78The Finkelstein test draws the tendons of the first dorsal compartment distally and causes sharp, local pain when tendon entrapment has occurred and inflammation is presentIn de Quervain tenosynovitis, the first dorsal compartment is thickened, raising the skin and creating a prominence at the radial styloid
86Fovea radialis (enfiye çukuru): -İçte M. extensor pollicis longus, -dışta M. abductor pollicis longus ve M. extensor pollicis brevis krişleri,-aşağıda başparmağın dorsal yüzü arasındaki çukurluktur.-Baş parmağı ekstensiyon durumuna getirirsek, bu çukurda deri çökerek çukur belirginleşir.-Bu çukurdan A. radialis geçer.
95Superficial layerBrachioradialisProximal two thirds of supraepicondylar ridge of humerusLateral surface of distal end of radius proximal to styloid processRadial nerve (C5, C6, C7)Relatively week flexion of forearm, maximal when forearm is in midpronated positionExtensor carpi radialis longus (ECRL)Lateral supraepicondylar ridge of humerusDorsal aspect of base of 2nd metacarpalRadial nerve (C6, C7)Extend and abduct hand at the wrist joint; ECRL active during fist clenchingExtensor carpi radialis brevis (ECRB)Lateral epicondyle of humerus (common extensor origin)Doral aspect of base of 3rd metacarpalDeep branch of radial nerve (C7, C8)Extensor digitorumExtensor expansions of medial four fingersPosterior interosseous nerve (C7, C8), continuation of deep branch of radial nerveExtends medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal jointsExtensor digiti minimi (EDM)Extensor expansion of 5th fingerExtends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal jointExtensor carpi ulnaris (ECU)Lateral epicondyle of humerus; posterior border of ulna via a shared aponeurosisDorsal aspect of base of 5th metacarpalExtends and adducts hand at wrist joint (also active during fist clenching)Deep layerSupinatorLateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa; crest of ulnaLateral posterior, and anterior surfaces of proximal third of radiusSupinates forearm; rotates radius to turn palm anteriorlyor superiorly (if elbow is flexed)Extensor indicisPosterior surface of distal third of ulna and interosseous membraneExtensor expansion of 2nd fingerExtends 2nd finger (enabling its independent extension); helps extend hand at wristOutcropping muscles of deep layerAbductor pollicis longus (APL)Posterior surface of proximal halves of ulna, radius, and interosseous membraneBase of 1st metacarpalAbducts thumb and extends it at carpometacarpal jointExtensor pollicis longus (EPL)Posterior surface of middle third of ulna and interosseous membraneDorsal aspect of base of distal phalanx of thumbExtends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal jointsExtensor pollicis brevis (EPB)Posterior surface of distal third of radius and interosseous membraneDorsal aspect of base of proximal phalanx of thumbExtends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal jointaThe spinal cord segmental innervation is indicated (e.g., â€œC7, C8â€ means that the nerves supplying the extensor carpi radialis brevis are derived from the seventh and eighth cervical segments of the spinal cord). Numbers in boldface (C7) indicate the main segmental innervation. Damage to one or more of the listed spinal cord segments or to the motor nerve roots arising from them results in paralysis of the muscles concerned.