Upper limb 4

Question 1

Superficial Posterior Muscles of the Forearm

Answer 1

Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum 
Extensor carpi ulnaris
Brachioradialis

Question 2

Deep Posterior Muscles of the Forearm

Answer 2

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

Question 3

Extensor digiti minimi

Answer 3

belly of extensor digitorum

Question 4

Extensor Carpi Radialis Longus

Answer 4

O: Lateral supracondyle ridge of humerus
I: base of 2nd metacarpal
A: Extend + Abduct hand
I: Radial nerve

Question 5

Extensor Carpi Radials Brevis

Answer 5

O: Lateral epicondyle of humerus
I: base of 3rd metacarpal
A: Extend + Abduct hand
I: radial nerve (C7,C8)

Question 6

Extensor Digitorum

Answer 6

O: Lateral epicondyle of humerus
I: Extensor expansions of digits
A: Extend wrist and fingers (at metacarpophalangeal joint)
I:Radial nerve(C7,C8)

Question 7

Extensor Carpi Ulnaris

Answer 7

O: Lateral epicondyle of humerus + ulna
I: base of 5th metacarpal
A: Extend + Abduct hand
I: Radial nerve

Question 8

Brachioradialis

Answer 8

O: lateral supracondylar ridge of humerus
I: lateral surface of radius
A: Flexes forearm
I: Radial nerve

Question 9

Muscles that receive input directly from radial nerve

Answer 9

Brachioradialis
Tricep brachii
Extensor Carpi Radialis Longus
Anconeus

Question 10

Extension Expansions

Answer 10

Aponeurosis formed from the tendons of extensory digitorum

Question 11

Extensor Retinaculum

Answer 11

Similar to Flexor Retinaculum

Question 12

Supinator

Answer 12

O: Lateral epicondyle of humerus + supinator fossa + crest of ulna
I: Lateral/ posterior/ anterior surface of radius
A: Supinate forearm
I: Radial nerve

Question 13

Abductor Pollicis Longus

Answer 13

O: Ulna, Radius, Interosseous membrane
I: Base of 1st metacarpal
A: Abduct + Extend thumb
I: Radial Nerve (posterior interosseous nerve)

Question 14

Extensor Indicis

Answer 14

O: posterior surface of ulna
I: Extensor expansion of 2nd digit
A: Extend index finger + help extend hand
I: Radial Nerve (posterior interosseous nerve)

Question 15

Extensor Pollicis Longus

Answer 15

O: Posterior surface of ulna
I: distal phalanx of thumb
A: Extend distal phalanx of thumb
I: Posterior interosseous nerve

Question 16

Extensor Pollicis Brevis

Answer 16

O: posterior surface of radius
I: Base of Proximal phalanx of thumb
A: Extend proximal phalanx of thumb
I: Posterior interosseous nerve.

Question 17

Anatomical Snuffbox

Answer 17

Formed by tendons of Extensor Pollicis Longus and Brevis

Question 18

Extrinsic muscles of the hand

Answer 18

Flexor Pollicis Longus
Abductor pollicis Longus
Extensor Pollicis Longus
Extensor Pollicis Brevis

Question 19

Intrinsic muscles of the hand (Thenar)

Answer 19

Flexor Pollicis Brevis
Abductor Pollicis Brevis
Opponens Pollicis
Adductor Pollicis

Question 20

Groups of Intrinsic Muscles

Answer 20

Thenar (4)
Hypothenar (3)
Palmar interosseous
- 4 lumbricals
- 3 palmar
- 4 dorsal

Question 21

Abductor Pollicis Brevis

Answer 21

O: Flexor Retinaculum
I: Lateral side of proximal phalanx of thumb
A: Abduct thumb + help oppose
I: Median Nerve

Question 22

Flexor Pollicis Brevis

Answer 22

O: Flexor Retinaculum
I: Lateral side of proximal phalanx of thumb
A: Flexes Thumb
I: Median Nerve

Question 23

Opponens Pollicis

Answer 23

O: Flexor Retinaculum
I: Lateral side of 1st metacarpal
A: Opposition
I: Median Nerve

Question 24

Adductor Pollicis

Answer 24

O: Oblique head: base of 2nd and 3rd metacarpals
Transverse head: anterior surface of 3rd metacarpal
I: medial side of proximal phalanx of thumb
A: Adduction
I; Ulnar Nerve

Question 25

Hypothenar muscles

Answer 25

Abductor digiti minimi Opponens digiti minimi Flexor digiti minimi Palmaris digiti minimi

Question 26

Abductor digiti minimi

Answer 26

O: pisiform I: Proximal phalanx of pinky A: Abduct pinky I: Ulnar nerve

Question 27

Opponens digiti minimi

Answer 27

O: hook of hamate + flexor retinaculum I: 5th metacarpal A: Opposition I: Ulnar nerve

Question 28

Flexor digiti minimi brevis

Answer 28

O: hook of hamate + flexor retinaculum I: Proximal phalanx of pinky A: flexes proximal phlanx of pinky I: ulnar nerve

Question 29

Palmar muscles major groups

Answer 29

lumbricals | interosseous

Question 30

Palmar interossei

Answer 30

``` 3 muscles Superficial Adducts fingers none attached to middle finger Uni-pennate ```

Question 31

Dorsal interossei

Answer 31

``` 4 msucles Deep Abduct fingers 2 attached to middle fingers Bi-pennate ```

Question 32

Lumbricals

Answer 32

Worm-like muscles allow flexion at metacarpophalangeal joints while maintaining extension at interphalangeal joints Don't directly attache to bone Attach to tendons of flexor digitorum profundus and extensor expansions

Question 33

Innervation of intrinsic muscles

Answer 33

``` Median nerve - 2 lateral lumbricals - 3 most lateral thenars Ulnar nerve - 2 medial lumbricals - all other intrinsic muscles ```