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24 Cards in this Set
- Front
- Back
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MUSCLES OF HUMERUS ACTING ON FOREARM (4)
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1~Triceps brachii
2~Biceps brachii 3~Brachioradialis 4~Brachialis |
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TRICEPS BRACHII
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ORIGIN: Long head-Inferior margin of glenoid cavity; Lateral head posterior humerus; Medial head-Distal radial groove on posterior humerus
INSERTION: Olecranon process of ulna ACTION: Powerful forearm extensor; Antagonist of forearm flexors(Brachialis & Biceps Brachii) |
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BICEPS BRACHII
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ORIGIN: Short head-Coracoid process; tendon of long head runs in intertubercular groove & within capsule of shoulder joint
INSERTION: Radial tuberosity ACTION: Powerful flexion of elbow & supination of forearm; "It turns the corkscrew & pulls the cork"; Weak arm flexor |
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BRACHIORADIALIS
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ORIGIN: Lateral ridge at distal end of humerus
INSERTION: Base of styloid process of radius ACTION: Synergist in forearm flexion |
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BRACHIALIS
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ORIGIN: Distal portion of anterior humerus
INSERTION: Coronoid process of ulna ACTION: A major flexor of forearm |
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Muscles of forearm acting on hands & fingers: (6) ANTERIOR COMPARTMENT (5 Superficial & 1 Deep):
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1~Superficial
1)Pronator teres 2)Flexor carpi radialis 3)Palmaris longus 4)Flexor carpi ulnaris 5)Flexor digitorum superficialis 2~Deep 1)Flexor digitorum profundus |
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PRONATOR TERES (Superficial)
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ORIGIN: Medial epicondyle of humerus & coronoid process of ulna
INSERTION: Midshaft of radius ACTION: Acts synergistically w pronator quadratus to pronate forearm; Weak elbow flexor |
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FLEXOR CARPI RADIALIS (Superficial)
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ORIGIN: Medial epicondyle of humerus
INSERTION: Base of metacarpals 2 & 3 ACTION: Powerful flexor of wrist; Abducts hand |
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PALMARIS LONGUS (Superficial)
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ORIGIN: Medial epicondyle of humerus
INSERTION: Palmar aponeurosis; Skin & fascia of palm ACTION: Flexes wrist (weak); Tenses skin & fascia of palm |
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FLEXOR CARPI ULNARIS (Superficial)
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ORIGIN: Medial epicondyle of humerus & olecranon process & posterior surface of ulna
INSERTION: Base of metacarpal 5; Pisiform & hamate bones ACTION: Powerful flexor of wrist; Adducts hand |
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FLEXOR DIGITORUM SUPERFICIALIS (Superficial)
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ORIGIN: Medial epicondyle of humerus & olecranon process & posterior surface of ulna
INSERTION: Base of metacarpal 5; Pisiform & hamate bones ACTION: Powerful flexor of wrist; Adducts hand |
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FLEXOR DIGITORUM PROFUNDUS (Deep)
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ORIGIN: Medial epicondyle of humerus, coronoid process of ulna & shaft of radius
INSERTION: Middle phalanges of fingers 2-5 ACTION: Flexes wrist & middle phalanges of fingers 2-5 |
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Muscles of forearm acting on hands & fingers: (6) POSTERIOR COMPARTMENT:
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1~Extensor carpi radialis longus
2~Extensor carpi radialis brevis 3~Extensor digitorum 4~Extensor carpi ulnaris 5~Supinator 6~Extensor pollicis brevis |
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EXTENSOR CARPI RADIALIS LONGUS
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ORIGIN: Lateral supracondylar ridge of humerus
INSERTION: Base of metacarpal 2 ACTION: Extends & abducts wrist |
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EXTENSOR CARPI RADIALIS BREVIS
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ORIGIN: Lateral epicondyle of humerus
INSERTION: Base of metacarpal 3 ACTION: Extends & abducts wrist; Steadies wrist during finger flexion |
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EXTENSOR DIGITORUM
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ORIGIN: Lateral epicondyle of humerus
INSERTION: By 4 tendons into distal phalanges of fingers 2-5 ACTION: Prime mover of finger extension; Extends wrist; Can flare/abduct fingers |
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EXTENSOR CARPI ULNARIS
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ORIGIN: Lateral epicondyle of humerus; Posterior border of ulna
INSERTION: Base of metacarpal 5 ACTION: Extends & adducts wrist |
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SUPINATOR
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ORIGIN: Lateral epicondyle of humerus; Proximal ulna
INSERTION: Proximal end of radius ACTION: Supinate forearm; Antagonist of pronator muscles |
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EXTENSOR POLLICIS BREVIS
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ORIGIN: Dorsal shaft of ulna & radius, interosseous membrane
INSERTION: Proximal phalanx of thumb ACTION: Extends thumb |
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Muscles acting on thigh & leg:
ORIGIN ON PELVIS (3) |
1~Iliacus
2~Psoas major 3~Sartorius |
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ILIACUS
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ORIGIN: Iliac fossa & crest; Lateral sacrum
INSERTION: On & just below lesser trochanter of femur ACTION: Flex trunk on thigh; Flex thigh |
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PSOAS MAJOR
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ORIGIN: Transverse processes, bodies & discs of T12 & lumbar vertebrae
INSERTION: On & just below lesser trochanter of femur ACTION:Flex trunk on thigh; Flex thigh; Lateral flexion of vertebral column |
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SARTORIUS
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ORIGIN: Anterior superior iliac spine
INSERTION: By an aponeurosis into medial aspect of proximal tibia ACTION: Flexes, abducts & laterally rotates thigh; Flexes knee; Known as "tailor's muscle" bc it helps effect cross-legged position in which tailors are often depicted |
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Muscles acting on thigh & leg:
MEDIAL COMPARTMENT (4) |
1~Adductor longus
2~Adductor magnus 3~Pectineus 4~Gracilis |
