Muscles Of Arm

Question 0

Biceps brachii Insertion

Answer 0

Tuberosity of radius and fascia of forearm via bicipital aponeurosis

Question 1

Biceps brachii origin

Answer 1

Short head: tip of coracoid process of scapula

Long head: supraglenoid tubercle of scapula

Question 2

Biceps brachii Innervation

Answer 2

Musculocutaneous Nerve (C5, C6)

Question 3

Biceps brachii Action

Answer 3

Supinates forearm and, when it is supinated, flexes forearm
Flexes arm
Short head resists dislocation of shoulder

Question 4

Brachialis Origin

Answer 4

Distal half of anterior surface of humerus

Question 5

Brachialis Insertion

Answer 5

Coronoid process and tuberosity of ulna

Question 6

Brachialis Innervation

Answer 6

Musculocutaneous nerve (C5, C6)

Question 7

Brachialis Action

Answer 7

Flexes forearm in all positions

Question 8

Coracobrachialis Origin

Answer 8

Tip of coracoid process of scapula

Question 9

Coracobrachialis Insertion

Answer 9

Middle third of medial surface humerus

Question 10

Coracobrachialis Innervation

Answer 10

Musculocutaneous Nerve (C5, C6, C7)

Question 11

Coracobrachialis Action

Answer 11

Helps flex and adduct arm

Resists dislocation of shoulder

Question 12

Triceps brachii Origin

Answer 12

Long head: infraglenoid tubercle of scapula
Lateral head: posterior surface of humerus, superior to radial groove
Medial head: posterior surface of humerus, inferior to radial groove

Question 13

Triceps brachii Insertion

Answer 13

Proximal end of olecranon of ulna and fascia of forearm

Question 14

Triceps brachii Innervation

Answer 14

Radial Nerve (C6, C7, C8)

Question 15

Triceps brachii Action

Answer 15

Chief extensor of forearm

Long head extends arm and resists dislocation of humerus (especially important during abduction)

Question 16

Anconeus Origin

Answer 16

Lateral epicondyle of humerus

Question 17

Anconeus Insertion

Answer 17

Lateral surface of olecranon and superior part of posterior surface of ulna

Question 18

Anconeus Innervation

Answer 18

Radial nerve (C7, C8, T1)

Question 19

Anconeus Action

Answer 19

Assists triceps in extending forearm
Stabilizes elbow joint
Abducts ulna during pronation

Question 20

Cubital Fossa Boundaries

Answer 20

Superiorly: imaginary line connecting medial and lateral epicondyles
Medially: pronator teres
Laterally: brachioradialis
Floor: brachialis and supinator muscles
Roof: continuity of brachial and antebrachial (deep) fascia, reinforced by the bicipital aponeurosis, subcutaneous tissue, and skin

Question 21

Cubital Fossa Contents

Answer 21

1) Terminal part of brachial artery and the commencement of its terminal branches, the radial and ulnar arteries; brachial artery lies between biceps tendon and median nerve
2) (deep) accompanying veins of the arteries
3) biceps brachii tendon
4) median nerve
5) radial nerve, dividing into superficial and deep branches