Muscles that move the arm

Question 1

Teres Major

Answer 1

Origin:
* Lateral border of
scapula
Distal attachment:
* Bicipital groove of
humerus
Actions:
* Medial rotation of arm
* Extension of arm

Question 2

Biceps Brachii

Answer 2

Origin:
* Long head: Supraglenoid
tubercle of scapula
* Short head: Coracoid process of scapula
Insertion:
* Radial tuberosity
Actions:
* Elbow flexion
* Elbow supination
* Flexion of the shoulder

Question 3

Triceps Brachii

Answer 3

Triceps Brachii
Origin: * 3 heads
Long: infra glenoid tubercle of scapula
Medial: posterior/medial aspect of humerus (medial/inferior to spiral line) *
Lateral: posterior/lateral aspect of
humerus (lateral/superior to spiral line)

Insertion: * Olecranon process of ulna
Actions: * Extension of elbow * Extension of arm at shoulder (Long
head only)

Question 4

Coracobrachialis

Answer 4

Origin: * Coracoid process of
scapula
Insertion: * Medial side of shaft of
humerus
Actions: * Flexion of arm at the
shoulder

Question 5

Brachialis

Answer 5

origin:
* Anterior shaft of humerus
Insertion:
* Coronoid process of ulna
* Ulnar tuberosity
Actions:
* Elbow flexion

Question 6

Brachioradialis

Answer 6

Origin:
* Shaft of humerus, just above lateral epicondyle
Insertion:
* Styloid process of radius
Action:
* Elbow flexion (in partial
supination)