Lab Manual 5 pt.2 Forearm

what are the muscles of the forearm?

• pronator teres

• flexor carpi radialis

• palmaris longus

• flexor carpi ulnaris

• flexor digitorum superficialis

• flexor digitroum profundus

• flexor pollicis longus

• pronator quadrates

what is the origin for pronator teres?

• humeral head: medial epicondyle and supracondylar ridge of humerus

• ulnar head: coronoid process of ulna

what is the insertion for pronator teres?

midshaft of radius

what is the action for pronator teres?

pronation and flexion of elbow

what is the innervation for pronator teres?

median n. (C5-T1)

what is the origin of the flexor carpi radialis?

medial epicondyle of humerus

what is the insertion of the flexor carpi radialis?

metacarpals 2 and 3

what is the action of the flexor carpi radialis?

• flexion and radial deviation of wrist

• weak elbow flexion

what is the innervation of the flexor carpi radialis?

median n. (C5-T1)

what is the origin of the palmaris longus?

medial epicondyle of humerus

what is the insertion of the palmaris longus?

palmar aponeurosis

what is the action of the palmaris longus?

• flexion of wrist

• weak elbow flexion

• tightened palmar aponeurosis

what is the innervation of the palmaris longus?

median n. (C5-T1)

what is the origin of the flexor carpi ulnaris?

• humeral head: medial epicondyle

• ulnar head: olecranon and posterior border of ulna

what is the insertion of the flexor carpi ulnaris?

pisiform, hamate, and metacarpal 5

what is the action of the flexor carpi ulnaris?

• weak elbow flexion

• wrist flexion

• ulnar deviation

what is the innervation of the flexor carpi ulnaris?

ulnar n. (C8-T1)

what is the origin of the flexor digitorum superficialis?

• medial epicondyle

• coronoid process of the ulna

• anterior border of the radius

what is the insertion of the flexor digitorum superficialis?

lateral surfaces of the middle phalanx of digits 2-5

what is the action of the flexor digitorum superficialis?

• flexion of

  • wrist

  • metacarpophalangeal and proximal interphalangeal joints

what is the innervation of the flexor digitorum superficialis?

median n. (C5-T1)

what is the origin of the flexor digitorum profundus ?

medial surfaces of proximal ulna and interosseous membrane

what is the insertion of the flexor digitorum profundus ?

distal phalanges of digits 2-5

what is the action of the flexor digitorum profundus ?

• flexion of joints from wrist to distal interphalangeal joints

what is the innervation of the flexor digitorum profundus ?

• medial part: ulnar n. (C8-T1)

• Lateral part: Anterior interosseous n. (C5-T1)

what is the origin of the flexor pollicis longus ?

radius and interosseous membrane

what is the insertion of the flexor pollicis longus ?

distal phalanx of digit 1

what is the action of the flexor pollicis longus ?

flexion of the thumb

what is the innervation of the flexor pollicis longus ?

anterior interosseous n. (C5-T1)

what is the origin of the pronator quadrates ?

distal anterior ulna

what is the insertion of the pronator quadrates ?

distal anterior radius

what is the action of the pronator quadrates ?

pronation of elbow

what is the innervation of the pronator quadrates ?

anterior interosseous n. (C5-T1)

what muscles are in the posterior forearm?

• anconeus

• brachioradialis

• extensor carpi radialis longus

• extensor carpi radialis brevis

• extensor digitorum

• extensor digiti minimi

• extensor carpi ulnaris

• supinator

• abductor pollicis longus

• extensor pollicis brevis

• extensor pollicis longus

• extensor indicis

what is the origin of the anconeus?

lateral epicondyle of humerus

what is the insertion of the anconeus?

olecranon process of the ulna

what is the action of the anconeus?

extension of elbow

what is the innervation of the anconeus?

radial n. (C5-T1)

what is the origin of the brachioradialis?

lateral supracondylar ridge of humerus

what is the insertion of the brachioradialis?

styloid process of the radius

what is the action of the brachioradialis?

flexion of elbow

what is the innervation of the brachioradialis?

radial n. (C5-T1)

what is the origin of the extensor carpi radialis longus ?

lateral supracondylar ridge of humerus

what is the insertion of the extensor carpi radialis longus ?

metacarpal 2

what is the action of the extensor carpi radialis longus ?

extension and radial deviation of wrist

what is the innervation of the extensor carpi radialis longus ?

radial n. (C5-T1)

what is the origin of the extensor carpi radialis brevis ?

lateral epicondyle of humerus

what is the insertion of the extensor carpi radialis brevis ?

metacarpals 2 and 3

what is the action of the extensor carpi radialis brevis ?

extension and radial deviation of wrist

what is the innervation of the extensor carpi radialis brevis ?

posterior interosseous n. (C7-C8)

what is the origin of the extensor digitorum?

lateral epicondyle of humerus

what is the insertion of the extensor digitorum?

dorsal digital expanison of digits 2-5

what is the action of the extensor digitorum?

extension of wrist and digits

what is the innervation of the extensor digitorum?

posterior interosseous n. (C7-C8)

what is the origin of the extensor digiti minimi?

lateral epicondyle of humerus

what is the insertion of the extensor digiti minimi?

dorsal digital expansion of digit 5

what is the action of the extensor digiti minimi?

extension of digit 5

what is the innervation of the extensor digiti minimi?

posterior interosseous n. (C7-C8)

what is the origin of the extensor carpi ulnaris?

lateral epicondyle of humerus and posterior ulna

what is the insertion of the extensor carpi ulnaris?

metacarpal 5

what is the action of the extensor carpi ulnaris?

extension and ulnar deviation of wrist

what is the innervation of the extensor carpi ulnaris?

posterior interosseous n. (C7-C8)

what is the origin of the supinator?

lateral epicondyle and supinator crest of ulna

what is the insertion of the supinator?

lateral surface of radius

what is the action of the supinator?

supination of forearm

what is the innervation of the supinator?

posterior interosseous n. (C7-C8)

what is the origin abductor pollicis longus?

ulna, radius, and interosseous membrane

what is the insertion of the abductor pollicis longus?

metacarpal 1

what is the action of the abductor pollicis longus?

abduction of thumb

what is the innervation of the abductor pollicis longus?

posterior interosseous n. (C7-C8)

what is the origin of the extensor pollicis brevis?

radius and interosseous membrane

what is the insertion of the extensor pollicis brevis?

proximal phalanx of digit 1

what is the action of the extensor pollicis brevis?

extension of thumb at metacarpophalangeal and carpometacarpal joints

what is the innervation of the extensor pollicis brevis?

posterior interosseous n. (C7-C8)

what is the origin of the extensor pollicis longus ?

ulna and interosseous membrane

what is the insertion of the extensor pollicis longus ?

distal phalanx of digit 1

what is the action of the extensor pollicis longus ?

extension of thumb

what is the innervation of the extensor pollicis longus ?

posterior interosseous n. (C7-C8)

what is the origin of the extensor indicis ?

ulna and interosseous membrane

what is the insertion of the extensor indicis ?

dorsal digital expansion of digit 2

what is the action of the extensor indicis ?

extension of digit 2

what is the innervation of the extensor indicis ?

posterior interosseous n. (C7-C8)