Gross Anatomy I Lecture - Deep posterior forearm muscles

what are the origins of supinator?

1. lateral epicondyle/humerus

2. supinator crest/ulna

what is the insertion of supinator?

shaft/radius

what action does supinator carry out?

supinates forearm

what is the innervation of supinator?

radial nerve

what are the origins of abductor pollicis longus?

1. shaft/ulna

2. shaft/radius

3. interosseous membrane

what is the insertion of abductor pollicis longus?

first metacarpal

what actions does abductor pollicis longus carry out?

1. abducts digit 1 at CM joint

2. extends digit 1

what is the innervation of abductor pollicis longus?

radial nerve

what are the origins of extensor pollicis brevis?

1. shaft/radius

2. interosseous membrane

what is the insertion of extensor pollicis brevis?

proximal phalanx/digit 1

what action does extensor pollicis brevis carry out?

extends digit 1 at MP joint

what is the innervation of extensor pollicis brevis?

radial nerve

what are the origins of extensor pollicis longus?

1. shaft/ulna

2. interosseous membrane

what is the insertion of extensor pollicis longus?

distal phalanx/digit 1

what action does extensor pollicis longus carry out?

extends digit 1 at IP joint

what is the innervation of extensor pollicis longus?

radial nerve

what are the origins of extensor indicis?

1. shaft/ulna

2. interosseous membrane

what is the insertion of extensor indicis?

proximal phalanx/digit 2

what actions does extensor indicis carry out?

extends digit 2

what is the innervation of extensor indicis?

radial nerve

what is the origin of anconeus?

lateral epicondyle/humerus

what are the insertions of anconeus?

1. olecranon process

2. posterior proximal shaft/ulna

what action does anconeus carry out?

extends forearm

what is the innervation of anconeus?

radial nerve