Antebrachial Extensors POINA

Question 1

Extrinsic muscles: superficial layer

Answer 1

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

Question 2

Extrinsic muscles: deep layer

Answer 2

-Extensor indicis
-Supinator

Question 3

Extrinsic muscles: outcropping layer

Answer 3

-Abductor pollicis longus (apple)
-Extensor pollicis brevis (extra peanut butter)
-Extensor pollicis longus

Question 4

Extensor Carpi Radialis Longus/Brevis Purposeful Action

Answer 4

Pickleball, painting a wall, stabilize wrist for strong grasp

Question 5

Extensor Carpi Radialis Longus/Brevis Main Action

Answer 5

-Extend wrist (radiocarpal joint)
-Radial deviation (RC joint)
-ECRL active during fist clenching

Question 6

Extensor Carpi Radialis Longus/Brevis Proximal Attachment

Answer 6

-L: lateral supraepicondylar ridge of humerus
-B: Lateral epicondyle of humerus (common extensor tendon)

Question 7

Extensor Carpi Radialis Longus/Brevis Distal Attachment

Answer 7

-L: dorsal base of 2nd MC
B: dorsal base of 3rd MC

Question 8

Extensor Carpi Radialis Longus/Brevis Innervation

Answer 8

Radial C6-C8

Question 9

Extensor Digitorum Purposeful Action

Answer 9

Typing, swiping up on a smartphone

Question 10

Extensor Digitorum Distal Attachment

Answer 10

Extensor expansions of medial four digits

Question 10

Extensor Digitorum Main Action

Answer 10

Extend long digits (MCP primary, IP secondary)

Question 11

Extensor Digitorum Proximal Attachment

Answer 11

Lateral epicondyle (common extensor tendon)

Question 12

Extensor Digitorum Innervation

Answer 12

Deep branch of radial (C7-C8)

Question 13

Extensor Digiti Minimi Purposeful Action

Answer 13

Drinking hot tea in England with queen

Question 14

Extensor Digiti Minimi Main Action

Answer 14

Extend 5th digit (MCP primary, IP secondary)

Question 15

Extensor Digiti Minimi Proximal Attachment

Answer 15

Lateral epicondyle (common extensor origin)

Question 16

Extensor Digiti Minimi Distal Attachment

Answer 16

Extensor expansion of 5th digit

Question 17

Extensor Digiti Minimi Innervation

Answer 17

Radial nerve (deep branch, C7-C8)

Question 18

Extensor Carpi Ulnaris Purposeful Action

Answer 18

Hammering, playing violin, writing

Question 19

Extensor Carpi Ulnaris Main Action

Answer 19

-Extend wrist (radiocarpal joint)
-Ulnar deviation (radiocarpal joint)
-Active during fist clenching

Question 20

Extensor Carpi Ulnaris Proximal Attachment

Answer 20

Lateral epicondyle (common extensor tendon)

Question 21

Extensor Carpi Ulnaris Distal Attachment

Answer 21

Base of 5th metacarpal

Question 22

Extensor Carpi Ulnaris Innervation

Answer 22

Radial nerve (C7-C8)

Question 23

Extensor Indicis Purposeful Action

Answer 23

Pointing at something

Question 24

Extensor Indicis Main Action

Answer 24

-Extend second digit (MCP joint) -May assist to extend wrist (radiocarpal joint)

Question 25

Extensor Indicis Proximal Attachment

Answer 25

Posterior distal ulna and interosseous membrane

Question 26

Extensor Indicis Distal Attachment

Answer 26

Extensor expansion (2nd digit)

Question 27

Extensor Indicis Innervation

Answer 27

Radial (PIN) C7-C8

Question 28

Abductor Pollicis Longus Purposeful Action

Answer 28

Texting, picking up infant

Question 29

Abductor Pollicis Longus Main Action

Answer 29

-Radial deviation of thumb (CMC joint) -Extend thumb (CMC joint)

Question 30

Abductor Pollicis Longus Proximal Attachment

Answer 30

Posterior proximal ulna, radius, and interosseous membrane

Question 31

Abductor Pollicis Longus Distal Attachment

Answer 31

Base of 1st MC

Question 32

Abductor Pollicis Longus Innervation

Answer 32

Radial nerve (PIN, C7-C8)

Question 33

Extensor Pollicis Brevis and Longus Purposeful Action

Answer 33

Giving thumbs up, flipping coin

Question 34

Extensor Pollicis Brevis and Longus Main Action

Answer 34

-Extend thumb (IP joint, EPL only) -Extend thumb (MCP and CMC joints)

Question 35

Extensor Pollicis Brevis and Longus Proximal Attachment

Answer 35

-Longus: posterior ulna and interosseous membrane -Brevis: posterior radius and interosseous membrane

Question 36

Extensor Pollicis Brevis and Longus Distal Attachment

Answer 36

-Longus: base of distal phalanx of thumb -Brevis: base of proximal phalanx of thumb

Question 37

Extensor Pollicis Brevis and Longus Innervation

Answer 37

Radial (PIN, C7-C8)