ANAT 5010 - unit 8

origin: lateral epicondyle

insertion: distal radius near styloid process

action: flex forearm at elbow

innervation: main trunk of radial nerve

what is the origin, insertion, action, and innervation of the brachioradialis?

- brachioradialis

- extensor carpi radialis longus

- extensor carpi radialis brevis

- extensor digitorum

- extensor digit minimi

- extensor carpi ulnaris

- anconeus

what muscles are in the superficial layer of the posterior forearm?

lateral epicondyle

what is the common origin of all the muscles in the superficial layer of the posterior forearm?

insertion: base of 2nd metacarpal

innervation: main trunk of radial nerve

what is the insertion and innervation of the extensor carpi radialis longus?

insertion: base of 3rd metacarpal

innervation: deep branch of radial nerve

what is the insertion and innervation of the extensor carpi radialis brevis?

insertion: extensor hood of digits 2-5, middle and distal phalanges

innervation: posterior interosseus

what is the insertion and innervation of the extensor digitorum?

insertion: extensor hood of 5th digit

innervation: posterior interosseus

what is the insertion and innervation of the extensor digiti minimi?

insertion: base of 5th metacarpal

innervation: posterior interosseus

what is the insertion and innervation of the extensor carpi ulnaris?

insertion: upper ulna

innervation: main trunk of radial nerve

what is the insertion and innervation of the anconeus?

origin: lateral epicondyle

insertion: radius

innervation: deep branch of radial nerve

what is the origin, insertion, and innervation of the supinator?

origin: radius and ulna

insertion: base of 1st metacarpal

innervation: posterior interosseous

what is the origin, insertion, and innervation of the abductor pollicis longus?

origin: radius

insertion: proximal phalanx of thumb

innervation: posterior interosseous

what is the origin, insertion, and innervation of the extensor pollicis brevis?

origin: ulna

insertion: base of distal phalanx of thumb

innervation: posterior interosseous

what is the origin, insertion, and innervation of the extensor pollicis longus?

origin: ulna

insertion: extensor hood of index finger

innervation: posterior interosseous

what is the origin, insertion, and innervation of the extensor indicis?

supinator

what is the landmark for the name change from the deep branch of the radial nerve to the posterior interosseous?

extensor pollicis longus

what muscle changes direction at the dorsal radial tubercle?

abductor pollicis longus and extensor pollicis brevis

what muscles are in the first compartment of the extensor retinaculum?

extensor carpi radialis longus and extensor carpi radialis brevis

what muscles are in the second compartment of the extensor retinaculum?

extensor pollicis longus

what muscle is in the third compartment of the extensor retinaculum?

extensor indicis and extensor digitorum

what muscles are in the fourth compartment of the extensor retinaculum?

extensor digit minimi

what muscle is in the fifth compartment of the extensor retinaculum?

extensor carpi ulnaris

what muscle is in the sixth compartment of the extensor retinaculum?

medial: extensor pollicis longus

lateral: extensor pollicis brevis and abductor pollicis longus

what are the boundaries for the anatomical snuffbox?

- radial artery

- scaphoid

- ECRL and ECRB tendons

what are the contents of the anatomical snuffbox?

at the supinator (deep goes deep to supinator)(superficial goes above)

where does the radial nerve split to a deep and superficial branch?

- brachioradialis

- extensor carpi radialis longus

- anconeus

what does the main trunk of the radial nerve supply in the posterior forearm?

- extensor carpi radialis brevis

- supinator

what does the deep branch of the radial nerve supply in the posterior forearm?

- extensor digitorum

- extensor digiti minimi

- extensor carpi ulnaris

- all muscles of the deep layer (except the supinator)

what does the posterior interosseous nerve supply in the posterior forearm?