Muscles of the Arm and Extensor Forearm Flashcards
1
Q
Biceps Brachii
A
- origin: supraglenoid tubercle (long head) and coracoid process of scapula (short head)
- insertion: radial tuberosity
- action: flexion at the elbow and supinates forearm
2
Q
Coracobrachialis
A
- origin: coracoid process of scapula
- insertion: proximal humerus
- action: flexion and adduction at shoulder
3
Q
Brachialis
A
- origin: distal humerus
- insertion: ulnar tuberosity
- action: flexion at elbow
4
Q
Triceps Brachii
A
has 3 heads-lateral, short, and long heads
- origin: posterior humerus (lateral and short head) and infraglenoid tubercle of scapula (long head)
- insertion: olecranon of ulna
- action extension at elbow
5
Q
Brachioradialis
A
origin: distal lateral humerus
- insertion: styloid process of radius
- action: flexion at elbow (with thumb up)
6
Q
Extensor Carpi Radialis Longus
A
- origin: lateral epicondyle of humerus
- insertion: base of 2nd metacarpal
- action: extension and radial deviation at wrist
7
Q
Extensor Carpi Radialis Brevis
A
- origin: lateral epicondyle of humerus
- insertion: base of 3rd metacarpal
- action: extension and radial deviation at wrist
8
Q
Extensor Digitorum
A
- origin: lateral epicondyle of humerus
- insertion: distal phalange of digits 2-5
- action: extension of wrist and digits 2-5
9
Q
Extensor Carpi Ulnaris
A
- origin: lateral epicondyle of humerus
- insertion: base of 5th metacarpal
- action: extension and ulnar deviation at wrist
10
Q
Abductor Pollicis Longus
A
- origin: ulna
- insertion: base of 1st metacarpal
- action: abducts thumb
11
Q
Extensor Pollicis Brevis
A
- origin: radius
- insertion: proximal phalanx of thumb
- action: extends thumb
12
Q
Extensor Pollicis Longus
A
- origin: ulna
- insertion: distal phalanx of thumb
- action: extends thumb
13
Q
Extensor Indicis
A
- origin: ulna
- insertion: phalanges of 2nd digit
- action: extends 2nd digit
14
Q
Supinator
A
- origin: proximal ulna
- insertion: proximal radius
- action: supinates forearm
