Muscles of the arm

Question 1

Origin of biceps brachii muscle

Answer 1

• Long head – Supraglenoid tubercle of the scapula
  
  • Short head – Apex of the coracoid process

Question 2

Insertion of biceps brachii muscle

Answer 2

Radial tuberosity

Question 3

Action of biceps brachii muscle

Answer 3

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

Question 4

Innervation of biceps brachii muscle

Answer 4

Musculocutaneous nerve

Question 5

Origin of coracobrachialis muscle

Answer 5

Apex of the coracoid process

Question 6

Insertion of coracobrachialis muscle

Answer 6

Medial surface of the humerus, along the midshaft

Question 7

Action of coracobrachialis muscle

Answer 7

Weak flexor at the shoulder joint

Question 8

Innervation of coracobrachialis muscle

Answer 8

Musculocutaneous nerve

Question 9

Origin of brachialis muscle

Answer 9

Distal half of the anterior surface of the humeral shaft

Question 10

Insertion of brachialis muscle

Answer 10

Ulnar tuberosity

Question 11

Action of brachialis muscle

Answer 11

Powerful flexion of the elbow joint

Question 12

Innervation of brachialis muscle

Answer 12

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

Question 13

Origin of triceps brachii muscle

Answer 13

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

Question 14

Insertion of triceps brachii muscle

Answer 14

Margin of the olecranon via the broad tendon

Question 15

Action of triceps brachii muscle

Answer 15

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

Question 16

Innervation of triceps brachii muscle

Answer 16

Radial nerve

Question 17

Origin of pronator teres muscle

Answer 17

Medial epicondyle and coronoid process of the ulna

Question 18

Insertion of pronator teres muscle

Answer 18

Lateral aspect of the shaft of the radius

Question 19

Action of pronator teres muscle

Answer 19

Pronation

Question 20

Innervation of pronator teres muscle

Answer 20

Median nerve

Question 21

Origin of flexor carpi radialis muscle

Answer 21

Medial epicondyle of the humerus

Question 22

Insertion of flexor carpi radialis muscle

Answer 22

Base of the second and third metacarpals

Question 23

Action of flexor carpi radialis muscle

Answer 23

Flexion and abduction at the wrist joint

Question 24

Innervation of flexor carpi radialis muscle

Answer 24

Median nerve

Question 25

Origin of palmaris longus muscle

Answer 25

Medial epicondyle of the humerus

Question 26

Insertion of palmaris longus muscle

Answer 26

Palmar aponeurosis and distal half of the flexor retinaculum

Question 27

Action of palmaris longus muscle

Answer 27

Tenses palmar aponeurosis and flexes the wrist

Question 28

Innervation of palmaris longus muscle

Answer 28

Median nerve

Question 29

Origin of flexor carpi ulnaris muscle

Answer 29

Medial epicondyle and posterior border of ulna

Question 30

Insertion of flexor carpi ulnaris muscle

Answer 30

Pisiform, hook of hamate and the base of the 5th metacarpal

Question 31

Action of flexor carpi ulnaris muscle

Answer 31

Flexion and adduction of the wrist joint

Question 32

Innervation of flexor carpi ulnaris muscle

Answer 32

Ulnar nerve

Question 33

Origin of flexor digitorum superficialis muscle

Answer 33

• Medial epicondyle and coronoid process of the humerus
  
  • Anterior surface of the radius

Question 34

Insertion of flexor digitorum superficialis muscle

Answer 34

Palmar surface of the shaft of the middle phalanges of the
medial 4 digits

Question 35

Action of flexor digitorum superficialis muscle

Answer 35

• Flexion of the proximal interphalangeal joints
  
  • May assist in flexion of the wrist and metacarpophalangeal
    joints