Muscles of the Arm and Forearm Flashcards
Triceps brachii
Long head:
-Infragleniod tubercle on scapula
Medial/Lateral head:
-Posterior surface of humerus
-Olecranon
- Ext. of forearm at elbow joint
- Long head: Ext. of humerus at shoulder joint.
-Radial n. (C6-C8)
Flexor Carpi Ulnaris
- Medial epicondyle
- olecranon
- posterior ulna
- Pisiform
- Hamate
- Base of 5th MC
- Flex./Add. of wrist
- Ulnar n. (C7-T1)
Pronator teres
- medial epicondyle
- supraepicondylar ridge
- medial side of coronoid process
- Mid-shaft of humerus
- Pronation
- Median n. (C6, C7)
Flexor Carpi Radialis
- Medial epicondyle
- Base of MCs 2-3
- Flex./Abd. of wrist
- Median n. (C6-C7)
Palmaris Longus
- Medial epicondyle
- Palmar aponeurosis of hand
- Flexes wrist
- Resist sheering force when gripping
-Median n. (C7, C8)
Flexor Digitorum Superficialis
- Medial epicondyle
- coronoid process
- oblique line of radius
-MPs of fingers 2-5
- Flexion of PIP and MCP of fingers 2-5
- Flexion of wrist
-Median n. (C8, T1)
Flexor digitorum profundus
- Ulna
- Interosseous membrane
-DPs of fingers 2-5
- Flexion of DIP and MCP of fingers 2-5
- Flexion of wrist
- Lateral half: median n. (anterior interossesous n.)
- Medial half: Ulnar n. (C8, T1)
Flexor pollicis longus
- Radius
- Interosseous membrane
- Base of distal phalanx of thumb
- Flexion of IP and MCP joint of thumb
- Median n. (anterior interosseous n.) (C7,C8)
Pronator quadratus
- linear ridge on distal anterior surface of ulna
- distal anterior surface of radius
- Pronation
- Median n. (anterior interosseous n.) (C7,C8)
Brachioradialis
- Proximal part of lateral supraepicondylar ridge of humerus
- Lateral surface of distal end of radius
- Accessory flexor of elbow joint when forearm is midpronated
- Radial n. [C5,C6]
Extensor carpi radialis longus
- Proximal part of lateral supraepicondylar ridge of humerus
- Dorsal surface of base of 2nd MC
- Extension and abduction of the wrist
- Radial n. [C6,C7]
Extensor carpi radialis brevis
- Lateral epicondyle of the humerus
- Dorsal surface of base of 2nd and 3rd MCs
- Extension and abduction of the wrist
- Deep branch of radial n. [C7,C8]
Extensor digitorum
- Lateral epicondyle of the humerus
- Four tendons, which insert via ‘extensor hoods’ into the dorsal aspects digits 2-4
- Extension of digits 2-4 and wrist
- Posterior interosseous n. [C7,C8]
Extensor digiti minimi
- Lateral epicondyle of the humerus
- Extensor hood of the LF
- Extension of 5th digit
- Posterior interosseous n. [C7,C8]
Extensor carpi ulnaris
- Lateral epicondyle of humerus and ulna
- Base of 5th MC
- Extension and adduction of wrist
- Posterior interosseous n. [C7,C8]
Supinator
- Lateral epicondyle of humerus
- Supinator crest of ulna
- Lateral surface of radius
- Supination
- Posterior interosseous n. [C6,C7]
Abductor pollicis longus
- Ulna
- radius
- interosseous membrane
- Base of 1st MC
- Abduction of CMC joint of thumb
- Posterior interosseous n. [C7,C8]
Extensor pollicis brevis
- Radius
- interosseous membrane
• Base of proximal phalanx of the thumb
- Extension of MCP and
- CMC joints of the thumb
• Posterior interosseous n. [C7,C8]
Extensor pollicis longus
- Posterior surface of ulna
- interosseous membrane
- Base of distal phalanx of thumb
- Extension of IP, CMC, and MCP joints of thumb
- Posterior interosseous n. [C7,C8]
Extensor indicis
- Posterior surface of ulna
- interosseous membrane
- Extensor hood of index finger
- Extension of index finger
- Posterior interosseous n. [C7,C8]
Anconeus
- Lateral epicondyle of the humerus
- Olecranon
• Elbow stabilization
• Accessory extensor of elbow
joint
• Radial n. [C6 to C8]
