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22 Cards in this Set

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Extensor Digitorum
Origin: Common extensor tendon from the lateral epicondyle of the humerus and deep antebrachial fascia
Insertion: By four tendons, each penetrating a membraneous expansion on the dorsum of the second through fifth digits and dividing over the proximal phalanx into a medial and two lateral bands. The medial band inserts into the base of the middle phalanx; the lateral bands reunite over the middle phalanx and insert into the base of the distal phalanx.
A: Extends the metacarpophalangeal joints, and in conjunction with the lumbricales and interossei, extends the interphalangeal joints of the second through fifth digits. Assists in abduction of the index, ring, and little fingers and in extension and abduction of the wrist.
N: Radial, C6,7,8
Extensor Digiti Minimi
O: Common extensor tendon from the lateral epicondyle of the humerus and deep antebrachial fascia
I: Into extensor expansion of the little finger with the extensor digitorum tendon
A: Extends the metacarpophalangeal joint, and in conjunction with the lumbricalis and interosseous, extends the interphalangeal joints of the little finger. Assists in abduction of the little finger.
N: Radial, C7,8
Extensor Indicis
O: Posterior surface of the body of the ulna distal to the origin of the extensor pollicis longus, and interosseous membrane
I: Into extensor expansion of the index finger with the extensor digitorum longus tendon
A: Extends the matacarpophalangeal joint, and in conjunction with the lumbricalis and interossei,extends the interphalangeal joints of the index finger. May assist in adduction of the index finger.
Nerve: Radial, C7,8
Flexor Digitorum Superficialis
O of humeral head: Common flexor tendon from the medial epicondyle of the humerus, ulnar collateral ligament of the elbow joint, and deep antebrachial fascia
O of the ulnar head: Medial side of the coronoid process
O of radial head: Oblique line of the radius
I: By four tendons into the sides of the middle phalanges of the second through fifth digits
A Flexes the proximal interphalangeal joints of the second through fifth digits, and assists in flexion of the metacarpophalangeal joints and in flexion of the wrist
N: Medial C7,8, T1
Flexor Digitorum Profundus
O: Anterior and medial surfaces of the proximal 3/4 of the ulna, interosseous membrane and deep antebrachial fascia
I: By four tendons into the bases of the distal phalanges, anterior surface
A; Flexes the distal interphalangeal joints of the index, middle, ring, and little fingers, and assists in flexion of the proximal interphalangeal and metacarpophalangeal joints. May assist in flexion of the wrist.
N: First and second: Median C8,T1
Third and fourth: C8,T1
Flexor Carpi Radialis
O: Common flexor tendon from the medial epicondyle of the humerus and deep antebrachial fascia
I: base of the second metacarpal bone and a slip to the base of the third metacarpal bone
A: Flexes, abducts the wrist, and may assist in pronation of the forearm and in flexion of the elbow
Flexor Carpi Ulnaris
O of humeral head: Common flexor tendon from the medial epicondyle of the humerus
O of ulnar head: By aponeurosis from the medial margin of the olecranon, proximal 2/3 of the posterior border of the ulna and from the deep antebrachial fascia
I: Pisiform bone and, by ligaments, to the hamate and fifth metacarpal bones
A: Flexes and adducts the wrist, and may assist in flexion of the elbow
N: Ulnar, C8
Extensor Carpi Radialis Longus
O: Distal 1/3 of the lateral supracondylar ridge of the humerus and lateral intermuscular septum
I: Dorsal surface of the base of the second metacarpal bone, radial side
A: Extends and abducts the wrist, and assists in flexion of the elbow
N: Radial, C6,7
Extensor Carpi Radialis Brevis
O: Common extensor tendon from the lateral epicondyle of the humerus, radial collateral ligament of elbow joint, and deep antebrachial fascia
I: Dorsal surface of the base of the third metacarpal bone
A: Extends and assists in abduction of the wrist
N: Radial, C6,7
Extensor Pollicis Brevis
O: Posterior surface of the body of radius distal to origin of abductor pollicis longus, and to the interosseous membrane
I: Base of the proximal phalanx of the thumb, dorsal surface
A: Extends the metacapophalangeal joint of the thumb, and extends and abducts the carpometacarpal joint. Also assits in abduction (radial deviation) of the wrist
N: Radial C7,8
Flexor Pollicis Longus
O: Anterior surface of the body of the radius below the tuberosity, interroseous membrane, medial border of the coronoid process of the ulna, and/or the medial epicondyle of the humerus
I: Base of the distal phalanx of the thumb, palmar surface
A: Flexes the interphalangeal joint of the thumb. Assists in flexion of the metacarpophalangeal and carpometacarpal joints, and may assist in flexion of the wrist
N: Median, C8,T1
Adductor Pollicis
O of oblique fibers: Capitate bone and bases of the second and third metacarpal bones
O of transverse fibers: Palmar surface of the third metacarpal bone
I: Transverse head into ulnar side of base of the proximal phalanx of the thumb and oblique head into extensor expansion
A: Adducts the carpometacarpal joint, and both adducts and assists in flexion of the metacarpophalangeal joint, so that the thumb moves toward the plane of the palm. Aids in opposition of the thumb toward the little finger. By virtue of the attachment of the oblique fibers into the extensor expansion, may assist in extending the interphalangeal joint.
