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Lab Quiz 3
Extensors and Flexors of Arm
68
Medical
Graduate
06/11/2013

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Term
Abductor pollicis longus Origin
Definition
O: Radius and Ulna,  interosseus membrane
Term
Abductor pollicis longus Insertion
Definition
I: Trapezium, base of metacarpal I
Term
Abductor pollicis longus Action
Definition
A: Abducts thumb, extends at carpometacarpal  joint
Term
Abductor pollicis longus Innervation
Definition
N: Radial
Term
Anconeus Origin
Definition
O: Lateral epicondyle of humerus
Term
Anconeus Insertion
Definition
I: Olecranon of ulna laterally
Term
Anconeus Action
Definition
A: Extends elbow (synergist with Triceps brachii)
Term
Anconeus Innervation
Definition
N: Radial
Term
Extensor carpi radialis brevis Origin
Definition
O: Lateral epicondyle of humerus
Term
Extensor carpi radialis brevis Insertion
Definition
I: Metacarpal III (base)
Term
Extensor carpi radialis brevis Action
Definition
A: Extends  wrist
Term
Extensor carpi radialis brevis Innervation
Definition
N: Radial
Term
Extensor carpi radialis longus Origin
Definition
O: Lateral epicondyle of humerus
Term
Extensor carpi radialis longus Insertion
Definition
I:  Metacarpal II (base)
Term
Extensor carpi radialis longus Action
Definition
A: Extends wrist,  radial  deviation
Term
Extensor carpi radialis longus Innervation
Definition
N: Radial
Term
Extensor carpi ulnaris Origin
Definition
O: Lateral epicondyle of humerus
Term
Extensor carpi ulnaris Insertion
Definition
I: Metacarpal  V (base)
Term
Extensor carpi ulnaris Action
Definition
A: Extends  wrist,  ulnar  deviation
Term
Extensor carpi ulnaris Innervation
Definition
N: Radial
Term
Extensor digiti minimi Origin
Definition
O: Lateral epicondyle of humerus
Term
Extensor digiti minimi Insertion
Definition
I: Proximal phalanx  V
Term
Extensor digiti minimi Action
Definition
A: Extends  & abducts little finger
Term
Extensor digiti minimi Innervation
Definition
N: Radial (posterior  interosseous)
Term
Extensor digitorum Origin
Definition
O: Lateral epicondyle of humerus
Term
Extensor digitorum Insertion
Definition
I: Phalanges II – V  (middle & distal dorsal)
Term
Extensor digitorum Action
Definition
A: Extends  fingers 2- 5
Term
Extensor digitorum Innervation
Definition
N: Radial
Term
Extensor indicis Origin
Definition
O: Posterior ulna, interosseousmembrane
Term
Extensor indicis Insertion
Definition
I: Middle & Distal phalanges II
Term
Extensor indicis Action
Definition
A: Extends index  finger
Term
Extensor indicis Innervation
Definition
N: Radial  (posterior  interosseous )
Term
Extensor pollicis brevis Origin
Definition
O: Radius,  interosseus  membrane
Term
Extensor pollicis brevis Insertion
Definition
I: Proximal phalanx I
Term
Extensor pollicis brevis Action
Definition
A: Extends proximal phalanx  I
Term
Extensor pollicis brevis Innervation
Definition
N: Radial
Term
Extensor pollicis longus Origin
Definition
O: Ulna,  interosseous  membrane
Term
Extensor pollicis longus Insertion
Definition
I: Distal phalanx I
Term
Extensor pollicis longus Action
Definition
A: Extends  distal phalanx I
Term
Extensor pollicis longus Innervation
Definition
N: Radial
Term
Flexor carpi radialis Origin
Definition
O: Medial  epicondyle  of  humerus
Term
Flexor carpi radialis Insertion
Definition
I: Base of Metacarpals II and III
Term
Flexor carpi radialis Action
Definition
A: Flexion of wrist,  hand abduction
Term
Flexor carpi radialis Innervation
Definition
N: Median
Term
Flexor carpi ulnaris Origin
Definition
O: Medial  epicondyle  of  humerus
Term
Flexor carpi ulnaris Insertion
Definition
I: Pisiform,  hamate, metacarpal V
Term
Flexor carpi ulnaris Action
Definition
A: Flexes  wrist, hand adduction
Term
Flexor carpi ulnaris Innervation
Definition
N: Ulnar
Term
Flexor digitorum profundus Origin
Definition
O:  Proximal  2/3 ulna
Term
Flexor digitorum profundus Insertion
Definition
I: Distal phalanges II – V
Term
Flexor digitorum profundus Action
Definition
A:  Flexes distal interphalangeal Joints (**the only muscle that does this )
Term
Flexor digitorum profundus Innervation
Definition
N: Median & Ulnar
Term
Flexor digitorum superficialis Origin
Definition
O:  Medial epicondyle of humerus
Term
Flexor digitorum superficialis Insertion
Definition
I: Middle phalanges II – V
Term
Flexor digitorum superficialis Action
Definition
A:  Flexes  interphalangeal  joints; also involved in flexion of  wrist
Term
Flexor digitorum superficialis Innervation
Definition
N: Median
Term
Flexor pollicis longus Origin
Definition
O: Radius (middle ½)
Term
Flexor pollicis longus Insertion
Definition
I: Distal phalanx I
Term
Flexor pollicis longus Action
Definition
A: Flexes phalanges of thumb
Term
Flexor pollicis longus Innervation
Definition
N: Median
Term
Palmaris longus Origin
Definition
O: Medial  epicondyle  of  humerus
Term
Palmaris longus Insertion
Definition
I: Flexor  retinaculum  (over)
Term
Palmaris longus Action
Definition
A: Weak flexor, absent in 14%of people
Term
Palmaris longus Innervation
Definition
N: Median
Term
Triceps brachii Origin
Definition
O: long head infraglenoid tubercle of scapula; O: medial head: posterior humerus (below and medial to the radial groove); O:  lateral head: posterior humerus (above and lateral to the radial groove)
Term
Triceps brachii Insertion
Definition
I: olecranon of ulna
Term
Triceps brachii Action
Definition
A: extends elbow & shoulder joints
Term
Triceps brachii Innervation
Definition
N: Radial
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