Muscles of the Arm (anterior and posterior)

Question 1

Coracobrachialis: origin

Answer 1

coracoid process

Question 2

Coracobrachialis: insertion

Answer 2

midshaft of anterior humerus

Question 3

Coracobrachialis: innervation

Answer 3

musculocutaneous (C5, C6, C7)

Question 4

Coracobrachialis: action

Answer 4

Flex glenohumeral joint

Question 5

Biceps brachii: origin

Answer 5

short head: coracoid process long head: supraglenoid tubercle

Question 6

Biceps brachii: insertion

Answer 6

-radial tuberosity -fascia of forearm (bicipital aponerosis)

Question 7

Biceps brachii: innervation

Answer 7

musculocutaneous (C5, C6, C7)

Question 8

Biceps brachii: action

Answer 8

-Flex elbow when supinated -Supinate forearm when elbow flexed -Weakly flex glenohumeral joint

Question 9

Brachialis: origin

Answer 9

Distal half of humerus

Question 10

Brachialis: insertion

Answer 10

ulnar tuberosity

Question 11

Brachialis: innervation

Answer 11

musculocutaneous (C5, C6, C7)

Question 12

Brachialis: action

Answer 12

Flex elbow

Question 13

Triceps brachii: origin

Answer 13

Long head: infraglenoid tubercle lateral head: posterior humerus medial head: posterior humerus

Question 14

Triceps brachii: insertion

Answer 14

olecranon process of ulna

Question 15

Triceps brachii: innervation

Answer 15

Radial (C5, C6, C7, C8, T1)

Question 16

Triceps brachii: action

Answer 16

-extend elbow joint -extend glenohumeral joint (long head)

Question 17

Anconeus: innervation

Answer 17

Radial (C5, C6, C7, C8, T1)

Question 18

Anconeus: action

Answer 18

stabilize elbow joint