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Glossary of Anatomy Muscles 375-400

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Deep innervation
Nerve
Extensor Digitorum origin and insertion
origin: Lateral epicondyle of humerus; insertion: By four tendons into extensor expansions and distal phalanges of fingers 2-5
Extensor Carpi Ulnaris action
Extends and adducts wrist (in conjunction with flexor carpi ulnaris)
Extensor Carpi Ulnaris innervation
Posterior interosseous nerve
Extensor Carpi Radialis Brevis origin and insertion
origin: Lateral epicondyle of humerus; insertion: Base of third metacarpal
Extensor Digitorum action
Prime mover of finger extension; extends wrist; can abduct (flare) fingers
Extensor Digitorum innervation
Posterior interosseous nerve (branch of radial nerve)
Extensor Carpi Radialis Longus origin and insertion
origin: Lateral supracondylar ridge of humerus; insertion: Base of second metacarpal
Extensor Carpi Radialis Brevis action
Extends and abducts wrist; acts synergistically with extensor carpi radialis longus to steady wrist during finger flexion
Extensor Carpi Radialis Brevis innervation
Deep branch of radial nerve
Superficial origin and insertion
origin: Origin; insertion: Insertion
Extensor Carpi Radialis Longus action
Extends and abducts wrist
Extensor Carpi Radialis Longus innervation
Radial nerve
Pronator Quadratus origin and insertion
origin: Distal portion of anterior ulnar shaft; insertion: Distal surface of anterior radius
Superficial action
Action
Superficial innervation
Nerve
Flexor Digitorum Profundus origin and insertion
origin: Anteromedial surface of ulna and interosseous membrane; insertion: By four tendons into distal phalanges of fingers 2-5
Pronator Quadratus action
Pronates forearm; acts with pronator teres; also helps hold ulna and radius together
Pronator Quadratus innervation
Median nerve
Flexor Pollicis Longus origin and insertion
origin: Anterior surface of radius and interosseous membrane; insertion: Distal phalanx of thumb
Flexor Digitorum Profundus action
Slow-acting finger flexor; assists in flexing wrist; the only muscle that can flex distal interphalangeal joints
Flexor Digitorum Profundus innervation
Medial half by ulnar nerve, lateral half by median nerve
Deep origin and insertion
origin: Origin; insertion: Insertion
Flexor Pollicis Longus action
Flexes distal phalanx of thumb; weak flexor of wrist
Flexor Pollicis Longus innervation
Median nerve

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