Upper Extremity: the Forearm

Question 1

flexor compartment of the forearm is on the __ aspect. Has __ muscles.

The extensor compartment is on the __ aspect. Has __ muscles.

Answer 1

Flexor compartment of the forearm is on the anterior aspect. Has pronator muscles.

The extensor compartment is on the posterior aspect. Has supinator muscles.

Question 2

The flexor muscles arise on the __ epicondyle of the humerus.

The extensors arise on the ___ epicondyle.

Answer 2

The flexor muscles arise on the medial epicondyle of the humerus.

The extensors arise on the lateral epicondyle.

Question 3

4 muscles of the SUPERFICIAL ANTERIOR compartment of the forearm (flexor/pronator)

Answer 3

• pronator teres
• flexor carpi radialis
• palmaris longus
• flexor carpi ulnas

Question 4

OIF of pronator teres (superficial anterior forearm)

Answer 4

o; medial epicondyle of humerus

i; lateral shaft of radius

f; pronation at radioulnar joint. Flexion at the elbow.

Question 5

OIF of flexor carpi radialis

Answer 5

recal;; it’s part of anterior forearm superficial layer

o; medial epicondyle of humerus

i; bases of 2nd and 3rd metacarpal bones (anterior)

f; flexion at wrist. abduction at wrist.

• flexion at elbow

Question 6

OIF of flexor carpi ulnaris

Answer 6

o; medial epicondyle of humerus

I; base of 5th metacarpal bone (anterior)

f; flexion at wrist, adduction at wrist

• flexion at elbow

Question 7

intermediate layer of the anterior forearm (OIF)

Answer 7

flexor digitorum superficialis.

o ;medial epicondyle of humerus and radius

i; middle phalanges of 2nd-5th digits (anterior)

F; flexion of 2nd-5th digits. flexion at wrist. flexion at elbow.

Question 8

the ___ ___ __ muscle is a powerful hand flexor excepto for the ___ joints. it connects tendons from the digits 2-5

Answer 8

the SDF: flexor digitorum superficialis

Question 9

deep anterior muscles (3) of the forearm

Answer 9

1. flexor digitorum profundus
2. flexor pollicis longus
3. pronator quadratus

Question 10

OIF of flexor digitorum profundus (DDF)

Answer 10

o; lateral epicondyle of the ulna

i; distal ends of the 2nd-5th digit (not the thumb)

f; flexes all the joints including the DIP. also flexes the wrist.

Question 11

OIF of the flexor pollicis longus

Answer 11

O; radius

i; distal phalanx of thumb

f; flexion of thumb/first digit, flexion at wrist

Question 12

OIF of pronator quadratus

Answer 12

distal anterior surface ulna

i; distal anterior surface radius

f; pronation at radioulnar joint

Question 13

Posterior compartment superficial muscles (extensor/supinator)

Answer 13

1. anconeous
2. extensor carpi ulnaris
3. extensor digitorum
4. extensor digiti minimi

Question 14

Answer 14

Question 15

common extensor (posterior forarm) origin

Answer 15

on the lateral epicondyle of the humerus

Question 16

OIF of the brachioradialis

Answer 16

O; the lateral epicondyle of the humerus

I; distal radius

F; flexion at elbow

Question 17

OIF of extensor carpi radialis

Answer 17

o; lateral epicondyle of humerus

i; bases of the 2nd and third metacarpal bones (bosterior)

f; extension at rist, abduction at wrist

• extension at elbow

Question 18

OIF of extensor digitorum

Answer 18

o; lateral epicondyle of humus

i; distal phalanges (2-5th digit posterior)

f; flexion of digits besides thumb, extension of wrist

Question 19

OIF of extensor carpi ulnaris

Answer 19

o; lateral epicondyl of humerus

i; base of 5th metacarpal bone (pinky)(posterior)

f; extension at wrist, adduction at wrist, extension at elbow

Question 20

what is the 1 posterior forearm muscle that is not involved with the extension of the wrist

Answer 20

the brachioradialis. it is involved with flexion at the elbow

Question 21

deep layer of posterior foraem muscles (extensor muscles)

Answer 21

1. supinator
2. abductor pollicis longus
3. extensor pollicis longus and brevis
4. extensor indicis

Question 22

Answer 22

Question 23

OIF of supinator (deep layer posterior forearm)

Answer 23

o; lateral epicondyle of humerus and olecranon process of ulna

i; lateral surface of radius

f; supination at radioulnar joint

Question 24

OIF of abductor pollicus longus ((deep layer posterior forearm)

Answer 24

o; posterior surface of radius and ulna

i; base of first metacarpal

f; abduction of thumb

Question 25

OIF of extensor pollicus longus and brevis ((deep layer posterior forearm)

Answer 25

o; posteiror surface of ulna

i; base of first distal phalanx

f;; extension of thumb

Question 26

OIF of extensor indicis (deep layer posterior forearm)

Answer 26

o; posterior surface of ulna

i; distal phalanges of 2nd digits (pointerindex finger)

f; extension of 2nd digit, extension at wrist.

Question 27

Radialis group of posterior muscles

Answer 27

Brachioradialis (superficial)
Extensor carpi radialis longus (superficial)
Extensor carpi radialis brevis superficial

Question 28

Palmar flexion: mainly __ carpi muscles
Dorsoflexion: mainly __ carpi muscles
Ulnar deviation (adduction): __ and __ carpi ulnaris

Answer 28

Palmar flexion: mainly FLEXOR anteriorcarpi muscles
Dorsoflexion: mainly EXTENSOR posterior carpi muscles
Ulnar deviation (adduction): FLEXOR and EXTENSOR carpi ulnaris

Question 29

Extensor pollicis longus and brevis pass through and create the anatomical __ __. The radial artery also runs underneath the structure.

Answer 29

Extensor pollicis longus and brevis pass through and create the anatomical snuff box. The radial artery also runs underneath the structure