Muscles of the arm

Question 1

Origins of biceps brachii

Answer 1

Long head originates from supraglenoid fossa of scapula

Short head originates from coracoid process of scapula

Question 2

What are the muscles of the arm

Answer 2

Biceps brachii,
Brachialis,
Coracobrachialis,
Triceps brachii

Question 3

Attachment of biceps brachii

Answer 3

Radial tuberosity

Question 4

Action of biceps brachii

Answer 4

Mainly supination of forearm

Flexion at elbow and shoulder

Question 5

What is nervous and arterial supply to BBC muscles

Answer 5

Musculocutaneous nerve

Brachial artery

Question 6

Action of brachialis

Answer 6

Flexion at elbow

Question 7

Origin of brachialis

Answer 7

Medial and lateral surfaces of humeral shaft

Question 8

Attachment of brachialis

Answer 8

Ulnar tuberosity (just distal to elbow)

Question 9

Origin of coracobrachialis

Answer 9

Coracoid process of scapula

Question 10

Attachment of coracobrachialis

Answer 10

Medial surface of humeral shaft at the level of the deltoid tubercle

Question 11

Action of coracobrachialis

Answer 11

Flexion of arm at shoulder

Question 12

Origins of triceps brachii

Answer 12

Long head originates from infraglenoid tubercle
Medial head originates from humerus (inferior to radial groove)
Lateral head originates from humerus (superior to radial groove)

Question 13

Attachment of triceps brachii

Answer 13

Olecranon of ulna

Question 14

Action of triceps brachii

Answer 14

Extension of arm at elbow

Question 15

Innervation of triceps brachii

Answer 15

Radial nerve

Question 16

Which biceps brachii tendon is most likely to rupture

Answer 16

Long head tendon

Question 17

Why don’t you notice much upper limb weakness in biceps tendon rupture?

Answer 17

Action of brachialis and supinator muscles