Posterior Forearm Muscles

Question 1

Brachioradialis (superficial)

Answer 1

Origin - lateral supracondylar ridge of humerus

Insertion - lateral part of the style I’d process

Innervation - radial nerve

Action - flexion of the elbow

Question 2

Extensor Capri radialis longus (superficial)

Answer 2

Origin - lateral supracondylar ridge of humerus

Insertion - base if the 2nd metacarpal bone

Innervation - radial nerve

Action - extension and abduction of the wrist

Question 3

Extensor Capri radialis brevis (superficial)

Answer 3

Origin - lateral supracondylar ridge of the humerus

Insertion - base of the 2nd and 3rd metacarpal

Innervation - radial nerve

Action - extension and abduction of the wrist

Question 4

Extensor digitorum (superficial)

Answer 4

Origin - lateral epicondyle of humerus

Insertion - distal phalanx of 2nd-5th digit

Innervation - radial nerve

Action - extension of all joints in 2nd-5th digits

Question 5

Extensor digits minimi (superficial)

Answer 5

Origin - lateral epicondyle of humerus

Insertion - distal phalanx of 5th digit

Innervation - radial nerve

Action - extension of all joints the if the 5th digit and the wrist

Question 6

Extensor Capri ulnaris (superficial)

Answer 6

Origin - lateral epicondyle of humerus and posterior ulna

Insertion - 5th metacarpal

Innervation - radial nerve

Action - extension and adduction of the wrist

Question 7

Anconeus (superficial)

Answer 7

Origin - lateral epicondyle of humerus

Insertion - olecrannon and ulna proximally

Innervation - radial nerve

Action - moves ulna during pronation and extends forearm

Question 8

Extensor indices (deep)

Answer 8

Origin - lateral ulna and interosseous membrane

Insertion - extensor digitorum tendon

Innervation - radial nerve

Action - extension of all joints in the index finger

Question 9

Extensor pollicis longus (deep)

Answer 9

Origin - lateral ulna

Insertion - distal phalanx

Innervation - radial nerve

Action - extension of all joins In The thumb

Question 10

Extensor pollicis brevis (deep)

Answer 10

Origin - posterior distal ulna

Insertion - distal phalanx of fist digit

Innervation - radial nerve

Action - extension of first two joints of the thumb

Question 11

Abductor pollicis longus

Answer 11

Origin - middle 1/3 of ulna interosseous membrane

Insertion - 1st metacarpal bone

Innervation - radial nerve

Action - abduction of the thumb

Question 12

Supination (deep)

Answer 12

Origin - supinator rest and lateral epicondyle of humerus

Insertion - lateral 1/3 of the proximal radius

Innervation - radial nerve

Action - supination