Flashcards in Muscles of the Posterior Forearm Deck (59):
1
Group of muscles that are the extensors and supinators of the wrist and hand
Muscles of the posterior forearm
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All muscles of the posterior forearm are innervated by the
Radial Nerve
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4 of the 7 superficial muscles of the posterior forearm originate where?
Common extensor tendon from the lateral epicondyle of the humerus
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The other 2 muscles of the posterior forearm originate where?
Slightly above the others on the lateral supracondylar ridge
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All extensor muscle tendons that pass to the hand are held in place by
Extensor Retinaculum
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Attaches the tendons to the phalanges on the posterior side of the fingers. A triangular hood like structure that covers the dorsal surface of each digit
Extensor expansion hood
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The 7 muscles of the superficial posterior forearm
Anconeus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum
Extensor Carpi Radialis Brevis
Extensor Carpi Radialis Longus
Brachioradialis
8
Long thin muscle partly overlapped by the brachioradialis on posterior forearm
Extensor Carpi Radialis Longus
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Where does the extensor carpi radialis insert?
Base of 2nd metacarpal
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Actions of the extensor carpi radialis
Extends and abducts the wrist (makes a fist)
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Origin of the extensor radialis longus
Lateral supracondyle ridge of the humerus
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Innervated by
Radial nerve
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Muscle that is slightly shorter than the extensor carpi radialis longus that lies deep to it
Extensor radialis brevis
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Actions of the extensor radialis brevis
Extends and abducts the wrist
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Origin of the extensor carpi radialis brevis
Lateral epicondyle of the humerus (common extensor tendon
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Insertion of the extensor carpi radialis brevis
Base of the 3rd metacarpal
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Innervated by
Radial Nerve
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The muscle that is the main extensor of the four fingers
Extensor Digitorum
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The insertion of the extensor digitorum that is a tent of connective tissue
The extensor expansion hood
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Actions of the extensor digitorum
Extends the proximal phalynx of the digits
Middle and distal phalanges are extended
Extends hand at the wrist
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Origin of the extensor digitorum
Insertion of the extensor digitorum
Nerve
Lateral epicondyle of the humerus
Extensor expansion hood
Radial nerve
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Muscle that is a thin slip partially attached to extensor digitorum that goes to the little finger
Extensor Digiti Minimi
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Actions of extensor digiti minimi
Extends proximal phalynx of fifth finger
Assists in extension of hand
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Innervated by
Radial Nerve
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Long band like muscle located along medial border of the forearm
Extensor Carpi Ulnaris
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The actions of the extensor carpi ulnaris
Extends with carpi radialis and adducts the flexor carpi radialis
-(forms fist)
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Origins of the extensor carpi ulnaris
Lateral epicondyle
Common extensor tendon
Fibers of posterior surface of the ulna
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The five deep muscles of the posterior forearm
Supinator
Abductor Pollicis Longus
Extensor Pollicis Brevis
Extensor Pollicis Longus
Extensor Indicis
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Deep muscle of the posterior forearm that wraps tightly around the upper 1/3 of the radius
Supinator
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The origins of the supinator
Lateral epicondyle of the humerus
The ulna
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Insertion of the supinator
The upper 1/3 of the radius
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action of the supinator with the biceps brachii
Rotates the radius during supination
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Muscle that is recruited when rapid forceful supination occurs
Biceps Brachii
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A triangular depression on the dorso lateral side of the hand
Anatomical Snuffbox
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Name the boundaries of the anatomical snuffbox
Tendons of the extensor pollicis longus
Extensor pollicis longus
Abductor pollicis longus
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Muscle of the posterior forearm that originates deep to the superficial extensors and is the most lateral tendon of the snuff box
Abductor pollicis longus
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Muscle that crosses the tendons of the extensor carpi radialis longus and brevis
Abductor pollicis longus
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Action of the abductor pollicis longus
Abducts and extends the thub
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Origination of abductor pollicis
Posterior radius and ulna,
Interosseous membrane
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Insertion of abductor pollicis
Base of the first metacarpal
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Innervation
Radial Nerve
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Two muscles that exit obliquely from under the superficial muscle and cross over the extensor carpi radialis muscles
Extensor pollicis longus and brevis
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Which of these two muscles is closely associated with the abductor pollicis longus?
Extensor pollicis brevis
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Which of these two muscles hooks around a tubercle on the dorsum of the radius as a pulley?
Extensor pollicis longus
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Actions of both the extensor pollices muscles
Extend the thumb
Abduct the hand
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Origin of brevis
Dorsal Radius
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Origin of longus
Ulna
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Insertion of brevis
Proximal Phalynx of thumb
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Insertion of longus
Distal phalynx of thumb
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Movement of the thumb that bends the thumb medially
Flexion
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Movement of the thumb that points the thumb laterally
Extension
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Movement of the thumb that points anteriorly
Abduction
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Movement of the thumb that brings it back posteriorly
Adduction
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The deeply placed muscle covered by the extensor digitorum and inserts into the index finger
Extensor indicis
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Origin of the extensor indicis
Posterior surface of the ulna
Interosseous membrane
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Innervation of extensor indicis
Radial nerve
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Action of extensor indicis
Extends the index finger
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Inflammation of the common extensor tendon of the lateral epicondyle of the humerus, small area of origin and many muscles create high load per unit area
Lateral epicondylitis (Tennis Elbow)
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