Muscles of the Forearm - attachments, innervations, actions

Question 1

abductor pollicis longus inn and s.c. segment

Answer 1

-inn: radial nerve
-s.c. segment: C6-8

Question 2

abductor pollicis longus attachments

Answer 2

from proximal posterior radius, ulna, and interosseous membrane to the base of the 1st metacarpal and trapezium

Question 3

abductor pollicis longus actions

Answer 3

-abducts and extends thumb at carpometacarpal joint
-abducts hand at wrist (radial deviation)

Question 4

brachioradialis inn. and s.c. segment

Answer 4

-inn: radial nerve
-s.c. segment: C5-6

Question 5

brachioradialis attachments

Answer 5

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

Question 6

brachioradialis actions

Answer 6

flexes elbow

Question 7

extensor carpi radialis brevis inn. and s.c. segment

Answer 7

-inn: radial nerve
-s.c. segment: C6-8

Question 8

extensor carpi radialis brevis attachments

Answer 8

from lateral epicondyle of humerus (common extensor origin) to base of the 3rd metacarpal

Question 9

extensor carpi radialis brevis actions

Answer 9

extends and abducts hand at wrist (radial deviation)

Question 10

extensor carpi radialis longus inn. and s.c. segment

Answer 10

-inn.: radial nerve
-s.c. segment: C6-8

Question 11

extensor carpi radialis longus attachments

Answer 11

from lateral supracondylar ridge of humerus to base of the 2nd metacarpal

Question 12

extensor carpi radialis longus actions

Answer 12

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

Question 13

extensor carpi ulnaris inn. and s.c. segment

Answer 13

-inn.: radial nerve
-s.c. segment: C6-8

Question 14

extensor carpi ulnaris attachments

Answer 14

from lateral epicondyle of humerus (common extensor origin) to base of the 5th metacarpal

Question 15

extensor carpi ulnaris actions

Answer 15

extends and adducts hand at wrist (ulnar deviation)

Question 16

extensor digitorum inn. and s.c. segment

Answer 16

-inn.: radial nerve
-s.c. segment: radial nerve

Question 17

extensor digitorum attachments

Answer 17

from lateral epicondyle of the humerus (common extensor origin) to extensor expansions of digits 2-5

Question 18

extensor digitorum actions

Answer 18

extends phalanges (primarily at metacarpophalangeal, secondarily at interphalangeal) and hand and wrist

Question 19

extensor digiti minimi inn. and s.c. segment

Answer 19

-inn.: radial nerve
-s.c. segment: C7-8

Question 20

extensor digiti minimi attachments

Answer 20

from lateral epicondyle of humerus (common extensor origin) to digital expansion of 5th digit

Question 21

extensor digiti minimi actions

Answer 21

extends 5th digit (metacarpophalangeal and interphalangeal)

Question 22

extensor indicis inn. and s.c. segment

Answer 22

-inn.: radial nerve
-s.c. segment: C7-8

Question 23

extensor indicis attachments

Answer 23

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

Question 24

extensor indicis actions

Answer 24

extends 2nd digit (metacarpophalangeal and interphalangeal)

Question 25

extensor pollicis brevis inn. and s.c. segment

Answer 25

-inn.: radial nerve -s.c. segment: C6-8

Question 26

extensor pollicis brevis attachments

Answer 26

from the posterior radial surface and interosseous membrane to the base of the 1st proximal phalanx

Question 27

extensor pollicis brevis actions

Answer 27

extends thumb (metacarpophalangeal) and extends and abducts CMC joint

Question 28

extensor pollicis longus inn. and s.c. segment

Answer 28

-inn.: radial nerve -s.c. segment: C6-8

Question 29

extensor pollicis longus attachments

Answer 29

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

Question 30

extensor pollicis longus actions

Answer 30

extends thumb (CMC and metacarpophalangeal and interphalangeal)

Question 31

flexor carpi radialis inn. and s.c. segment

Answer 31

-inn.: median nerve -s.c. segment: C6-8

Question 32

flexor carpi radialis attachments

Answer 32

from medial epicondyle (common flexor origin) to the palmar aspect of the base of the 2nd metacarpal

Question 33

flexor carpi radialis actions

Answer 33

-flexes and abducts hand at wrist (radial deviation) -may assist in pronation of forearm and flexion of elbow

Question 34

flexor carpi ulnaris inn. and s.c. segment

Answer 34

-inn.: ulnar nerve -s.c. segment: C7-T1

Question 35

flexor carpi ulnaris attachments

Answer 35

from medial epicondyle (common flexor origin) of the humerus and proximal ulnar shaft to the pisiform

Question 36

flexor carpi ulnaris actions

Answer 36

flexes and adducts hand at wrist (ulnar deviation) and assists in flexor of elbow

Question 37

flexor digitorum profundus inn. and s.c. segment

Answer 37

-inn.: median (anterior interosseous nerve; 2nd and 3rd digits) and ulnar (4th and 5th digits) -s.c. segment: C7-T1

Question 38

flexor digitorum profundus attachments

Answer 38

from anterior proximal two thirds of ulna and interosseous membrane to the base of the distal phalanges of digits 2-5

Question 39

flexor digitorum profundus actions

Answer 39

-flexion of digits 2-5 (metacarpophalangeal and distal interphalangeal and proximal interphalangeal) -flexion of hand at wrist

Question 40

flexor digitorum superficialis (C7-T1) inn. and s.c. segment

Answer 40

-inn.: median nerve -s.c. segment: C7-T1

Question 41

flexor digitorum superficialis attachments

Answer 41

from medial epicondyle (common flexor origin) of humerus to sides of the middle phalanges of digits 2-5

Question 42

flexor digitorum superficialis actions

Answer 42

flexion of digits (metacarpophalangeal and proximal interphalangeal) and hand at wrist

Question 43

flexor pollicis longus inn. and s.c. segment

Answer 43

-inn.: median nerve (anterior interosseous nerve) -s.c. segment: C7-T1

Question 44

flexor pollicis longus attachments

Answer 44

from anterior surface of the radius and interosseous membrane to the base of the distal phalanx of the thumb

Question 45

flexor pollicis longus actions

Answer 45

flexes thumb (metacarpophalangeal and interphalaneal)

Question 46

palmaris longus inn. and s.c. segment

Answer 46

-inn.: median nerve -s.c. segment: C7-8

Question 47

palmaris longus attachments

Answer 47

from medial epicondyle of humerus (common flexor origin) to the palmar aponeurosis

Question 48

palmaris longus actions

Answer 48

flexes hand at wrist and tenses palmar fascia

Question 49

pronator quadratus inn. and s.c. segment

Answer 49

-inn.: median nerve (anterior interosseous nerve) -s.c. segment: C8-T1

Question 50

pronator quadratus attachments

Answer 50

from the anterior surface of the distal ulna to the anterior surface of distal radius

Question 51

pronator quadratus actions

Answer 51

pronates the forearm

Question 52

pronator teres inn. and s.c. segment

Answer 52

-inn.: median nerve -s.c. segment: C6-7

Question 53

pronator teres attachments

Answer 53

from medial epicondyle and ulnar conoid process to lateral aspect of radius

Question 54

pronator teres actions

Answer 54

pronates and flexes forearm

Question 55

supinator inn. and s.c. segment

Answer 55

-inn.: radial nerve -s.c. segment: C5-6

Question 56

supinator attachments

Answer 56

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

Question 57

supinator actions

Answer 57

supinates forearm