Lecture 7: The Arm & Forearm Flashcards
Biceps Brachii long head OIA
O: supraglenoid tubercle of scapula
I: radial tuberosity
A: flexes/supinates forearm at elbow
Biceps Brachii short head OIA
O: caracoid process
I: bicipital aponeruosis & fascia of the medial forearm
A: flexes/supinates forearm at elbow
Brachialis OIA
O: body of humerus
I: ulnar tuberosity
A: flexes the forearm at the elbow
Triceps Brachii long head OIA
O: infraglenoid tubercle of the scapula
I: posterior olecranon process of the ulna
A: extends forearm at elbow, extends arm at shoulder
Triceps Brachii lateral head OIA
O: body of the humerus, superior to the radial groove
I: posterior olecranon process
A: extends the forearm at the elbow
Triceps brachii medial head OIA
O: body of the humerus, inferior to the radial groove
I: posterior olecranon process
A: extends the forearm at the elbow
flexors and pronators are found in the
anterior forearm
extensors and supinators are found in the
posterior forearm
Supination definition
palm up
Pronation definition
palm down
Supination muscles
- supinator
- biceps brachii
Pronation muscles
- pronator teres
- pronator quadratus
Pronator teres OIA
O: medial epicondyle of humerus
I: lateral surface of radius
A: pronates the forearm at elbow
Flexor carpi radialis OIA
O: medial epicondyle of humerus
I: base of the 2nd metacarpal
A: flexes hand at wrist, abducts hand at wrist
Palmaris longus OIA
O: medial epicondyle of humerus
I: palmar aponeurosis
A: flexes hand at wrist, tenses palmar aponeurosis
Flexor carpi ulnaris OIA
O: medial epicondyle of humerus, olecranon of ulna
I: base of 5th metacarpal, hamate/pisiform bones
A: flexes hand at wrist, adducts hand at wrist
Flexor digitorum superficialis OIA
O: medial epicondyle of humerus, coronoid process of ulna, upper surface of the radius
I: middle phalanges of the hand
A: flexes middle phalanges, flexes hand at wrist
Flexor digitorum profundus OIA
O: anterior surface of the ulna, interosseous membrane
I: distal phalanges of digits 2-5
A: flexes hand at wrist, flexes fingers
Brachioradialis OIA
O: lateral supracondylar ridge of the humerus
I: styloid process of the radius
A: flexes arm at the elbow, pronates arm at the elbow
Extensor carpi longus OIA
O: lateral supracondylear ridge of humerus
I: base of the 2nd metacarpal
A: extends hand at wrst, abducts hand at wrist
Extensor carpi radialis brevis OIA
O: lateral epicondyle of humerus
I: base of 3rd metacarpal
A: extends hand at wrist, abducts hand at wrist
Extensor digiti minimi OIA
O: lateral epicondyle of humerus
I: dorsal aponeurosis of 5th digit
A: extends 5th digit, contributes to extension of hand at wrist
Extensor carpi ulnaris OIA
O: lateral epicondyle of humerus, posterior surface of ulna
I: base of 5th metacarpal
A: extends hand at wrst, adducts hand at wrist
Anconeus OIA
O: lateral epicondyle of the humerus
I: olecranon of the ulna
A: extends the forearm at elbow, stablizers in pronation/supination
Supinator OIA
O: lateral epicondyle of humerus, supinator crest of ulna
I: posterior surface of radius
A: supinates forearm at elbow
Extensor Indicis OIA
O: posterior surface of ulna, interosseous membrane
I: distal aponeurosis of 2nd digit
A: extends the 2nd digit, extends hand at wrist
Coracobrachialis Action
- Flexes/Adducts arm at GHJ
- Interally rotates arm at GHJ
Teres Major Action
Internal rotation/Adduction/Extension of the arm at the GHJ
Supraspinatus Action
External rotation/Abduction of the arm at the GHJ
Infraspinatus action
external rotation of the arm at the GHJ
Teres Minor Action
external roation of the arm at the GHJ
Subscapularis Action
internal rotation of the arm at the GHJ
Rotator Cuff Muscles and combined action
- subscapularis
- supraspinatus
- infraspinatus
- teres minor
CIRCUMDUCTION
