muscles of arm

Question 1

3 muscles lie in anterior compartment.

Answer 1

biceps brachii muscle
coracobrachialis muscle
brachialis muscle

Question 2

primary function of anterior compartment muscles

Answer 2

at the shoulder and elbow joint, either both or only one joint

Question 3

biceps brachii muscle origin

Answer 3

long head- supraglenoid tubercle of scapula
short head-apex of coracoid process

Question 4

biceps brachii insertion

Answer 4

radial tuberosity

Question 5

biceps brachii muscle action

Answer 5

• Flexion at the elbow joint and supination in the forearm
  
  • Flexion and adduction at the shoulder

Question 6

biceps brachii innervation

Answer 6

Musculocutaneous nerve

Question 7

coracobrachialis muscle origin

Answer 7

• Apex of the coracoid process

Question 8

insertion of coracobrachialis

Answer 8

• Medial surface of the humerus, along the midshaft

Question 9

action of coracobrachialis muscle

Answer 9

• Weak flexor at the shoulder joint

Question 10

innervation of coracobrachialis

Answer 10

• Musculocutaneous nerve

Question 11

brachialis muscle origin

Answer 11

• Distal half of the anterior surface of the humeral shaft

Question 12

insertion of brachialis muscle

Answer 12

• Ulnar tuberosity

Question 13

action of brachialis muscle

Answer 13

• Powerful flexion of the elbow joint

Question 14

innervation of brachialis muscle

Answer 14

• Musculocutaneous nerve
  
  • Gets a contribution from the radial nerve laterally

Question 15

posterior compartment muscle

Answer 15

triceps brachii muscle

Question 16

primary functions of heads

Answer 16

are at the shoulder or elbow joints , either both or only one joint

Question 17

triceps brachii muscle origin

Answer 17

• Long head – Infraglenoid tubercle of the scapula
  
  • Lateral head – Posterior surface of the humeral shaft
  • Medial head – Posterior surface of the humeral shaft

Question 18

insertion of triceps brachii muscle

Answer 18

• Margin of the olecranon via the broad tendon

Question 19

triceps brachii muscle action

Answer 19

• Long head – Extension at the elbow and shoulder jo
  – Adduction at the shoulder joint
  
  • Lateral and Medial heads – Extension at the elbow joint

Question 20

innervation of triceps brachii

Answer 20

radial nerve