Posterior Forearm

Question 1

What are the attachments of the extensor carpi radialis longus muscle? ECRL

Answer 1

from the lateral epicondyle of the humerus to the base of the 2nd metacarpal.

Question 2

What are the attachments of the extensor carpi radialis brevis muscle? ECRB

Answer 2

From the lateral supracondylar ridge of the humerus to the base of the 3rd metacarpal

Question 3

What are the attachments of the extensor carpi ulnaris muscle? ECU

Answer 3

From the later epicondyle of the humerus to the base of the 5th metacarpal

Question 4

What are the attachments of the extensor digitorium msucle?

Answer 4

from the lateral epicondyle of the humerus to the extensor expansions of digits 2-5

Question 5

What are the attachments of the extensor digit minimi muscle? EDM

Answer 5

from the lateral epicondyle of the humerus to the digital expansion of the 5th digit

Question 6

What are the attachments of the brachioradialis?

Answer 6

from the lateral supracondylar ridge of the humerus to the distal radius lateral to the styloid process

Question 7

What are the superficial muscles of the posterior forearm?

Answer 7

Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor carpi ulnaris, Extensor digitorum, and Extensori digiti minimi

Question 8

What is the common extensor origin?

Answer 8

The lateral epicondyle of the humerus

Question 9

What are the actions of the brachioradialis muscle?

Answer 9

flexes the elbow

Question 10

What are the actions of the extensor carpi radialis longus muscle?

Answer 10

extends and abducts hand at wrist (radial deviation) & assists in flexion of the elbow

Question 11

What are the actions of the extensor carpi radialis brevis muscle?

Answer 11

extends and abducts hand at wrist (radial deviation)

Question 12

What are the actions of the extensor carpi ulnaris muscle?

Answer 12

extends and adducts hand at wrist (ulnar deviation)

Question 13

What are the actions of the extensor digitorum muscle?

Answer 13

extends phalanges (primarily at metacarpophalangeal, secondarily at interphalangeal)

extends hand at wrist

Question 14

What are the actions of the extensor digiti minimi muscle?

Answer 14

Extends 5th digit @ metacarpophalangeal and interphalangeal

Question 15

What are the innervations of the brachioradialis muscle?

Answer 15

radial nerve (C5-C6)

Question 16

What are the innervations of the extensor carpi radialis longus muscle?

Answer 16

radial nerve (C6-C8)

Question 17

What are the innervations of the extensor carpi radialis brevis muscle?

Answer 17

radial nerve (C6-C8)

Question 18

What are the innervations of the extensor digitorum muscle?

Answer 18

radial nerve (C6-C8)

Question 19

What are the innervations of the extensor digiti minimi muscle?

Answer 19

radial nerve (C7-C8)

Question 20

What are the innervations of extensor carpi ulnaris muscle?

Answer 20

radial nerve (C6-C8)

Question 21

What are the deep muscles of the posterior forearm?

Answer 21

Supinator and Extensor Indicis

Question 22

What are the attachments of the supinator muscle?

Answer 22

from the lateral epicondyle of the humerus, radial collateral ligament & supinator crest of the ulna to the lateral surface of the proximal radius

Question 23

What are the attachments of the extensor indicis muscle?

Answer 23

from the posterior surface of the ulna & interosseous membrane to the digital expansion of the 2nd digit

Question 24

what are the actions of the supinator muscle?

Answer 24

supinates forearm

Question 25

What are the actions of the extensor indicis muscle?

Answer 25

extends 2nd digit @ metacarpophalangeal and interphalangeal

Question 26

What are the innervations of the supinator muscle?

Answer 26

radial nerve

Question 27

What are the innervations of the extensor indicis muscle?

Answer 27

radial nerve

Question 28

What are the outcropping thumb muscles of the posterior forearm?

Answer 28

Abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus

Question 29

What are the attachments of the abductor pollicis longus?

Answer 29

from the proximal posterior radius, ulna & interosseous membrane for the base of the 1st metacarpal & trapezium

Question 30

What are the attachments of the extensor pollicis longus?

Answer 30

from the middle 1/3 of the posterior surface of the ulna & interosseous membrane to the base of the 1st distal phalanx

Question 31

What are the attachments of the extensor pollicis brevis?

Answer 31

from the posterior radial surface of the ulna & interosseous membrane to the base of the 1st distal phalanx

Question 32

What are the actions of the abductor pollicis longus?

Answer 32

abducts & extends thumn at carpometacarpal joint | & abducts hand at wrist (radial deviation)

Question 33

What are the actions of the extensor pollicis longus?

Answer 33

extends thumb @ CMC, metacarpophalangeal & interpahalngeal joints

Question 34

What are the actions of the extensor pollicis brevis?

Answer 34

extends thumb @ metacarpophalangeal | & extends and abducts CMC joint

Question 35

What are the innervations of the abductor pollicis longus?

Answer 35

radial nerve

Question 36

What are the innervations of the extensor pollicis longus?

Answer 36

radial nereve

Question 37

What are the innervations of the extensor pollicis brevis?

Answer 37

radial nerve

Question 38

What is the name of the thick, deep fascia extension of the antebrachial fascia?

Answer 38

Extensor retinaculum

Question 39

What are the contents of the extensor retinaculum?

Answer 39

6 muscles' tendons pass deep to the fascia 1. EPB and APL 2. EPR longus & brevis 3. EPL 4. Tendon sheath for extensor digitorum & extensor indicis 5. Extensor digit minimi 6. Extensor carpi ulnaris

Question 40

What are the general actions of the extensor retinaculum?

Answer 40

Directs tendons in a precise way for precis movements

Question 41

The skin of the posterior medial forearm is associated with which dermatome?

Answer 41

T1

Question 42

The skin of the axillary region is associated with which dermatome?

Answer 42

T2

Question 43

The dermatome of the axillary region is associated with which spinal nerve?

Answer 43

T2

Question 44

The dermatome of the proximal half of the posterior and anterior medial arm is associated with which spinal nerve?

Answer 44

T2

Question 45

The dermatome of the anterior and posterior medial forearm and the skin of the distal half of the medial arm is associated with which spinal nerve?

Answer 45

T1

Question 46

The dermatome of the shoulder is associated with which spinal nerve?

Answer 46

C4

Question 47

The dermatome of the digits 4,5 is associated with which spinal nerve?

Answer 47

C8

Question 48

The dermatome of digits 2-4 is associated with which spinal nerve?

Answer 48

C7 | Primarily index finger

Question 49

The dermatome of the thumb is associated with which spinal nerve?

Answer 49

C6

Question 50

The dermatome of the lateral arm and forearm are associated with which spinal nerve?

Answer 50

C5