Extensors And Posterior Surface Of The Forearm

Front 1

First compartment

Back 1

tendons of the abductor pollicis longus muscle and the extensor pollicis brevis muscle,

Front 2

tendons of the extensor carpi radialis longus muscle and the extensor carpi radialis brevis muscle

Back 2

second compartment

Front 3

third compartment

Back 3

tendon of the extensor pollicis longus muscle

Front 4

fourth compartment

Back 4

tendons of the extensor digitorum communis muscle and extensor indicis muscle [the extensor retinaculum in this region has been cut],

Front 5

fifth compartment

Back 5

tendons of the extensor digiti minimi muscle, and

Front 6

sixth compartment

Back 6

- tendon of the extensor carpi ulnaris muscle.

Front 7

Before dividing, the main trunk of the radial nerve

Back 7

gives branches to the brachioradialis muscle, extensor carpi radialis longus muscle, and anconeus muscle.

Front 8

The deep branch of the radial nerve supplies the

Back 8

supinator muscle and the extensor carpi radialis brevis muscle.

Front 9

Brachioradialis

Back 9

lateral supracondylar ridge of the humerous and lateral surface of the distal end of the radius above the syloid process, RADIAL nerve, flexe forearm

Front 10

Extensor Carpi radialis longus

Back 10

lateral supracondylar ridge of humerous to the base of the second netacarpal, RADIAL NERVE, extends and abducts hand at wrist joint

Front 11

extensor carpi radialis brevis

Back 11

lateral epicondyle of the humerous to base of the 3rd metacarpal DEEP BRANCH OF THE RADIAL-to extend and abduct the hand at the wrist joint

Front 12

extensor digitorum

Back 12

lateral epicondyle of the humerous to the extensor expansion of medial four digits. Posterior Interossesus to extend medial four digits at DIP PIP and Metacarpophal. extends wrist

Front 13

Extensor Digiti minimi

Back 13

Lateral Epicondyle of the humerous to extensor expansion of fifth digit. POsterior interossesu n. a branch of the radial. Extends digit 5 at metacarpophalangeal joint and inerpahalangeal joints

Front 14

extensor carpi ulnaris

Back 14

lateral epicondyle of the humerous and posterior border of ulna to the base of the 5th metacarpal-POSTERIOR INTEROSSEUS N. to extend and adduct hand at wrist joint.

Front 15

Supinator

Back 15

lateral epi of humerous, radial collateral and annular ligaments, suppinator fossa and crest of the ulna to proximal lateral third of radius. DEEP BRANCH to suppinate forearm and rotate radius to turn palm anteriorly

Front 16

ABDUCTOR pollicis Longus

Back 16

Posterior Surface of the radius and interosseus membrane to the base of the 1st metacarpal, POSTERIOR INTEROSSEUS N., abducts thumb and extends it at carpometacarpal joint

Front 17

Extensor Pollicis Brevis

Back 17

Posterior surface of the radisu and interosseus membrane bellow abd pol long to proximal phalanx. POSTERIOR INTEROSSESU TO EXTEND DISTAL PHALANX OF THUMB AT INTERPHALANGEAL Joint

Front 18

EXTENSOR INDICIS

Back 18

posterior surface of the ulna and interosseus membrane below att. of ext. pol. longus to Extensor expansion of second digit posterior interossesu to extend digit 2 and extend wrist.

Front 19

extensor retinaculum

Back 19

represents a thickening of the posterior antebrachial fascia at the wrist. Lateral border of the radius to the medial border of the ulnar styloid process and the triquetral and pisiform bones. MUst know the compartments.

Front 20

radial nerve approaches the side of the elbow and gives off

Back 20

branches to the brachioradialis m. and extensor carpi radialis longus muscle. As it nears the suppinator it divides

Front 21

the superficial branch deep to the brachioradilis

Back 21

is exclusively sensory. The deep branch supplies the EXTENSOR CARPI RADIALIS BREVIS AND SUPPINAOTR

Front 22

Posterio interossesu travels

Back 22

deep to the superficial muscles but superfcial to deep group

Front 23

Post. inter

Back 23

innervates the rest of the forearm muslces besides brevis and the suppinator

Front 24

Interossesu artery is found within the cubital fossa and branches into the anterior and posterior interosseus
What about their course?

Back 24

Anterior interosseus artery travels down the forearm on the anterior surface of the interossesu membrane in company with the anterior interosseus nerve( median ).

Front 25

as the extensor tendon approaches the dorsal aspect of the

this is extensor hood

Back 25

metacarppphalangeal joints and expands laterally over the sides of the joints. There is a central thickening of the tendon and lateral components.

Front 26

extensor hood

Back 26

is the thickening of the extensor digitorum tendons over the metacarpophalangeal joints

Front 27

Extensor tendon continues to the proximal phalanx and

Back 27

is joined by the more obliquely oreinted fibers of the lumbrical and interosseus muslces. Forming a thin flat tendon known as the extensor expansion.

Front 28

Proximal to the proximal interphalangeal joint

Back 28

tendons of musles participating in the aponerousuis participate in a split that result sin three tendinous bands, a central one and two lateral ones.

Front 29

two lateral bands of extensor expansion

Back 29

come together on the distal prt of the middle phalanx to form a single tendon that crosses the dorsal interphalangeal joint to insert on the base of the distal phalanx.

Front 30

central band inserts

Back 30

on the middle phalanx

Front 31

dorsal carpal rete

Back 31

is simply a number of anastomotic loops from three arteries; dorsal carpal branch of the ulnar, dorsal carpal branch of the radial and distal end of the anterior interossesus.

Front 32

Dorsal metacarpal aa.

Back 32

come of the rete and divide into two dorsal digital arteries. Some give off perforating branches

Front 33

perforating of dorsal carpal rete

Back 33

join the palmar metacarpal with the proximal ends of the dorsal metacarpal