question 3

Name the O and I of the flexor carpi radialis

Answer 3

O: Medial epicondyle of humerus via common flexor tendon

I: Base of 2nd and 3rd metacarpal (palmar surface)

Question 4

Name the O and I of the palmaris longus

Answer 4

O: Medial epicondyle of humerus via common flexor tendon

I: Palmar carpal ligament and palmar aponeurosis (flexor retinaculum)

Question 5

Name the O and I of the flexor carpi ulnaris

Answer 5

O: Humeral head- medial epicondyle via common flexor tendon
Ulnar head- olecranon and posterior border of ulna (superior 2/3)

I: Pisiform, hook of hamate and base of 5th metacarpal

Question 6

Name the middle muscle of the anterior fascial compartment of the forearm

Answer 6

-Flexor digitorum superficialis

Question 7

Name the O and I of the flexor digitorum superficialis

Answer 7

O: Humeroulnar head- medial epicondyle of humerus and coronoid process of ulna (medial side)
Radial head- oblique line of radius (anterior surface)

I: Shaft of middle phalanges of digits 2-5

Question 8

Name the deep muscles of the anterior fascial compartment of the forearm

Answer 8

-Flexor digitorum profundus
-Flexor pollicis longus
-Pronator quadratus

Question 9

Name the O and I of the flexor digitorum profundus

Answer 9

O: Proximal 2/3 of anterior surface of ulna and interosseus membrane

I: Bases of distal phalanges of digits 2-5

Question 10

Name the O and I of the flexor pollicis longus

Answer 10

O: Anterior surface of radius (middle 1/2) and interosseus membrane

I: Base of distal phalanx of first digit

Question 11

Name the O and I of the pronator quadratus

Answer 11

O: Distal 1/4 of anterior surface of ulna

I: Distal 1/4 of anterior surface of radius (slightly distal to origin)

Question 12

Name the superficial muscles of the posterior fascial compartment of the forearm

Answer 12

-Brachioradialis
-Extensor carpi radialis longus
-Extensor carpi radialis brevis
-Extensor digitorum
-Extensor digiti minimi
-Extensor carpi ulnaris

Question 13

Name the O and I of the brachioradialis

Answer 13

O: Lateral supracondylar ridge of humerus (and lateral intermuscular septum)

I: Base of styloid process of radius

Question 14

Name the O and I of the extensor carpi radialis longus

Answer 14

O: Distal 1/3 of lateral supracondylar ridge of humerus

I: Base of 2nd metacarpal (dorsal surface)

Question 15

Name the O and I of the extensor carpi radialis brevis

Answer 15

O: Lateral epicondyle of humerus via common extensor tendon

I: Base of 3rd metacarpal (dorsal and radial surface)

Question 16

Name the O and I of the extensor digitorum

Answer 16

O: Lateral epicondyle of humerus via common extensor tendon

I: Middle and distal phalanges of digits 2-5

Question 17

Name the O and I of the extensor digiti minimi

Answer 17

O: Lateral epicondyle of humerus via common extensor tendon

I: Tendon of extensor digitorum of 5th digit (extensor expansion or hood)

Question 18

Name the O and I of the extensor carpi ulnaris

Answer 18

O: Lateral epicondyle of humerus via common extensor tendon and posterior border of ulna

I: Base of 5th metacarpal (ulnar surface)

Question 19

Name the deep muscle of the posterior fascial compartment of the forearm

Answer 19

-Supinator
-Abductor pollicis longus
-Extensor pollicis longus
-Extensor pollicis brevis
-Extensor indicis

Question 20

Name the O and I of the abductor pollicis longus

Answer 20

O: Posterior surface of middle radius and ulna and interosseus membrane

I: Base of 1st metacarpal (lateral/radial side)

Question 21

Name the O and I of the supinator

Answer 21

O: Lateral epicondyle of humerus, radial collateral and annular ligaments, and supinator crest of ulna

I: Superior 1/3 of lateral and anterior surface of radius

Question 22

Name the O and I of the extensor pollicis longus

Answer 22

O: Middle 1/3 of posterior surface of ulna and interosseus membrane (distal to AbdPL)

I: Base of distal phalanx of thumb

Question 23

Name the O and I of the extensor pollicis brevis

Answer 23

O: Posterior surface of middle radius and interosseus membrane (distal to AbdPL)

I: Base of proximal phalanx of thumb

Question 24

Name the O and I of the extensor indicis

Answer 24

O: Distal posterior surface of the ulna and interosseus membrane

I: Tendon of extensor digitorum on 2nd digit (extensor expansion or hood)

Question 25

Name the muscles of the thenar group of the intrinsic muscles of the hand

Answer 25

-Abductor pollicis brevis -Opponens pollicis -Flexor pollicis brevis -Adductor pollicis

Question 26

Name the O and I of the abductor pollicis brevis

Answer 26

O: Flexor retinaculum, scaphoid, and tubercle of trapezium I: Base of proximal phalanx of first digit (lateral/radial aspect)

Question 27

Name the O and I of the opponens pollicis

Answer 27

O: Flexor retinaculum and trapezium I: Lateral shaft of first metacarpal (radial side)

Question 28

Name the O and I of the flexor pollicis brevis

Answer 28

O: Flexor retinaculum and trapezium I: Base of proximal phalanx of first digit (lateral/radial aspect)

Question 29

Name the muscles of the hypothenar group of the intrinsic muscle of the hand

Answer 29

-Palmaris brevis -Abductor digiti minimi Hypothenar group continued: -Flexor digiti minimi brevis -Opponens digiti minimi

Question 29

Name the O and I of the adductor pollicis

Answer 29

O: Oblique head- capitate and bases of metacarpals 2 and 3 Transverse head- 3rd metacarpal (anterior surface) I: Medial side of proximal phalanx of thumb

Question 30

Name the O and I of the palmaris brevis

Answer 30

O: Flexor retinaculum and palmar aponeurosis I: Skin on ulnar border of palm of hand

Question 31

Name the O and I of the abductor digiti minimi

Answer 31

O: Pisiform I: Base of proximal phalanx of 5th digit

Question 32

Name the O and I of the flexor digiti minimi brevis

Answer 32

O: Flexor retinaculum and hook of hamate I: Base of proximal phalanx of 5th digit

Question 33

Name the O and I of the opponens digiti minimi

Answer 33

O: Flexor retinaculum and hook of hamate I: Medial border of shaft of 5th metacarpal

Question 34

Name the muscles of the intermediate/central group of the intrinsic muscles of the hand

Answer 34

-Lumbricales -Dorsal interosseii -Palmar interosseii

Question 35

Name the O and I of the lumbricales

Answer 35

O: Tendons of flexor digitorum profundus (off lateral aspect of 2nd-5th tendons and medial aspect of 3rd and 4th tendons) I: Extensor expansion (hoods) of digits 2-5

Question 36

Name the O and I of the dorsal interosseii

Answer 36

O: Adjacent sides of shaft of metacarpals (2 heads) I: Extensor expansions and bases of proximal phalanges of digits 2-4

Question 37

Name the O and I of the palmar interosseii

Answer 37

O: Palmar medial surface of 2nd metacarpal and palmar lateral surface of 4th and 5th metacarpal (1 head) I: Extensor expansions and bases of proximal phalanges of digits 2, 4, and 5