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14 Cards in this Set

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  • Back
Coracobrachialis
Origin: coracoid process of the scapula
Insertion: medial shaft of the humerus at about its middle
Action:
flexes the humerus
assists to adduct the humerus
Biceps brachii
Origin:
long head- supraglenoid tubercle and glenohumeral labrum
short head- tip of the coracoid process of the scapula
Insertion:
radial tuberosity
bicipital aponeurosis
Action:
flexes the forearm at the elbow (when supinated)
supinates forearm from neutral
stabilizes anterior aspect of shoulder
flexes shoulder (weak if at all)
Brachialis
Origin:
lower 1/2 of anterior humerus
both intermuscular septa
Insertion:
ulnar tuberosity
coronoid process of ulna slightly
Action: elbow flexion (major mover)
Triceps brachii
Origin:
long head - infraglenoid tubercle of the scapula
lateral head - upper half of the posterior surface of the shaft of the humerus, and the upper part of the lateral intermuscular septum
medial head - posterior shaft of humerus, distal to radial groove and both the medial and lateral intermuscular septum (deep to the long & lateral heads)
Insertion:
posterior surface of the olecranon process of the ulna
deep fascia of the antebrachium
Action:
long - adducts the arm, extends at the shoulder, and a little elbow flexion
lateral - extends the forearm at the elbow
medial - extends the forearm at the elbow
Pronator teres
Origin:
humeral head:
upper portion of medial epicondyle via the CFT (common flexor tendon)
medial brachial intermuscular septum
ulnar head - coronoid process of ulna
antebrachial fascia
Insertion: lateral aspect of radius at the middle of the shaft (pronator tuberosity)
Action:
pronates forearm (during rapid or forced pronation)
weakly flexes the elbow
Flexor carpi radialis
Origin:
medial epicondyle via the CFT (common flexor tendon)
antebrachial fascia
Insertion: base of the 2nd and sometimes 3rd metacarpals
Action:
flexes the hand at the wrist
radially deviates the wrist
may assist to pronate the forearm
Flexor carpi ulnaris
Origin:
humeral head - medial epicondyle via the CFT (common flexor tendon)
ulnar head:
medial aspect of olecranon
proximal 3/5 of dorsal ulnar shaft
antebrachial fascia
Insertion:
pisiform & hamate bones (via the pisohamate ligament)
base of the 5th metacarpal (via the pisometacarpal ligament)
Action:
flexes the hand at the wrist
ulnarly deviates the wrist
stabilizes wrist to permit powerful thumb motion
Flexor digitorum profundus
Origin:
anterior & medial surface of upper 3/4 ulna
adjacent interosseous membrane
Insertion: distal phalanx of medial 4 digits (through FDS tunnel)
Action:
flexes the distal IP joints and in so doing flexes the proximal and middle IP joints
flexes the wrist if fingers are extended
Flexor pollicis longus
Origin:
middle anterior surface of the radius
interosseous membrane
(may also originate from lateral boarder of coronoid process
or medial epicondyle)
Insertion: palmar aspect of base of the distal phalanx of thumb (deep to flexor retinaculum)
Action:
flexes the distal phalanx of the thumb (IP joint)
flexes the other joints to the wrist (McP, CMc and weakly at the wrist)
Pronator quadratus
Origin: distal 1/4 anteriomedial surface of ulna
Insertion: distal 1/4 anteriolateral surface of radius
Action: pronates the forearm and hand
Brachioradialis
Origin:
upper lateral supracondylar ridge of humerus (between the triceps and brachialis muscles)
lateral intermuscular septum of humerus
Insertion:
superior aspect of styloid process of radius
lateral side of the distal 1/2 to 1/3 of the radius
antebrachial fascia
Action:
flexes the forearm at the elbow
pronates the forearm when supinated
supinates the forearm when pronated
Extensor digitorum
Origin:
lateral epicondyle via the CET (common extensor tendon)
antebrachial fascia
Insertion:
base of middle phalanx of each of the four fingers (central band)
base of distal phalanx of each of the four fingers (2 lateral bands)
Action:
extends the four medial digits
extends the wrist if fingers flexed
abducts the digits (spreads the digits as it extends them)
Supinator
Origin:
lateral epicondyle of humerus
supinator crest of ulna
radial collateral ligament
annular ligament
antebrachial fascia
Insertion: proximal portion of anteriorlateral surface of the radius
Action: supinates the forearm
Lumbricals
Origin:
tendon of flexor digitorum profundus
1 & 2 have a single head of origin (from radial aspect of tendon)
3 & 4 have two heads of origin (each head from an adjacent tendon)
Insertion: extensor hood of digits 2-5
Action:
flexes the fingers (at the McP joints)
extend IPs