Forearm mm

Question 1

Abductor Pollicis Longus m

Answer 1

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

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

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 2

Brachioradialis m

Answer 2

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

actions- flexes the elbow

innervation- radial nerve

Common spinal cord segment: (C5-6)

Question 3

Extensor Carpi Radialis Brevis m

Answer 3

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

actions- extends & abducts hand at wrist (radial deviation)

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 4

Extensor Carpi Radialis Longus m

Answer 4

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

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

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 5

Extensor Carpi Ulnaris m

Answer 5

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

actions- extends & adducts hand at wrist (ulnar deviation)

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 6

Extensor Digitorum m

Answer 6

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

actions- extends phalanges (primarily at metacarpophalangeal, secondarily at interphalangeal) & hand at wrist

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 7

Extensor Digiti Minimi m

Answer 7

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

actions- extends 5th digit (metacarpophalangeal & interphalangeal)

innervation- radial nerve

Common spinal cord segment: (C7-8)

Question 8

Extensor Indicis m

Answer 8

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

actions- extends 2nd digit (metacarpophalangeal & interphalangeal)

innervation- radial nerve

Common spinal cord segment: (C7-8)

Question 9

Extensor Pollicis Brevis m

Answer 9

attachments- from the posterior radial surface & interosseous membrane to the base of the 1st proximal phalanx

actions- extends thumb (metacarpophalangeal) & extends & abducts CMC joint

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 10

Extensor Pollicis Longus m

Answer 10

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

actions- extends thumb (CMC & metacarpophalangeal & interphalangeal)

innervation- radial nerve

Common spinal cord segment: (C6-8)

Question 11

Flexor Carpi Radialis m

Answer 11

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

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

innervation- median nerve

Common spinal cord segment: (C6-8)

Question 12

Flexor Carpi Ulnaris m

Answer 12

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

actions- flexes & adducts hand at wrist (ulnar deviation) & assists in flexion of the elbow

innervation- ulnar nerve

Common spinal cord segment: (C7-T1)

Question 13

Flexor Digitorum Profundus m

Answer 13

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

actions- flexion of digits 2-5 (metacarpophalangeal & distal interphalangeal & proximal interphalangeal), & flexion of hand at wrist

innervation- median (anterior interosseous nerve; 2nd & 3rd digits) & ulnar (4th & 5th digits) nerves

Common spinal cord segment: (C7-T1)

Question 14

Flexor Digitorum Superficialis m

Answer 14

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

actions- flexion of digits (metacarpophalangeal & proximal interphalangeal), & hand at wrist

innervation- median nerve

Common spinal cord segment: (C7-T1)

Question 15

Flexor Pollicis Longus m

Answer 15

attachments- from the anterior surface of the radius & interosseous membrane to the base of the distal phalanx of the thumb

actions- flexes thumb (metacarpophalangeal & interphalangeal)

innervation- median nerve (anterior interosseous nerve)

Common spinal cord segment: (C7-T1)

Question 16

Palmaris Longus m

Answer 16

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

actions- flexes hand at wrist & tenses palmar fascia

innervation- median nerve

Common spinal cord segment: (C7-C8)

Question 17

Pronator Quadratus m

Answer 17

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

actions- pronates the forearm

innervation- median nerve (anterior interosseous nerve)

Common spinal cord segment: (C8-T1)

Question 18

Pronator Teres m

Answer 18

attachments- from the medial epicondyle & ulnar coronoid process to lateral aspect of the radius

actions- pronates & flexes forearm

innervation- median nerve

Common spinal cord segment: (C6-7)

Question 19

Supinator m

Answer 19

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

actions- supinates forearm

innervation- radial nerve

Common spinal cord segment: (C5-6)