N: C8, T1
Abductor Pollicis Brevis
O: Flexor retinaculum, tubercle of the trapezium bone and tubercle of the scaphoid bone
I: Base of the proximal phalanx of the thumb, radial side and extensor expansion
A: Abducts the carpometacarpal and metacarpophalangeal joints of the thumb in a ventral direction perpendicular to the plane of the palm. By virtue of its attachment into the dorsal extensor expansion, extends the interphalangeal joint of the thumb. Assists in opposition, and may assist in flexion and medial rotation, of the metacarpophalangeal joint
N: Median
Opponens Pollicis
O: Flexor retinaculum and tubercle of the trapezium bone
I: Entire length of the first metacarpal bone, radial side
A: Opposes (ie, flexes and abducts with slight medial rotation) the carpometacarpal joint of the thumb, placing the thumb in a position so that, by flexion of the metacarpophalangeal joint, it can oppose the fingers. For true opposition of the thumb and little finger, the pads of these digits come in contact. Bringing the tips of these digits together can be done without action of the opponens
N: Median
Abductor Digiti Minimi
O: Tnedon of the flexor carpi ulnaris and the pisiform bone
I: By two slips: one into the base of the proximal phalanx of the little finger, ulnar side and one into the ulnar border of the extensor expansion
A: Abducts, assists in opposition, and may assist in flexion of the metacarpophalangeal joint of the little finger. By virtue of its insertion into the extensor expansion, may assist in extension of the interphalangeal joints
N: Ulnar, C8,T1
Flexor Digiti Minimi
O: Hook of the hamate bone and the flexor retinaculum
I: Base of the proximal phalanx of the little finger, ulnar side
A: Flexes the metacarpophalangeal joint of the little finger, and assists in opposition of the little finger toward the thumb
N: Ulnar C8,T1
Abductor Pollicis Longus
O: Posterior surface of the body of the ulna distal to origin of the supinator, interosseous membrane, and posterior surface of the middle 1/3 of the body of the radius
I: Base of the first metacarpal bone, radial side
A: Abducts and extends the carpometacarpal joint of the thumb, and abducts (radial deviation) and assists in flexing the wrist
N: Radial C7,8
Extensor Pollicis Longus
O: Middle 1/3 of the posterior surface of the ulna distal to origin of the abductor pollicis longus, and to the interosseous membrane
I: Base of the distal phalanx of the thumb, dorsal surface
A: Extends the interphalangeal joint, and assists in extension of the metacarpophalangeal and carpometacarpal joints of the thumb. Assists in abduction and extension of the wrist.
N: Radial C7,8
Extensor Carpi Ulnaris
O: Common extensor tendon from the lateral epicondyle of the humerus, by the aponeurosis from the posterior border of the ulna and deep antebrachial fascia
I: Base of the fifth metacarpal bone, ulnar side
A: Extends and adducts the wrist
N: Radial C7,8
Lumbricales
O: First and second: Radial surface of the flexor profundus tendons of the index and middle fingers, respectively
Third: Adjacent sides of the flexor profundus tendons of the middle and ring fingers
Fourth: Adjacent sides of the flexor profundus tendons of the ring and little finger
I: Into the radial border of the extensor expansion on the dorsum of the respective digits
A: Extend the interphalangeal joints and simultaneously flex the metacarpophalangeal joints of the second through fifth digits. The lumbricales also extend the interphalangeal joints when the metacarpophalangeal joints are extended. As the fingers are extended at all joints, the flexor digitorum profundus tendons offer a form of passive resistance to this movement. Because the lumbricales are attached to the flexor profundus tendons, they can diminish this resistive tension by contracting and pulling these tendons distally, and this release of tension decreases the contractile force needed by the muscles that extend the finger joint.
N: First and second: Median C8,T1
Third and fourth: Ulnar C8,T1
Dorsal Interossei
First, lateral head: Proximal 1/2 of the ulnar border of the first metacarpal bone
First, medial head: Radial border of the second metacarpal bone
Second, third, and fourth: Adjacent sides of the metacarpal bones in each interspace
Insertions: Into extensor expansion and to the base of the proximal phalanx as follow:
First: Radial side of the index finger, chiefly to the base of the proximal phalanx
Second: Radial side of the middle finger
Third: Ulnar side of the middle finger, chiefly into extensor expansion
Fourth: Ulnar side of the ring finger
A: Abducts the index, middle, and ring fingers from the axial line through the third digit. Assists in flexion of the metacarpophalangeal joints and extension of the interphalangeal joints of the same fingers. The first assists in adduction of the thumb.
N: Ulnar C8,T1
Palmar Interossei
Origins:
First: Base of the first metacarpal bone, ulnar side
Second: Length of the second metacarpal bone, ulnar side
Third: Length of the fourth metacarpal bone, radial side
Fourth: Length of the fifth metacarpal bone, radial side
Insertions: Chiefly into extensor expansion of the respective digit, with possible attachment to the base of the proximal phalanx as follows:
First: Ulnar side of the thumb
Second: Ulnar side of the index finger
Third: Radial side of the ring finger
Fourth: Radial side of the little finger
Action: Adduct the thumb, index, ring, and little finger toward the axial line through the third digit. Assist in flexion of the metacarpophalangeal joints and extension of the interphalangeal joints of the three fingers.
N: Ulnar C8,T1